Drinking water quality · 2023
· Verified
What's in Cwsc Los Altos Suburban — San Jose, Ca, CA tap water
26 contaminants were measured in the Cwsc Los Altos Suburban — 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
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.
- Maximum contaminant level exceededHealth-based1 violation on record · most recent Nov 1992resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 51 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. | 26 ug/LAverageDistribution System-Wide Highest Annual | None set | Within the limit |
+By source (2)— Distribution System-Wide, Distribution System-Wide Highest Annual
| |||
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detected ug/LAverageGroundwater | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 4.4 mg/LAverageGroundwater | 10 mg/LMCL | Within the limit |
+By source (2)— Groundwater, Valley Water
| |||
| 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, Valley Water
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 1.5 mg/LAverageDistribution System-Wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.39 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | Not detected mg/LAverageGroundwater | 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 |
| CalciumA naturally occurring mineral that contributes to water hardness. | 81 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Valley Water
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 1.2 ug/LAverageGroundwater | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 26 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Valley Water
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 3 mg/LAverageValley Water | None set | Detected — no federal limit |
+By source (2)— Valley Water, Groundwater
| |||
| SilicaA naturally occurring compound from sand and rock. | 12 mg/LAverageValley Water | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 47 mg/LAverageValley Water | None set | Detected — no federal limit |
+By source (2)— Groundwater, Valley Water
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.3 NTUMaximumValley Water | None set | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 267 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Valley Water
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 309 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Valley Water
| |||
| pHA measure of how acidic or basic the water is. | 7.7AverageValley Water | None set | Detected — no federal limit |
+By source (2)— Groundwater, Valley Water
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.6 mg/LAverageSystem-wide | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.3 pCi/LAverageValley Water | 15 pCi/LMCL | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detected pCi/LAverageGroundwater | 0.019 pCi/LPublic health goal | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 1.3 pCi/LAverageValley Water | 20 pCi/LMCL | Detected — no federal limit |
+By source (2)— Valley Water, Groundwater
| |||
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 |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Dehp | Not detected ug/LAverageGroundwater | None set | Within the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.19 ng/LAverageGroundwater | None set | Detected — no federal limit |
Source: Cwsc Los Altos Suburban — 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 Cwsc Los Altos Suburban — San Jose, Ca, CA's water
+Is Cwsc Los Altos Suburban — San Jose, Ca, CA tap water safe to drink in 2023?
Every one of the 26 contaminants measured in Cwsc Los Altos Suburban — 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 Cwsc Los Altos Suburban — San Jose, Ca, CA tap water?
26 contaminants were measured in Cwsc Los Altos Suburban — San Jose, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 8 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 Cwsc Los Altos Suburban — 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 Cwsc Los Altos Suburban — 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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