Drinking water quality · 2023

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

126 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: 126
Over federal limit: 1
Approaching the limit: 0
Worst contaminant: Turbidity
Service area: CA
Source: Utility CCR

At or above the federal limit

Turbidity
Physical & aggregate · Reported level
0.5–16 NTU

Compliance history

Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.

Maximum contaminant level exceededHealth-based
2 violations on record · most recent Nov 2008
resolved

Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗

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, Diemer Plant +9 more Lake HavasuPlant Skinner PlantPlant Diemer PlantPlant Weymouth 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 Lake MathewsPlant Silverwood LakePlant 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 Jensen PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake MathewsPlant 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, Mills Plant, Lake Mathews +9 more Silverwood LakePlant Mills PlantPlant Lake MathewsPlant Lake PerrisPlant Weymouth PlantPlant Diemer PlantPlant Skinner PlantPlant Lake SkinnerPlant Lake HavasuPlant 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 Diamond Valley LakePlant Silverwood LakePlant

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, Diamond Valley Lake, Lake Skinner +4 more Castaic LakePlant 20% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Alachlor	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Diemer Plant, Jensen Plant +9 more Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit
Carbofuran	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Mills Plant, Weymouth Plant +9 more Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Silverwood LakePlant 0% of limit
Carbon Tetrachloride	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Chlordane	Not detected ng/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 Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit
Chlorobenzene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Chromium	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Weymouth Plant, Mills Plant +9 more Jensen PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Mills 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 Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Cis Dichloroethylene 12	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Deha	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Mills Plant, Skinner Plant +9 more Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Dehp	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Skinner Plant, Weymouth Plant +9 more Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit
Dichloroethane 12	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Dichloropropane 12	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Dinoseb	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Skinner Plant, Weymouth Plant +9 more Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit
Diquat	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Diemer Plant, Mills Plant +9 more Jensen PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Endothall	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 Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit
Endrin	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Skinner Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit
Glyphosate	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit
Heptachlor	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit
Heptachlor Epoxide	Not detected ng/LReported levelLake Skinner	None set	None detected
+By source (12)— Lake Skinner, Castaic Lake, Diemer Plant +9 more Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Hexachlorobenzene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit
Hexachlorocyclopentadiene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit
Lindane	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Silverwood LakePlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit
Methoxychlor	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit
Oxamyl	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Pcb Total	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Pentachlorophenol	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Picloram	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Styrene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Toxaphene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Trans Dichloroethylene 12	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Trichlorobenzene 124	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Twofourd	Not detected ug/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Skinner Plant, Weymouth Plant +9 more 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 Diamond Valley LakePlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit
Vinyl Chloride	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Xylenes Total	Not detected mg/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Skinner, Lake Havasu +9 more Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit

Disinfection byproducts

Contaminant	Measured	Federal limit	Status
TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.	18–34 ug/LReported levelWeymouth Effluent	None set	Within the limit
+By source (2)— Weymouth Effluent, Fm-1 Weymouth EffluentPlant 43% of limit Fm-1Plant 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-1Plant 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, Diemer Plant, Jensen Plant +9 more Lake HavasuPlant Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant

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, Lake Havasu, Lake Perris +4 more Castaic LakePlant 20% 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 Lake MathewsPlant 0% of limit
Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances.	4.4–6.1 pCi/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 Diamond Valley LakePlant Castaic 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, Diemer Plant, Jensen Plant +9 more Lake MathewsPlant Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Castaic LakePlant Lake PerrisPlant Silverwood 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 Skinner, Lake Mathews +4 more Castaic LakePlant Lake SkinnerPlant Lake MathewsPlant Lake HavasuPlant Silverwood LakePlant Lake PerrisPlant Diamond Valley LakePlant

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
FluorideA mineral often added to drinking water to help prevent tooth decay.	0.6–0.9 mg/LReported levelMills Plant	4 mg/LMCL	Within the limit
+By source (13)— Mills Plant, Diemer Plant, Skinner Plant +10 more Mills PlantPlant 23% of limit Diemer PlantPlant 20% of limit Skinner PlantPlant 20% of limit Weymouth PlantPlant 20% of limit Jensen PlantPlant 20% of limit Distribution SystemZone 20% of limit Lake HavasuPlant 10% of limit Lake MathewsPlant 10% of limit Lake SkinnerPlant 8% of limit Castaic LakePlant 8% 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 Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit
Asbestos	Not detected MFLReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Skinner, Lake Havasu +9 more Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit
Cyanide	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits.	Not detected mg/LReported levelDiamond Valley Lake	None set	None detected
+By source (9)— Diamond Valley Lake, Lake Skinner, Lake Havasu +6 more Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Weymouth EffluentPlant 0% of limit Fm-1Plant 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

Metals

Contaminant	Measured	Federal limit	Status
ArsenicA naturally occurring element that also enters water from industry and agriculture.	2 ug/LReported levelLake Havasu	None set	Within the limit
+By source (12)— Lake Havasu, Lake Mathews, Mills Plant +9 more Lake HavasuPlant 20% of limit Lake MathewsPlant 20% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood 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, Diemer Plant +9 more Lake HavasuPlant 7% of limit Lake MathewsPlant 7% of limit Diemer PlantPlant 7% of limit Weymouth PlantPlant 7% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Mills PlantPlant 0% of limit
Antimony	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Beryllium	Not detected ug/LReported levelWeymouth Plant	None set	None detected
+By source (12)— Weymouth Plant, Diemer Plant, Mills Plant +9 more Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Jensen PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Cadmium	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Skinner Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium.	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Skinner Plant, Mills Plant +9 more Diemer PlantPlant Skinner PlantPlant Mills PlantPlant Jensen PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
CopperA metal that enters water from corroding household plumbing.	Not detected mg/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Skinner Plant, Weymouth Plant +9 more Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood 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, Jensen Plant +9 more Mills PlantPlant Diemer PlantPlant Jensen PlantPlant Skinner PlantPlant Weymouth PlantPlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant Diamond Valley LakePlant
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Mills Plant, Weymouth Plant +9 more Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
MercuryA toxic metal from erosion of natural deposits and industrial runoff.	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Mills Plant, Skinner Plant +9 more Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
NickelA metal from natural deposits and industrial discharge.	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Skinner Plant, Weymouth Plant +9 more Diemer PlantPlant Skinner PlantPlant Weymouth PlantPlant Jensen PlantPlant Mills PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
SeleniumA trace element from natural deposits and industrial discharge.	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Mills Plant, Diemer Plant +9 more Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Diemer PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Strontium	Not detected pCi/LReported levelDiamond Valley Lake	None set	None detected
+By source (7)— Diamond Valley Lake, Lake Skinner, Lake Havasu +4 more Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Thallium	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Weymouth Plant, Diemer Plant +9 more Jensen PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Vanadium	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
ZincA naturally occurring metal that can also enter water from corroding pipes.	Not detected mg/LReported levelMills Plant	None set	None detected
+By source (12)— Mills Plant, Diemer Plant, Jensen Plant +9 more Mills PlantPlant Diemer PlantPlant Jensen PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Silverwood LakePlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant
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 Diemer PlantPlant Mills PlantPlant Silverwood LakePlant Lake SkinnerPlant Diamond Valley LakePlant Lake PerrisPlant Lake MathewsPlant Lake HavasuPlant
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 Mills PlantPlant Skinner PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake MathewsPlant Silverwood 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 Jensen PlantPlant Mills 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 Skinner PlantPlant Lake SkinnerPlant Jensen PlantPlant Castaic LakePlant Mills PlantPlant Diamond Valley LakePlant Silverwood LakePlant Lake PerrisPlant
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, Lake Skinner, Lake Havasu +9 more Silverwood LakePlant Lake SkinnerPlant Lake HavasuPlant Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Lake PerrisPlant Diamond Valley LakePlant Lake MathewsPlant Castaic LakePlant
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

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 levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound.	Not detected ng/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Skinner, Lake Havasu +9 more Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound.	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound.	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound.	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
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, Lake Skinner, Lake Havasu +4 more Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	500 ng/LNL	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
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, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	3 ng/LNL	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	1 ng/LNL	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Skinner, Lake Havasu +9 more Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit
Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.'	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.	Not detected ng/LReported levelDiemer Plant	5.1 ng/LNL	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.	Not detected ng/LReported levelDiemer Plant	6.5 ng/LNL	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 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, Diemer Plant, Jensen Plant +9 more Lake HavasuPlant Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant

VOCs & pesticides

Contaminant	Measured	Federal limit	Status
1,2,3-TCP	Not detected ng/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Mills Plant, Skinner Plant +9 more Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Diemer PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Lake PerrisPlant Silverwood LakePlant Castaic LakePlant
AtrazineA widely used agricultural herbicide that reaches water through runoff.	Not detected ug/LReported levelJensen Plant	None set	None detected
+By source (12)— Jensen Plant, Skinner Plant, Weymouth Plant +9 more Jensen PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diemer PlantPlant 0% of limit Mills PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit
Benzene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Benzo(a)pyrene	Not detected ng/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Lake MathewsPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit
Dalapon	Not detected ug/LReported levelDiemer Plant	200 ug/LMCL	None detected
+By source (12)— Diemer Plant, Lake Mathews, Castaic Lake +9 more Diemer PlantPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit
DBCP1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide.	Not detected ng/LReported levelWeymouth Plant	None set	None detected
+By source (12)— Weymouth Plant, Skinner Plant, Diemer Plant +9 more Weymouth PlantPlant 0% of limit Skinner PlantPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake MathewsPlant 0% of limit Lake HavasuPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Dichlorodifluoromethane	Not detected ug/LReported levelDiamond Valley Lake	None set	None detected
+By source (7)— Diamond Valley Lake, Lake Skinner, Lake Havasu +4 more Diamond Valley LakePlant Lake SkinnerPlant Lake HavasuPlant Lake MathewsPlant Castaic LakePlant Lake PerrisPlant Silverwood LakePlant
Dichloromethane	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Ethylbenzene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
Ethylene dibromide	Not detected ng/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Mathews, Castaic Lake +9 more Diamond Valley LakePlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Silverwood LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake PerrisPlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit
MTBE	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant Jensen PlantPlant Mills PlantPlant Skinner PlantPlant Weymouth PlantPlant Diamond Valley LakePlant Castaic LakePlant Lake MathewsPlant Lake PerrisPlant Lake SkinnerPlant Lake HavasuPlant Silverwood LakePlant
Simazine	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing.	Not detected ug/LReported levelDiemer Plant	5 ug/LMCL	None detected
+By source (12)— Diemer Plant, Diamond Valley Lake, Lake Skinner +9 more Diemer PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit
Toluene	Not detected ug/LReported levelDiemer Plant	None set	None detected
+By source (12)— Diemer Plant, Jensen Plant, Mills Plant +9 more Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit
TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing.	Not detected ug/LReported levelDiamond Valley Lake	None set	None detected
+By source (12)— Diamond Valley Lake, Lake Skinner, Lake Havasu +9 more Diamond Valley LakePlant 0% of limit Lake SkinnerPlant 0% of limit Lake HavasuPlant 0% of limit Lake MathewsPlant 0% of limit Castaic LakePlant 0% of limit Lake PerrisPlant 0% of limit Silverwood LakePlant 0% of limit Diemer PlantPlant 0% of limit Jensen PlantPlant 0% of limit Mills PlantPlant 0% of limit Skinner PlantPlant 0% of limit Weymouth PlantPlant 0% of limit

Microbial

Contaminant	Measured	Federal limit	Status
Cryptosporidium	0–2Reported levelMills Plant	None set	Detected — no federal limit
+By source (7)— Weymouth Plant, Mills Plant, Diemer Plant +4 more Weymouth PlantPlant Mills PlantPlant Diemer PlantPlant Weymouth EffluentPlant Fm-1Plant Jensen PlantPlant Skinner PlantPlant
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 Jensen PlantPlant Mills 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 Weymouth EffluentPlant Fm-1Plant Skinner PlantPlant Jensen PlantPlant
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 Weymouth EffluentPlant Distribution SystemZone 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.