Drinking water quality · 2023
· Verified
What's in California Water Service-s San Francisco — San Jose, Ca, CA tap water
31 contaminants were measured in the California Water Service-s San Francisco — San Jose, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 31
- 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. | 2.9 mg/LAverageDistribution System-Wide | 4 mg/LMCL | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 36 ug/LRunning annual avgDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (2)— Distribution System-Wide, Distribution System-Wide Highest Annual
| |||
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 38 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. | 144 ug/LAverageSFPUC | 800 ug/LNL | Detected — no federal limit |
+By source (2)— SFPUC, Groundwater
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.4 NTUMaximumSFPUC Water | None set | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 260 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 369 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
| pHA measure of how acidic or basic the water is. | 8.6AverageGroundwater | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.5 mg/LAverageSFPUC | None set | 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/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | Not detected mg/LAverageSystem-wide | 10 mg/LMCL | Within the limit |
| BromideA naturally occurring salt found in source water. | Not detected ug/LAverageSFPUC | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.08 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | Not detected ug/LAverageSystem-wide | None set | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | Not detected mg/LAverageSystem-wide | 2 mg/LMCL | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | None detected |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected mg/LAverageSystem-wide | None set | Detected — no federal limit |
| BoronA naturally occurring element from rock and soil. | 0.04 mg/LAverageSFPUC | 1 mg/LNL | Detected — no federal limit |
+By source (2)— SFPUC, Groundwater
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 80 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.1 ug/LAverageSystem-wide | None set | Detected — no federal limit |
| LithiumA naturally occurring element found in some groundwater. | 11 ug/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 42 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 4 mg/LAverageGroundwater | None set | Detected — no federal limit |
| SilicaA naturally occurring compound from sand and rock. | 7.5 mg/LAverageSFPUC | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 81 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
| Vanadium | Not detected ug/LAverageGroundwater | 50 ug/LNL | 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. | 0MaximumMonthly | None set | None detected |
| Giardia lamblia | 0.02AverageSFPUC | None set | Detected — no federal limit |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 1Reported levelLevel 1 Assessment Required and Completed | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | Not detected pCi/LAverageSystem-wide | 20 pCi/LMCL | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected ng/LAverageSFPUC | None set | Detected — no federal limit |
+By source (2)— Groundwater, SFPUC
| |||
Source: California Water Service-s San Francisco — 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-s San Francisco — San Jose, Ca, CA's water
+Is California Water Service-s San Francisco — San Jose, Ca, CA tap water safe to drink in 2023?
Every one of the 31 contaminants measured in California Water Service-s San Francisco — 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-s San Francisco — San Jose, Ca, CA tap water?
31 contaminants were measured in California Water Service-s San Francisco — 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-s San Francisco — 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-s San Francisco — 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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