Drinking water quality · 2021
· Verified
What's in Commerce-city, Water Dept. — San Jose, Ca, CA tap water
25 contaminants were measured in the Commerce-city, Water Dept. — San Jose, Ca, CA water system's 2021 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2021
- Contaminants measured
- 25
- Over federal limit
- 2
- Approaching the limit
- 0
- Worst contaminant
- PFOS
- Service area
- CA
5.0× the limit
state-level CCR
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 20 ng/LAverageGroundwater | 6.5 ng/LNL | At or above the limit |
+By source (2)— Groundwater, West Basin MWD
| |||
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 10 ng/LAverageGroundwater | 5.1 ng/LNL | At or above the limit |
+By source (2)— Groundwater, West Basin MWD
| |||
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 3 ng/LAverageGroundwater | 3 ng/LNL | Within the limit |
+By source (2)— Groundwater, West Basin MWD
| |||
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 5.3 ng/LAverageGroundwater | 500 ng/LNL | Detected — no federal limit |
+By source (2)— Groundwater, West Basin MWD
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 2 mg/LAverageDistribution System-Wide | 4 mg/LMCL | Within the 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. | 31 ug/LRunning annual avgDistribution 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. | 7.4 ug/LRunning annual avgDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (2)— Distribution System-Wide, Distribution System-Wide Highest Annual
| |||
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 165.5 ug/LAverageWest Basin MWD | 800 ug/LNL | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.54 mg/LAverageWest Basin MWD | 2 mg/LMCL | Within the limit |
+By source (2)— West Basin MWD, Groundwater Average/
| |||
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 1.2 ug/LAverageWest Basin MWD | None set | Within the limit |
+By source (3)— Groundwater, West Basin MWD, Groundwater Average/
| |||
| 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. | 109 ug/LAverageWest Basin MWD | None set | Detected — no federal limit |
+By source (2)— West Basin MWD, Groundwater Average/
| |||
| BoronA naturally occurring element from rock and soil. | 0.18 mg/LAverageWest Basin MWD | 1 mg/LNL | Detected — no federal limit |
+By source (2)— West Basin MWD, Groundwater
| |||
| Vanadium | 3.1 ug/LAverageWest Basin MWD | 50 ug/LNL | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.7 mg/LAverageWest Basin MWD | 4 mg/LMCL | Within the limit |
+By source (3)— West Basin MWD, Groundwater, Groundwater Average/
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 1 mg/LAverageGroundwater Average/ | 10 mg/LMCL | Within the limit |
+By source (3)— Groundwater, Groundwater Average/, West Basin MWD
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.05 NTUMaximumWest Basin MWD | None set | Within the limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.95 mg/LAverageWest Basin MWD | 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 |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detected pCi/LAverageWest Basin MWD | 0.019 pCi/LPublic health goal | Within the limit |
+By source (2)— West Basin MWD, Groundwater
| |||
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 3 pCi/LAverageWest Basin MWD | None set | Detected — no federal limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 1 pCi/LAverageWest Basin MWD | 20 pCi/LMCL | Detected — no federal limit |
+By source (2)— West Basin MWD, Groundwater
| |||
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | Not detected ug/LAverageGroundwater | 5 ug/LMCL | Within the limit |
+By source (2)— Groundwater, West Basin MWD
| |||
| TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing. | Not detected ug/LAverageGroundwater | 5 ug/LMCL | Within the limit |
+By source (2)— Groundwater, West Basin MWD
| |||
Source: Commerce-city, Water Dept. — San Jose, Ca, CA's 2021 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 Commerce-city, Water Dept. — San Jose, Ca, CA's water
+Is Commerce-city, Water Dept. — San Jose, Ca, CA tap water safe to drink in 2021?
The 2021 Consumer Confidence Report for the Commerce-city, Water Dept. — San Jose, Ca, CA water utility lists 2 contaminants at or above the federal limit: PFOS and PFOA. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Commerce-city, Water Dept. — San Jose, Ca, CA tap water?
25 contaminants were measured in Commerce-city, Water Dept. — San Jose, Ca, CA's 2021 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and disinfection byproducts. 16 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Commerce-city, Water Dept. — San Jose, Ca, CA tap water?
2 contaminants in Commerce-city, Water Dept. — San Jose, Ca, CA's 2021 report sit at or above the federal limit: PFOS (5.0× the limit); PFOA (2.5× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Commerce-city, Water Dept. — San Jose, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2021 report is PFOS, at 5.0× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Commerce-city, Water Dept. — San Jose, Ca, CA's 2021 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 Commerce-city, Water Dept. — 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 2021 report; a new report will replace it once the utility publishes its next annual update.
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