Drinking water quality · 2023
· Verified
What's in California Water Service - Stockton — San Jose, Ca, CA tap water
32 contaminants were measured in the California Water Service - Stockton — San Jose, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 32
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
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.
No federal drinking-water violations on record for this system.
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 57 ug/LAverageDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (2)— Distribution System-Wide, Distribution System-Wide Highest Annual
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 25 ug/LAverageDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (2)— Distribution System-Wide, Distribution System-Wide Highest Annual
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 4 ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, Sewd
| |||
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.14 mg/LAverageGroundwater | 2 mg/LMCL | Within the limit |
+By source (2)— Groundwater, Sewd
| |||
| CopperA metal that enters water from corroding household plumbing. | Not detected mg/L90th percentileDistribution System-Wide | 1.3 mg/LAction level | None detected |
| 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 |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| BoronA naturally occurring element from rock and soil. | Not detected mg/LAverageGroundwater | 1 mg/LNL | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 33 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 2.5 ug/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 16 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 4.9 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| SodiumA naturally occurring salt component. | 23 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| Vanadium | 19 ug/LAverageGroundwater | 50 ug/LNL | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 2.2 mg/LAverageGroundwater | 10 mg/LMCL | Within the limit |
+By source (2)— Groundwater, Sewd
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | Not detected mg/LAverageGroundwater | 4 mg/LMCL | Within the limit |
+By source (2)— Groundwater, Sewd
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Free | 0.88 mg/LAverageDistribution System-Wide | 4 mg/LMCL | Within the limit |
| Chromium | Not detected ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, Sewd
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.1 pCi/LAverageGroundwater | 15 pCi/LMCL | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2.2 pCi/LAverageGroundwater | 20 pCi/LMCL | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.08 NTUMaximumSewd | None set | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 171 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 150 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| pHA measure of how acidic or basic the water is. | 8AverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 2.2 mg/LMaximumSystem-wide | None set | Detected — no federal limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0.29 ng/LAverageGroundwater | 3 ng/LNL | Within the limit |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | Not detected ng/LAverageGroundwater | 6.5 ng/LNL | Within the limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.13 ng/LAverageGroundwater | None set | Detected — no federal limit |
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 |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing. | Not detected ug/LAverageGroundwater | 5 ug/LMCL | Within the limit |
+By source (2)— Groundwater, Sewd
| |||
| 1,2,3-TCP | Not detected ng/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Sewd
| |||
| Dichlorodifluoromethane | Not detected ug/LAverageGroundwater | 1000 ug/LNL | Detected — no federal limit |
Source: California Water Service - Stockton — 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 - Stockton — San Jose, Ca, CA's water
+Is California Water Service - Stockton — San Jose, Ca, CA tap water safe to drink in 2023?
Every one of the 32 contaminants measured in California Water Service - Stockton — 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 - Stockton — San Jose, Ca, CA tap water?
32 contaminants were measured in California Water Service - Stockton — San Jose, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and pfas ("forever chemicals"). 13 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 - Stockton — 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 - Stockton — 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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