What's in Foothill Municipal Water Dist. — La Canada Flintridge, Ca, CA tap water

128 contaminants were measured in the Foothill Municipal Water Dist. — La Canada Flintridge, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.

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Reporting year: 2023
Contaminants measured: 128
Over federal limit: 1
Approaching the limit: 1
Worst contaminant: Turbidity
Service area: CA
Source: Utility CCR

At or above the federal limit

Turbidity
Physical & aggregate · Reported level
0.5–16 NTU

Approaching the limit (≥ 80%)

TTHM
Disinfection byproducts
18–74 ug/L
93% of the limit

Physical & aggregate

Contaminant	Measured	Federal limit	Status
TurbidityA measure of cloudiness from suspended particles in the water.	0.5–16 NTUReported levelJensen Plant	None set	At or above the limit
+By source (13)— Jensen Plant, Mills Plant, Weymouth Plant +10 more Jensen PlantPlant 1600% of limit Mills PlantPlant 610% of limit Weymouth PlantPlant 540% of limit Diemer PlantPlant 450% of limit Skinner PlantPlant 320% of limit Castaic LakePlant 240% of limit Lake SkinnerPlant 220% of limit Silverwood LakePlant 160% of limit Lake MathewsPlant 130% of limit Lake PerrisPlant 90% of limit Diamond Valley LakePlant 80% of limit Lake HavasuPlant 60% of limit Weymouth EffluentPlant 6% of limit
AlkalinityA measure of the water's capacity to neutralize acids.	133–137 mg/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (12)— Lake Havasu, Skinner Plant, Weymouth Plant +9 more Lake HavasuPlant Skinner PlantPlant Weymouth PlantPlant Diemer PlantPlant Lake MathewsPlant Lake SkinnerPlant Lake PerrisPlant Jensen PlantPlant Castaic LakePlant Diamond Valley LakePlant Mills PlantPlant Silverwood LakePlant
ColorA measure of visible tint in the water.	5–15Reported levelSilverwood Lake	None set	Detected — no federal limit
+By source (7)— Silverwood Lake, Lake Skinner, Castaic Lake +4 more Silverwood LakePlant Lake SkinnerPlant Castaic LakePlant Diamond Valley LakePlant Lake HavasuPlant Lake PerrisPlant Lake MathewsPlant
HardnessA measure of dissolved calcium and magnesium minerals.	293–319 mg/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (12)— Lake Havasu, Skinner Plant, Diemer Plant +9 more Lake HavasuPlant Skinner PlantPlant Diemer PlantPlant Weymouth PlantPlant Lake MathewsPlant Lake SkinnerPlant Jensen PlantPlant Castaic LakePlant Lake PerrisPlant Diamond Valley LakePlant Silverwood LakePlant Mills PlantPlant
OdorA measure of detectable smell in the water.	9Reported levelLake Skinner	None set	Detected — no federal limit
+By source (7)— Lake Skinner, Diamond Valley Lake, Lake Havasu +4 more Lake SkinnerPlant Diamond Valley LakePlant Lake HavasuPlant Lake PerrisPlant Silverwood LakePlant Lake MathewsPlant Castaic LakePlant
pHA measure of how acidic or basic the water is.	8.7–8.8Reported levelMills Plant	None set	Detected — no federal limit
+By source (12)— Mills Plant, Skinner Plant, Diemer Plant +9 more Mills PlantPlant Skinner PlantPlant Diemer PlantPlant Lake SkinnerPlant Weymouth PlantPlant Jensen PlantPlant Lake MathewsPlant Diamond Valley LakePlant Lake HavasuPlant Lake PerrisPlant Silverwood LakePlant Castaic LakePlant
Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content.	667–1080Reported levelDiemer Plant	None set	Detected — no federal limit
+By source (12)— Diemer Plant, Weymouth Plant, Lake Havasu +9 more Diemer PlantPlant Weymouth PlantPlant Lake HavasuPlant Skinner PlantPlant Lake MathewsPlant Lake SkinnerPlant Lake PerrisPlant Jensen PlantPlant Castaic LakePlant Mills PlantPlant Diamond Valley LakePlant Silverwood LakePlant
TOCTotal organic carbon — a measure of organic material dissolved in the water.	2.8–4.4 mg/LReported levelSilverwood Lake	None set	Detected — no federal limit
+By source (12)— Silverwood Lake, Lake Mathews, Mills Plant +9 more Silverwood LakePlant Lake MathewsPlant Mills PlantPlant Lake PerrisPlant Weymouth PlantPlant Skinner PlantPlant Diemer PlantPlant Lake HavasuPlant Lake SkinnerPlant Jensen PlantPlant Castaic LakePlant Diamond Valley LakePlant
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.	663–696 mg/LReported levelLake Mathews	None set	Detected — no federal limit
+By source (12)— Lake Mathews, Lake Havasu, Diemer Plant +9 more Lake MathewsPlant Lake HavasuPlant Diemer PlantPlant Weymouth PlantPlant Skinner PlantPlant Lake SkinnerPlant Jensen PlantPlant Castaic LakePlant Lake PerrisPlant Mills PlantPlant Silverwood LakePlant Diamond Valley LakePlant

Disinfection byproducts

Contaminant	Measured	Federal limit	Status
TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.	18–74 ug/LReported levelWeymouth Effluent	None set	Approaching the limit
+By source (2)— Weymouth Effluent, Fm-1 Weymouth EffluentPlant 93% of limit Fm-1Zone 38% of limit
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.	0–8.9 ug/LReported levelWeymouth Effluent	None set	Within the limit
+By source (2)— Weymouth Effluent, Fm-1 Weymouth EffluentPlant 15% of limit Fm-1Zone 11% of limit
PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection.	1.8 ug/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (12)— Lake Havasu, Skinner Plant, Diemer Plant +9 more Lake HavasuPlant Skinner PlantPlant Diemer PlantPlant Mills PlantPlant Diamond Valley LakePlant Weymouth PlantPlant Silverwood LakePlant Jensen PlantPlant Lake PerrisPlant Lake MathewsPlant Castaic LakePlant Lake SkinnerPlant

Other

Contaminant	Measured	Federal limit	Status
Chlorine Total	2–2.7 mg/LReported levelFm-1	None set	Within the limit
Radium 226 228	0–1 pCi/LReported levelCastaic Lake	None set	Within the limit
+By source (7)— Castaic Lake, Lake Skinner, Lake Havasu +4 more Castaic LakePlant 20% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Alachlor	Not detected ug/LReported levelLake Mathews	None set	None detected
+By source (12)— Lake Mathews, Weymouth Plant, Diamond Valley Lake +9 more Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Lake HavasuPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Carbofuran	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Lake Perris, Diemer Plant +9 more Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Lake HavasuPlant 0% of limit Weymouth PlantPlant 0% of limit
Carbon Tetrachloride	Not detected ng/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Lake Skinner, Diamond Valley Lake +9 more Castaic LakePlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Lake PerrisPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit
Chlordane	Not detected ng/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Lake Havasu, Jensen Plant +9 more Castaic LakePlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit Diemer PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Skinner PlantPlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit
Chlorobenzene	Not detected ug/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Castaic Lake, Mills Plant +9 more Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Chromium	Not detected ug/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Diamond Valley Lake, Mills Plant +9 more Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Jensen PlantPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake SkinnerPlant 0% of limit
Cis Dichloroethylene 12	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Skinner Plant, Lake Mathews +9 more Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit
Deha	Not detected ug/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Castaic Lake, Diemer Plant +9 more Silverwood LakePlant 0% of limit Castaic LakePlant 0% of limit Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit
Dehp	Not detected ug/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Weymouth Plant, Lake Perris +9 more Diamond Valley LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit Silverwood LakePlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Diemer PlantPlant 0% of limit
Dichloroethane 12	Not detected ug/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Castaic Lake, Lake Skinner +9 more Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Skinner PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit
Dichloroethylene 11	Not detected ug/LReported levelLake Mathews	None set	None detected
+By source (12)— Lake Mathews, Diamond Valley Lake, Diemer Plant +9 more Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake PerrisPlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake HavasuPlant 0% of limit
Dichloropropane 12	Not detected ug/LReported levelSkinner Plant	None set	None detected
+By source (12)— Skinner Plant, Diemer Plant, Jensen Plant +9 more Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Lake SkinnerPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit
Dinoseb	Not detected ug/LReported levelSkinner Plant	None set	None detected
+By source (12)— Skinner Plant, Jensen Plant, Lake Perris +9 more Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit
Diquat	Not detected ug/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Diamond Valley Lake, Mills Plant +9 more Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Jensen PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Lake MathewsPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit
Edb	Not detected ng/LReported levelDiemer Plant	5000000 ng/LMCL	None detected
+By source (12)— Diemer Plant, Lake Mathews, Diamond Valley Lake +9 more Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Endothall	Not detected ug/LReported levelLake Skinner	None set	None detected
+By source (12)— Lake Skinner, Lake Perris, Lake Havasu +9 more Lake SkinnerPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Castaic LakePlant 0% of limit
Endrin	Not detected ug/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Weymouth Plant, Castaic Lake +9 more Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Jensen PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake HavasuPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Skinner PlantPlant 0% of limit
Glyphosate	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Mills Plant, Silverwood Lake +9 more Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Skinner PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit
Heptachlor	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Lake Mathews, Skinner Plant +9 more Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Weymouth PlantPlant 0% of limit Mills PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit
Heptachlor Epoxide	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Lake Mathews, Lake Havasu +9 more Lake PerrisPlant 0% of limit Lake MathewsPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Lake SkinnerPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Diemer PlantPlant 0% of limit
Hexachlorobenzene	Not detected ug/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Jensen Plant, Silverwood Lake +9 more Lake PerrisPlant 0% of limit Jensen PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Skinner PlantPlant 0% of limit Lake MathewsPlant 0% of limit Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Diemer PlantPlant 0% of limit Lake HavasuPlant 0% of limit Weymouth PlantPlant 0% of limit
Hexachlorocyclopentadiene	Not detected ug/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Lake Havasu, Weymouth Plant +9 more Castaic LakePlant 0% of limit Lake HavasuPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake PerrisPlant 0% of limit Lake MathewsPlant 0% of limit Diemer PlantPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit
Lindane	Not detected ng/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Lake Skinner, Lake Perris +9 more Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake PerrisPlant 0% of limit Weymouth PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Diemer PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Skinner PlantPlant 0% of limit Mills PlantPlant 0% of limit
Methoxychlor	Not detected ug/LReported levelLake Mathews	None set	None detected
+By source (12)— Lake Mathews, Lake Perris, Castaic Lake +9 more Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Skinner PlantPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit
Oxamyl	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Lake Mathews, Lake Perris +9 more Jensen PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Diamond Valley LakePlant 0% of limit Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Castaic LakePlant 0% of limit Skinner PlantPlant 0% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit
Pcb Total	Not detected ng/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Mathews, Weymouth Plant +9 more Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Lake SkinnerPlant 0% of limit Skinner PlantPlant 0% of limit
Pentachlorophenol	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Lake Havasu, Castaic Lake +9 more Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit
Picloram	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Diamond Valley Lake, Diemer Plant +9 more Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Diemer PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit
Styrene	Not detected ug/LReported levelLake Mathews	None set	None detected
+By source (12)— Lake Mathews, Weymouth Plant, Skinner Plant +9 more Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit Jensen PlantPlant 0% of limit
Toxaphene	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Lake Skinner, Lake Havasu +9 more Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Skinner PlantPlant 0% of limit Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit
Trans Dichloroethylene 12	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Lake Mathews, Skinner Plant +9 more Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Jensen PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Lake PerrisPlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Diamond Valley LakePlant 0% of limit
Trichlorobenzene 124	Not detected ug/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Lake Perris, Castaic Lake +9 more Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit
Trichloroethane 111	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Weymouth Plant, Skinner Plant +9 more Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake PerrisPlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit
Twofourd	Not detected ug/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Castaic Lake, Mills Plant +9 more Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Mills PlantPlant 0% of limit Lake HavasuPlant 0% of limit Skinner PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Jensen PlantPlant 0% of limit
Vinyl Chloride	Not detected ng/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Lake Skinner, Silverwood Lake +9 more Lake HavasuPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit
Xylenes Total	Not detected mg/LReported levelSkinner Plant	10 mg/LMCL	None detected
+By source (12)— Skinner Plant, Jensen Plant, Lake Perris +9 more Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit

Radionuclides

Contaminant	Measured	Federal limit	Status
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.	0–6.2 pCi/LReported levelLake Havasu	None set	Within the limit
+By source (7)— Lake Havasu, Diamond Valley Lake, Silverwood Lake +4 more Lake HavasuPlant 41% of limit Diamond Valley LakePlant 41% of limit Silverwood LakePlant 33% of limit Lake SkinnerPlant 24% of limit Lake MathewsPlant 21% of limit Lake PerrisPlant 21% of limit Castaic LakePlant 21% of limit
Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements.	0–1 pCi/LReported levelCastaic Lake	None set	Within the limit
+By source (7)— Castaic Lake, Silverwood Lake, Diamond Valley Lake +4 more Castaic LakePlant 20% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit
Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances.	0–5.8 pCi/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (7)— Lake Havasu, Lake Mathews, Lake Skinner +4 more Lake HavasuPlant Lake MathewsPlant Lake SkinnerPlant Castaic LakePlant Diamond Valley LakePlant Lake PerrisPlant Silverwood LakePlant
RadonA naturally occurring radioactive gas that can dissolve into groundwater.	0–130 pCi/LReported levelLake Mathews	None set	Detected — no federal limit
+By source (12)— Lake Mathews, Mills Plant, Lake Havasu +9 more Lake MathewsPlant Mills PlantPlant Lake HavasuPlant Jensen PlantPlant Lake SkinnerPlant Castaic LakePlant Lake PerrisPlant Weymouth PlantPlant Silverwood LakePlant Skinner PlantPlant Diemer PlantPlant Diamond Valley LakePlant
UraniumA naturally occurring radioactive metal from erosion of natural deposits.	2.5–3.7 pCi/LReported levelCastaic Lake	None set	Detected — no federal limit
+By source (7)— Castaic Lake, Lake Mathews, Lake Skinner +4 more Castaic LakePlant Lake MathewsPlant Lake SkinnerPlant Lake HavasuPlant Silverwood LakePlant Lake PerrisPlant Diamond Valley LakePlant

Metals

Contaminant	Measured	Federal limit	Status
ArsenicA naturally occurring element that also enters water from industry and agriculture.	2 ug/LReported levelLake Mathews	None set	Within the limit
+By source (12)— Lake Mathews, Lake Havasu, Diemer Plant +9 more Lake MathewsPlant 20% of limit Lake HavasuPlant 20% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit
BariumA metal from erosion of natural deposits and industrial discharge.	143 ug/LReported levelLake Havasu	None set	Within the limit
+By source (12)— Lake Havasu, Lake Mathews, Weymouth Plant +9 more Lake HavasuPlant 7% of limit Lake MathewsPlant 7% of limit Weymouth PlantPlant 7% of limit Diemer PlantPlant 7% of limit Mills PlantPlant 0% of limit Lake PerrisPlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit
Antimony	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Skinner Plant, Lake Perris +9 more Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake PerrisPlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Silverwood LakePlant 0% of limit
Beryllium	Not detected ug/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Weymouth Plant, Mills Plant +9 more Lake HavasuPlant 0% of limit Weymouth PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Silverwood LakePlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake PerrisPlant 0% of limit
Cadmium	Not detected ug/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Skinner Plant, Diemer Plant +9 more Silverwood LakePlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit
Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium.	Not detected ug/LReported levelWeymouth Plant	None set	None detected
+By source (12)— Weymouth Plant, Jensen Plant, Skinner Plant +9 more Weymouth PlantPlant Jensen PlantPlant Skinner PlantPlant Diamond Valley LakePlant Diemer PlantPlant Mills PlantPlant Lake PerrisPlant Lake HavasuPlant Castaic LakePlant Lake MathewsPlant Silverwood LakePlant Lake SkinnerPlant
CopperA metal that enters water from corroding household plumbing.	Not detected mg/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Lake Mathews, Silverwood Lake +9 more Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Silverwood LakePlant 0% of limit Jensen PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Skinner PlantPlant 0% of limit Castaic LakePlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit
IronA naturally occurring metal common in groundwater.	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Diemer Plant, Silverwood Lake +9 more Mills PlantPlant Diemer PlantPlant Silverwood LakePlant Castaic LakePlant Lake SkinnerPlant Lake HavasuPlant Diamond Valley LakePlant Jensen PlantPlant Lake MathewsPlant Skinner PlantPlant Weymouth PlantPlant Lake PerrisPlant
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Mills Plant, Weymouth Plant +9 more Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Castaic LakePlant 0% of limit
MercuryA toxic metal from erosion of natural deposits and industrial runoff.	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Lake Skinner, Weymouth Plant +9 more Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Skinner PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit
NickelA metal from natural deposits and industrial discharge.	Not detected ug/LReported levelLake Skinner	None set	None detected
+By source (12)— Lake Skinner, Mills Plant, Skinner Plant +9 more Lake SkinnerPlant Mills PlantPlant Skinner PlantPlant Diamond Valley LakePlant Weymouth PlantPlant Silverwood LakePlant Diemer PlantPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Jensen PlantPlant Lake PerrisPlant
SeleniumA trace element from natural deposits and industrial discharge.	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Weymouth Plant, Skinner Plant +9 more Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Mills PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit
Strontium	Not detected pCi/LReported levelSilverwood Lake	None set	None detected
+By source (7)— Silverwood Lake, Lake Skinner, Castaic Lake +4 more Silverwood LakePlant Lake SkinnerPlant Castaic LakePlant Lake PerrisPlant Diamond Valley LakePlant Lake HavasuPlant Lake MathewsPlant
Thallium	Not detected ug/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Mills Plant, Weymouth Plant +9 more Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake MathewsPlant 0% of limit Skinner PlantPlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit
Vanadium	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Skinner Plant +9 more Diemer PlantPlant Jensen PlantPlant Skinner PlantPlant Lake SkinnerPlant Lake MathewsPlant Mills PlantPlant Castaic LakePlant Weymouth PlantPlant Silverwood LakePlant Diamond Valley LakePlant Lake PerrisPlant Lake HavasuPlant
ZincA naturally occurring metal that can also enter water from corroding pipes.	Not detected mg/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Mills Plant, Lake Havasu +9 more Jensen PlantPlant Mills PlantPlant Lake HavasuPlant Silverwood LakePlant Skinner PlantPlant Lake SkinnerPlant Lake PerrisPlant Diamond Valley LakePlant Weymouth PlantPlant Diemer PlantPlant Lake MathewsPlant Castaic LakePlant
AluminumA common element sometimes used as a treatment coagulant.	0–160 ug/LReported levelSkinner Plant	None set	Detected — no federal limit
+By source (12)— Skinner Plant, Weymouth Plant, Jensen Plant +9 more Skinner PlantPlant Weymouth PlantPlant Jensen PlantPlant Castaic LakePlant Mills PlantPlant Diemer PlantPlant Silverwood LakePlant Lake SkinnerPlant Diamond Valley LakePlant Lake PerrisPlant Lake HavasuPlant Lake MathewsPlant
BoronA naturally occurring element from rock and soil.	190 ug/LReported levelJensen Plant	None set	Detected — no federal limit
+By source (12)— Jensen Plant, Castaic Lake, Lake Perris +9 more Jensen PlantPlant Castaic LakePlant Lake PerrisPlant Diemer PlantPlant Weymouth PlantPlant Silverwood LakePlant Lake SkinnerPlant Skinner PlantPlant Lake MathewsPlant Mills PlantPlant Diamond Valley LakePlant Lake HavasuPlant
CalciumA naturally occurring mineral that contributes to water hardness.	76–81 mg/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (12)— Lake Havasu, Lake Mathews, Lake Skinner +9 more Lake HavasuPlant Lake MathewsPlant Lake SkinnerPlant Castaic LakePlant Lake PerrisPlant Diamond Valley LakePlant Silverwood LakePlant Weymouth PlantPlant Diemer PlantPlant Skinner PlantPlant Mills PlantPlant Jensen PlantPlant
LithiumA naturally occurring element found in some groundwater.	36–51 ug/LReported levelWeymouth Plant	None set	Detected — no federal limit
+By source (12)— Weymouth Plant, Diemer Plant, Lake Mathews +9 more Weymouth PlantPlant Diemer PlantPlant Lake MathewsPlant Lake HavasuPlant Lake SkinnerPlant Skinner PlantPlant Castaic LakePlant Jensen PlantPlant Silverwood LakePlant Mills PlantPlant Lake PerrisPlant Diamond Valley LakePlant
MagnesiumA naturally occurring mineral that contributes to water hardness.	28–29 mg/LReported levelLake Mathews	None set	Detected — no federal limit
+By source (7)— Lake Mathews, Lake Havasu, Lake Skinner +4 more Lake MathewsPlant Lake HavasuPlant Lake SkinnerPlant Castaic LakePlant Lake PerrisPlant Diamond Valley LakePlant Silverwood LakePlant
ManganeseA naturally occurring metal from soil and rock.	21 ug/LReported levelSilverwood Lake	None set	Detected — no federal limit
+By source (12)— Silverwood Lake, Weymouth Plant, Diamond Valley Lake +9 more Silverwood LakePlant Weymouth PlantPlant Diamond Valley LakePlant Lake MathewsPlant Lake PerrisPlant Jensen PlantPlant Skinner PlantPlant Castaic LakePlant Lake HavasuPlant Lake SkinnerPlant Diemer PlantPlant Mills PlantPlant
PotassiumA naturally occurring mineral from rock and soil.	5.2–5.6 mg/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (7)— Lake Havasu, Lake Mathews, Lake Skinner +4 more Lake HavasuPlant Lake MathewsPlant Lake SkinnerPlant Lake PerrisPlant Diamond Valley LakePlant Silverwood LakePlant Castaic LakePlant
SodiumA naturally occurring salt component.	104–108 mg/LReported levelLake Mathews	None set	Detected — no federal limit
+By source (7)— Lake Mathews, Lake Havasu, Lake Skinner +4 more Lake MathewsPlant Lake HavasuPlant Lake SkinnerPlant Lake PerrisPlant Silverwood LakePlant Diamond Valley LakePlant Castaic LakePlant

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
FluorideA mineral often added to drinking water to help prevent tooth decay.	0.6–0.7 mg/LReported levelDiemer Plant	4 mg/LMCL	Within the limit
+By source (13)— Weymouth Plant, Mills Plant, Diemer Plant +10 more Weymouth PlantPlant 18% of limit Mills PlantPlant 18% of limit Diemer PlantPlant 18% of limit Skinner PlantPlant 18% of limit Jensen PlantPlant 18% of limit Distribution SystemZone 18% of limit Lake MathewsPlant 8% of limit Castaic LakePlant 8% of limit Lake HavasuPlant 8% of limit Lake SkinnerPlant 5% of limit Diamond Valley LakePlant 3% of limit Lake PerrisPlant 3% of limit Silverwood LakePlant 0% of limit
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.	0.6 mg/LReported levelLake Havasu	None set	Within the limit
+By source (7)— Lake Havasu, Castaic Lake, Silverwood Lake +4 more Lake HavasuPlant 6% of limit Castaic LakePlant 5% of limit Silverwood LakePlant 5% of limit Lake PerrisPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit
Asbestos	Not detected MFLReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Mills Plant, Castaic Lake +9 more Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit
Cyanide	Not detected ug/LReported levelSkinner Plant	None set	None detected
+By source (12)— Skinner Plant, Jensen Plant, Castaic Lake +9 more Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Weymouth PlantPlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Diemer PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit
NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits.	Not detected mg/LReported levelCastaic Lake	None set	None detected
+By source (9)— Castaic Lake, Weymouth Effluent, Lake Havasu +6 more Castaic LakePlant 0% of limit Weymouth EffluentPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Fm-1Plant 0% of limit Lake MathewsPlant 0% of limit
ChlorideA naturally occurring salt compound.	108 mg/LReported levelLake Mathews	None set	Detected — no federal limit
+By source (7)— Lake Mathews, Lake Havasu, Lake Skinner +4 more Lake MathewsPlant Lake HavasuPlant Lake SkinnerPlant Lake PerrisPlant Silverwood LakePlant Diamond Valley LakePlant Castaic LakePlant
SulfateA naturally occurring mineral from rock and soil.	225–247 mg/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (7)— Lake Havasu, Lake Mathews, Lake Skinner +4 more Lake HavasuPlant Lake MathewsPlant Lake SkinnerPlant Castaic LakePlant Lake PerrisPlant Diamond Valley LakePlant Silverwood LakePlant

PFAS ("forever chemicals")

Contaminant	Measured	Federal limit	Status
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound.	Not detected ng/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Lake Perris, Lake Mathews +9 more Silverwood LakePlant Lake PerrisPlant Lake MathewsPlant Castaic LakePlant Skinner PlantPlant Lake SkinnerPlant Mills PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Diemer PlantPlant Jensen PlantPlant Lake HavasuPlant
Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound.	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Lake Skinner, Weymouth Plant +9 more Lake PerrisPlant 0% of limit Lake SkinnerPlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Silverwood LakePlant 0% of limit
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Silverwood Lake, Weymouth Plant +9 more Lake PerrisPlant Silverwood LakePlant Weymouth PlantPlant Diamond Valley LakePlant Skinner PlantPlant Lake MathewsPlant Jensen PlantPlant Castaic LakePlant Mills PlantPlant Lake SkinnerPlant Diemer PlantPlant Lake HavasuPlant
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.	Not detected ng/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Weymouth Plant, Lake Perris +9 more Castaic LakePlant Weymouth PlantPlant Lake PerrisPlant Lake MathewsPlant Silverwood LakePlant Lake SkinnerPlant Diemer PlantPlant Mills PlantPlant Skinner PlantPlant Jensen PlantPlant Diamond Valley LakePlant Lake HavasuPlant
Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound.	Not detected ng/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Jensen Plant, Lake Havasu +9 more Silverwood LakePlant Jensen PlantPlant Lake HavasuPlant Lake PerrisPlant Diemer PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Mills PlantPlant Castaic LakePlant Lake MathewsPlant Skinner PlantPlant
Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound.	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Castaic Lake, Diamond Valley Lake +9 more Lake PerrisPlant Castaic LakePlant Diamond Valley LakePlant Diemer PlantPlant Jensen PlantPlant Skinner PlantPlant Silverwood LakePlant Lake HavasuPlant Lake MathewsPlant Lake SkinnerPlant Weymouth PlantPlant Mills PlantPlant
Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound.	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Silverwood Lake, Diemer Plant +9 more Lake PerrisPlant Silverwood LakePlant Diemer PlantPlant Mills PlantPlant Castaic LakePlant Lake HavasuPlant Skinner PlantPlant Jensen PlantPlant Lake SkinnerPlant Weymouth PlantPlant Diamond Valley LakePlant Lake MathewsPlant
Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound.	Not detected ng/LReported levelDiamond Valley Lake	None set	None detected
+By source (7)— Diamond Valley Lake, Silverwood Lake, Lake Mathews +4 more Diamond Valley LakePlant Silverwood LakePlant Lake MathewsPlant Lake SkinnerPlant Lake PerrisPlant Castaic LakePlant Lake HavasuPlant
Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Lake Skinner, Diemer Plant +9 more Lake PerrisPlant Lake SkinnerPlant Diemer PlantPlant Mills PlantPlant Jensen PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Silverwood LakePlant Castaic LakePlant Skinner PlantPlant Lake MathewsPlant Lake HavasuPlant
Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Weymouth Plant, Lake Skinner +9 more Diemer PlantPlant Weymouth PlantPlant Lake SkinnerPlant Lake PerrisPlant Jensen PlantPlant Castaic LakePlant Silverwood LakePlant Skinner PlantPlant Mills PlantPlant Diamond Valley LakePlant Lake HavasuPlant Lake MathewsPlant
Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Diamond Valley Lake, Lake Skinner +9 more Diemer PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake PerrisPlant Castaic LakePlant Lake MathewsPlant Skinner PlantPlant Weymouth PlantPlant Silverwood LakePlant Mills PlantPlant Jensen PlantPlant
Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Silverwood Lake, Lake Perris +9 more Lake HavasuPlant Silverwood LakePlant Lake PerrisPlant Weymouth PlantPlant Diemer PlantPlant Lake MathewsPlant Jensen PlantPlant Skinner PlantPlant Mills PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Castaic LakePlant
Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelMills Plant	3 ng/LNL	None detected
+By source (12)— Mills Plant, Skinner Plant, Lake Skinner +9 more Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit
Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelJensen Plant	1 ng/LNL	None detected
+By source (12)— Jensen Plant, Castaic Lake, Silverwood Lake +9 more Jensen PlantPlant Castaic LakePlant Silverwood LakePlant Lake MathewsPlant Skinner PlantPlant Lake PerrisPlant Lake HavasuPlant Mills PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Weymouth PlantPlant Diemer PlantPlant
Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Diemer Plant, Skinner Plant +9 more Diamond Valley LakePlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Weymouth PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake MathewsPlant 0% of limit Mills PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake SkinnerPlant 0% of limit
Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Diemer Plant, Castaic Lake +9 more Silverwood LakePlant Diemer PlantPlant Castaic LakePlant Weymouth PlantPlant Diamond Valley LakePlant Lake HavasuPlant Jensen PlantPlant Lake PerrisPlant Lake SkinnerPlant Mills PlantPlant Lake MathewsPlant Skinner PlantPlant
Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Lake Mathews, Skinner Plant +9 more Jensen PlantPlant Lake MathewsPlant Skinner PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Mills PlantPlant Silverwood LakePlant Diemer PlantPlant Castaic LakePlant Lake PerrisPlant Lake HavasuPlant Weymouth PlantPlant
Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Jensen Plant, Lake Mathews +9 more Castaic LakePlant Jensen PlantPlant Lake MathewsPlant Diemer PlantPlant Weymouth PlantPlant Silverwood LakePlant Lake HavasuPlant Mills PlantPlant Lake PerrisPlant Skinner PlantPlant Lake SkinnerPlant Diamond Valley LakePlant
Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Lake Mathews, Silverwood Lake +9 more Lake PerrisPlant Lake MathewsPlant Silverwood LakePlant Diemer PlantPlant Diamond Valley LakePlant Jensen PlantPlant Skinner PlantPlant Lake SkinnerPlant Mills PlantPlant Lake HavasuPlant Weymouth PlantPlant Castaic LakePlant
Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Diamond Valley Lake, Lake Havasu +9 more Castaic LakePlant Diamond Valley LakePlant Lake HavasuPlant Skinner PlantPlant Diemer PlantPlant Jensen PlantPlant Weymouth PlantPlant Lake MathewsPlant Mills PlantPlant Lake PerrisPlant Lake SkinnerPlant Silverwood LakePlant
PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Diemer Plant, Lake Havasu +9 more Jensen PlantPlant Diemer PlantPlant Lake HavasuPlant Castaic LakePlant Lake PerrisPlant Diamond Valley LakePlant Weymouth PlantPlant Lake SkinnerPlant Skinner PlantPlant Lake MathewsPlant Silverwood LakePlant Mills PlantPlant
PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.	Not detected ng/LReported levelWeymouth Plant	5.1 ng/LNL	None detected
+By source (12)— Weymouth Plant, Lake Mathews, Lake Skinner +9 more Weymouth PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Castaic LakePlant 0% of limit Diemer PlantPlant 0% of limit Lake PerrisPlant 0% of limit
PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.	Not detected ng/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Lake Perris, Skinner Plant +9 more Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Diamond Valley LakePlant 0% of limit Silverwood LakePlant 0% of limit
Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.'	0–3.3 ng/LReported levelLake Havasu	None set	Detected — no federal limit
+By source (12)— Lake Havasu, Castaic Lake, Skinner Plant +9 more Lake HavasuPlant Castaic LakePlant Skinner PlantPlant Lake MathewsPlant Diamond Valley LakePlant Lake PerrisPlant Lake SkinnerPlant Weymouth PlantPlant Diemer PlantPlant Silverwood LakePlant Jensen PlantPlant Mills PlantPlant

VOCs & pesticides

Contaminant	Measured	Federal limit	Status
1,2,3-TCP	Not detected ng/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Diamond Valley Lake, Jensen Plant +9 more Mills PlantPlant Diamond Valley LakePlant Jensen PlantPlant Lake HavasuPlant Castaic LakePlant Lake MathewsPlant Lake SkinnerPlant Lake PerrisPlant Skinner PlantPlant Silverwood LakePlant Weymouth PlantPlant Diemer PlantPlant
AtrazineA widely used agricultural herbicide that reaches water through runoff.	Not detected ug/LReported levelLake Perris	None set	None detected
+By source (12)— Lake Perris, Weymouth Plant, Lake Havasu +9 more Lake PerrisPlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Jensen PlantPlant 0% of limit
Benzene	Not detected ug/LReported levelWeymouth Plant	None set	None detected
+By source (12)— Weymouth Plant, Jensen Plant, Lake Havasu +9 more Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake MathewsPlant 0% of limit Skinner PlantPlant 0% of limit
Benzo(a)pyrene	Not detected ng/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Lake Havasu, Lake Perris +9 more Mills PlantPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit
Dalapon	Not detected ug/LReported levelLake Mathews	None set	None detected
+By source (12)— Lake Mathews, Diamond Valley Lake, Castaic Lake +9 more Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit Lake PerrisPlant 0% of limit Weymouth PlantPlant 0% of limit
DBCP1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide.	Not detected ng/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Silverwood Lake, Jensen Plant +9 more Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Jensen PlantPlant 0% of limit Castaic LakePlant 0% of limit Skinner PlantPlant 0% of limit Lake PerrisPlant 0% of limit Lake SkinnerPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Diemer PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Mills PlantPlant 0% of limit
Dichlorodifluoromethane	Not detected ug/LReported levelLake Havasu	None set	None detected
+By source (7)— Lake Havasu, Diamond Valley Lake, Silverwood Lake +4 more Lake HavasuPlant Diamond Valley LakePlant Silverwood LakePlant Castaic LakePlant Lake SkinnerPlant Lake MathewsPlant Lake PerrisPlant
Dichloromethane	Not detected ug/LReported levelLake Skinner	None set	None detected
+By source (12)— Lake Skinner, Diemer Plant, Lake Havasu +9 more Lake SkinnerPlant 0% of limit Diemer PlantPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Silverwood LakePlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit
Ethylbenzene	Not detected ug/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Lake Perris, Diemer Plant +9 more Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Castaic LakePlant 0% of limit Mills PlantPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Jensen PlantPlant 0% of limit Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit
MTBE	Not detected ug/LReported levelLake Havasu	None set	None detected
+By source (12)— Lake Havasu, Jensen Plant, Skinner Plant +9 more Lake HavasuPlant Jensen PlantPlant Skinner PlantPlant Lake PerrisPlant Silverwood LakePlant Lake MathewsPlant Castaic LakePlant Lake SkinnerPlant Mills PlantPlant Diamond Valley LakePlant Diemer PlantPlant Weymouth PlantPlant
Simazine	Not detected ug/LReported levelLake Skinner	None set	None detected
+By source (12)— Lake Skinner, Mills Plant, Lake Mathews +9 more Lake SkinnerPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Jensen PlantPlant 0% of limit
TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing.	Not detected ug/LReported levelSilverwood Lake	None set	None detected
+By source (12)— Silverwood Lake, Weymouth Plant, Diamond Valley Lake +9 more Silverwood LakePlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Mills PlantPlant 0% of limit Lake PerrisPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake SkinnerPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit
Toluene	Not detected ug/LReported levelCastaic Lake	None set	None detected
+By source (12)— Castaic Lake, Lake Perris, Skinner Plant +9 more Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Skinner PlantPlant 0% of limit Lake MathewsPlant 0% of limit Jensen PlantPlant 0% of limit Lake HavasuPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit
TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing.	Not detected ug/LReported levelLake Mathews	None set	None detected
+By source (12)— Lake Mathews, Weymouth Plant, Lake Skinner +9 more Lake MathewsPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit Castaic LakePlant 0% of limit Jensen PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Skinner PlantPlant 0% of limit

Microbial

Contaminant	Measured	Federal limit	Status
Cryptosporidium	0–2Reported levelWeymouth Plant	None set	Detected — no federal limit
+By source (7)— Mills Plant, Weymouth Plant, Diemer Plant +4 more Mills PlantPlant Weymouth PlantPlant Diemer PlantPlant Skinner PlantPlant Jensen PlantPlant Weymouth EffluentPlant Fm-1Plant
Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals.	0–66Reported levelLake Perris	None set	Detected — no federal limit
+By source (13)— Lake Perris, Silverwood Lake, Lake Mathews +10 more Lake PerrisPlant Silverwood LakePlant Lake MathewsPlant Diamond Valley LakePlant Skinner PlantPlant Lake SkinnerPlant Weymouth PlantPlant Lake HavasuPlant Diemer PlantPlant Mills PlantPlant Jensen PlantPlant Fm-1Plant Weymouth EffluentPlant
Giardia lamblia	0–9Reported levelDiemer Plant	None set	Detected — no federal limit
+By source (7)— Diemer Plant, Weymouth Plant, Mills Plant +4 more Diemer PlantPlant Weymouth PlantPlant Mills PlantPlant Jensen PlantPlant Skinner PlantPlant Fm-1Plant Weymouth EffluentPlant
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.	9–110000Reported levelLake Havasu	None set	Detected — no federal limit
+By source (14)— Lake Havasu, Lake Skinner, Diamond Valley Lake +11 more Lake HavasuPlant Lake SkinnerPlant Diamond Valley LakePlant Jensen PlantPlant Lake MathewsPlant Silverwood LakePlant Weymouth PlantPlant Skinner PlantPlant Mills PlantPlant Lake PerrisPlant Diemer PlantPlant Distribution SystemZone Weymouth EffluentPlant Fm-1Plant

Source: Foothill Municipal Water Dist. — La Canada Flintridge, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.

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