Drinking water quality · 2023
· Verified
What's in California Water Service Co - Westlake — San Jose, Ca, CA tap water
26 contaminants were measured in the California Water Service Co - Westlake — San Jose, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 26
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 2.5 mg/LRunning annual avgDistribution System Highest LRAA | 4 mg/LMCL | Within the limit |
+By source (2)— Distribution System, Distribution System Highest LRAA
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 2.3 mg/LRunning annual avgAll MWD Plants | 4 mg/LMCL | Within the limit |
+By source (2)— Distribution System-Wide, All MWD Plants
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 28 ug/LAverageDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (3)— Distribution System-Wide, All MWD Plants, Distribution System-Wide Highest Annual
| |||
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 3.1 ug/LRunning annual avgMWD Jensen Plant | 10 ug/LMCL | Within the limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 15 ug/LAverageDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (3)— Distribution System-Wide, All MWD Plants, Distribution System-Wide Highest Annual
| |||
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 71 ug/LAverageMWD Jensen Plant | 800 ug/LNL | Detected — no federal limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 3 ug/LAverageCalleguas MWD | None set | Within the limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| CopperA metal that enters water from corroding household plumbing. | 0.216 mg/L90th percentileDistribution System-Wide | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileDistribution System-Wide | None set | None detected |
| SeleniumA trace element from natural deposits and industrial discharge. | Not detected ug/LAverageMWD Jensen Plant | None set | Within the limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| AluminumA common element sometimes used as a treatment coagulant. | 62 ug/LAverageMWD Jensen Plant | None set | Detected — no federal limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
| BoronA naturally occurring element from rock and soil. | 0.28 mg/LAverageCalleguas MWD | 1 mg/LNL | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 38 mg/LAverageMWD Jensen Plant | None set | Detected — no federal limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 17 mg/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 4 mg/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| SodiumA naturally occurring salt component. | 89 mg/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.7 mg/LAverageAll MWD Plants | 4 mg/LMCL | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.5 mg/LAverageMWD Jensen Plant | 10 mg/LMCL | Within the limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.04 NTUMaximumMWD Jensen Plant | None set | Within the limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
| AlkalinityA measure of the water's capacity to neutralize acids. | 125 mg/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 163 mg/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| pHA measure of how acidic or basic the water is. | 8.3AverageMWD Jensen Plant | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 2.7 mg/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0MaximumDistribution System-Wide Highest Monthly | None set | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 5.5 pCi/LAverageCalleguas MWD | None set | Detected — no federal limit |
+By source (2)— Calleguas MWD, MWD Jensen Plant
| |||
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2 pCi/LAverageMWD Jensen Plant | 20 pCi/LMCL | Detected — no federal limit |
+By source (2)— MWD Jensen Plant, Calleguas MWD
| |||
Source: California Water Service Co - Westlake — San Jose, 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.
People also ask about California Water Service Co - Westlake — San Jose, Ca, CA's water
+Is California Water Service Co - Westlake — San Jose, Ca, CA tap water safe to drink in 2023?
Every one of the 26 contaminants measured in California Water Service Co - Westlake — San Jose, Ca, CA's 2023 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in California Water Service Co - Westlake — San Jose, Ca, CA tap water?
26 contaminants were measured in California Water Service Co - Westlake — San Jose, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 9 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from California Water Service Co - Westlake — San Jose, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is California Water Service Co - Westlake — San Jose, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.
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