What's in Vista Irrigation District — Vista, Ca, CA tap water

23 contaminants were measured in the Vista Irrigation District — Vista, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.

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Reporting year: 2023
Contaminants measured: 23
Over federal limit: 0
Approaching the limit: 3
Service area: CA
Source: Utility CCR

Approaching the limit (≥ 80%)

Other

Contaminant	Measured	Federal limit	Status
Chlorine Total	2–3.9 mg/LReported levelTwin Oaks Valley Water Treatment Plant	None set	Approaching the limit
+By source (4)— Twin Oaks Valley Water Treatment Plant, VID Distribution System, Carlsbad Desalination Plant +1 more Twin Oaks Valley Water Treatment PlantPlant 98% of limit VID Distribution SystemZone 95% of limit Carlsbad Desalination PlantPlant 88% of limit Escondido-Vista Water Treatment PlantPlant 83% 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.	15.2–72.5 ug/LReported levelVID Distribution System	None set	Approaching the limit
+By source (5)— VID Distribution System, Escondido-Vista Water Treatment Plant, Skinner Treatment Plant +2 more VID Distribution SystemZone 91% of limit Escondido-Vista Water Treatment PlantPlant 73% of limit Skinner Treatment PlantPlant 60% of limit Twin Oaks Valley Water Treatment PlantPlant 53% of limit Carlsbad Desalination PlantPlant 0% of limit
BromateA disinfection byproduct formed when bromide-containing water is treated with ozone.	0–8.5 ug/LReported levelTwin Oaks Valley Water Treatment Plant	None set	Approaching the limit
+By source (2)— Twin Oaks Valley Water Treatment Plant, Skinner Treatment Plant Twin Oaks Valley Water Treatment PlantPlant 85% of limit Skinner Treatment PlantPlant 60% of limit
Chlorite	0.34–0.59 mg/LReported levelEscondido-Vista Water Treatment Plant	1 mg/LMCL	Within the limit
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.	7.1–32.6 ug/LReported levelVID Distribution System	None set	Within the limit
+By source (5)— VID Distribution System, Escondido-Vista Water Treatment Plant, Skinner Treatment Plant +2 more VID Distribution SystemZone 54% of limit Escondido-Vista Water Treatment PlantPlant 42% of limit Skinner Treatment PlantPlant 38% of limit Twin Oaks Valley Water Treatment PlantPlant 5% of limit Carlsbad Desalination PlantPlant 0% of limit

Metals

Contaminant	Measured	Federal limit	Status
CopperA metal that enters water from corroding household plumbing.	0.54 mg/L90th percentileVID Service Area	1.3 mg/LAction level	Within the limit
+By source (2)— VID Service Area, VID Service Area Action Levels Exceeded VID Service AreaZone avg0.54 mg/L42% of limit VID Service Area Action Levels ExceededZone 0% of limit
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.	4.2 ug/L90th percentileVID Service Area	None set	Within the limit
+By source (3)— VID Service Area Number of Samples, VID Service Area, VID Service Area Action Levels Exceeded VID Service Area Number of SamplesZone 340% of limit VID Service AreaZone avg4.2 ug/L28% of limit VID Service Area Action Levels ExceededZone 0% of limit
AluminumA common element sometimes used as a treatment coagulant.	0–160 ug/LReported levelTwin Oaks Valley Water Treatment Plant	None set	Detected — no federal limit
+By source (5)— Skinner Treatment Plant, Twin Oaks Valley Water Treatment Plant, Weese Filtration Plant +2 more Skinner Treatment PlantPlant Twin Oaks Valley Water Treatment PlantPlant Weese Filtration PlantPlant Carlsbad Desalination PlantPlant Escondido-Vista Water Treatment PlantPlant
Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium.	0–0.32 ug/LReported levelTwin Oaks Valley Water Treatment Plant	None set	Detected — no federal limit
+By source (2)— Twin Oaks Valley Water Treatment Plant, Escondido-Vista Water Treatment Plant Twin Oaks Valley Water Treatment PlantPlant Escondido-Vista Water Treatment PlantPlant
LithiumA naturally occurring element found in some groundwater.	13–52 ug/LReported levelEscondido-Vista Water Treatment Plant	None set	Detected — no federal limit
+By source (2)— Escondido-Vista Water Treatment Plant, San Diego County Water Authority Escondido-Vista Water Treatment PlantPlant San Diego County Water AuthorityZone

Radionuclides

Contaminant	Measured	Federal limit	Status
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.	0–4.8 pCi/LReported levelEscondido-Vista Water Treatment Plant	15 pCi/LMCL	Within the limit
+By source (5)— Escondido-Vista Water Treatment Plant, Skinner Treatment Plant, Weese Filtration Plant +2 more Escondido-Vista Water Treatment PlantPlant 32% of limit Skinner Treatment PlantPlant 27% of limit Weese Filtration PlantPlant 21% of limit Carlsbad Desalination PlantPlant 0% of limit Twin Oaks Valley Water Treatment PlantPlant 0% of limit
Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances.	5.5–22.1 pCi/LReported levelEscondido-Vista Water Treatment Plant	None set	Detected — no federal limit
+By source (4)— Escondido-Vista Water Treatment Plant, Skinner Treatment Plant, Twin Oaks Valley Water Treatment Plant +1 more Escondido-Vista Water Treatment PlantPlant Skinner Treatment PlantPlant Twin Oaks Valley Water Treatment PlantPlant Carlsbad Desalination PlantPlant
UraniumA naturally occurring radioactive metal from erosion of natural deposits.	0–3 pCi/LReported levelSkinner Treatment Plant	20 pCi/LMCL	Detected — no federal limit
+By source (5)— Skinner Treatment Plant, Twin Oaks Valley Water Treatment Plant, Weese Filtration Plant +2 more Skinner Treatment PlantPlant Twin Oaks Valley Water Treatment PlantPlant Weese Filtration PlantPlant Escondido-Vista Water Treatment PlantPlant Carlsbad Desalination PlantPlant

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
FluorideA mineral often added to drinking water to help prevent tooth decay.	0.6–0.8 mg/LReported levelSkinner Treatment Plant	4 mg/LMCL	Within the limit
+By source (4)— Skinner Treatment Plant, Carlsbad Desalination Plant, Escondido-Vista Water Treatment Plant +1 more Skinner Treatment PlantPlant 20% of limit Carlsbad Desalination PlantPlant 20% of limit Escondido-Vista Water Treatment PlantPlant 18% of limit Twin Oaks Valley Water Treatment PlantPlant 18% of limit
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.	Not detected mg/LReported levelSkinner Treatment Plant	10 mg/LMCL	None detected
+By source (5)— Skinner Treatment Plant, Carlsbad Desalination Plant, Twin Oaks Valley Water Treatment Plant +2 more Skinner Treatment PlantPlant 0% of limit Carlsbad Desalination PlantPlant 0% of limit Twin Oaks Valley Water Treatment PlantPlant 0% of limit Weese Filtration PlantPlant 0% of limit Escondido-Vista Water Treatment PlantPlant 0% of limit

Physical & aggregate

Contaminant	Measured	Federal limit	Status
TurbidityA measure of cloudiness from suspended particles in the water.	0.2 NTUReported levelEscondido-Vista Water Treatment Plant	None set	Within the limit
+By source (5)— Escondido-Vista Water Treatment Plant, Weese Filtration Plant, Twin Oaks Valley Water Treatment Plant +2 more Escondido-Vista Water Treatment PlantPlant 20% of limit Weese Filtration PlantPlant 20% of limit Twin Oaks Valley Water Treatment PlantPlant 9% of limit Carlsbad Desalination PlantPlant 8% of limit Skinner Treatment PlantPlant 7% of limit
AlkalinityA measure of the water's capacity to neutralize acids.	99–133 mg/LReported levelWeese Filtration Plant	None set	Detected — no federal limit
+By source (5)— Weese Filtration Plant, Escondido-Vista Water Treatment Plant, Twin Oaks Valley Water Treatment Plant +2 more Weese Filtration PlantPlant Escondido-Vista Water Treatment PlantPlant Twin Oaks Valley Water Treatment PlantPlant Skinner Treatment PlantPlant Carlsbad Desalination PlantPlant
Bicarbonate	134–159 mg/LReported levelEscondido-Vista Water Treatment Plant	None set	Detected — no federal limit
HardnessA measure of dissolved calcium and magnesium minerals.	170–310 mg/LReported levelWeese Filtration Plant	None set	Detected — no federal limit
+By source (4)— Weese Filtration Plant, Skinner Treatment Plant, Escondido-Vista Water Treatment Plant +1 more Weese Filtration PlantPlant Skinner Treatment PlantPlant Escondido-Vista Water Treatment PlantPlant Carlsbad Desalination PlantPlant
TOCTotal organic carbon — a measure of organic material dissolved in the water.	1.9–3.4 mg/LReported levelEscondido-Vista Water Treatment Plant	None set	Detected — no federal limit
+By source (2)— Escondido-Vista Water Treatment Plant, Skinner Treatment Plant Escondido-Vista Water Treatment PlantPlant Skinner Treatment PlantPlant

Microbial

Contaminant	Measured	Federal limit	Status
Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals.	0–0 %Reported levelVID Distribution System	0 %Public health goal	None detected
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.	1.7 %Reported levelVID Distribution System	None set	Detected — no federal limit

PFAS ("forever chemicals")

Contaminant	Measured	Federal limit	Status
PFAS	Not detected ug/LReported levelSan Diego County Water Authority	None set	None detected
+By source (2)— San Diego County Water Authority, Escondido-Vista Water Treatment Plant San Diego County Water AuthorityZone Escondido-Vista Water Treatment PlantPlant

Source: Vista Irrigation District — Vista, 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.