Drinking water quality · 2023
· Verified
What's in Cwsc Oak Hills — San Jose, Ca, CA tap water
19 contaminants were measured in the Cwsc Oak Hills — San Jose, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 19
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.38 mg/L90th percentileAt the tap | 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 percentileAt the tap | None set | None detected |
| CalciumA naturally occurring mineral that contributes to water hardness. | 62 mg/LAverageGroundwater | None set | Detected — no federal limit |
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 9.5 ug/LAverageSystem-wide | None set | Detected — no federal limit |
| LithiumA naturally occurring element found in some groundwater. | 18 ug/LAverageGroundwater | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 24 mg/LAverageGroundwater | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 2.7 mg/LAverageGroundwater | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 59 mg/LAverageGroundwater | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Free | 1 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
| Chromium | 12 ug/LAverageSystem-wide | None set | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.8 mg/LAverageSystem-wide | 10 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.15 mg/LAverageSystem-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. | Not detected ug/LAverageAnnual Average | None set | None detected |
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | Not detected ug/LAverageAnnual Average | None set | None detected |
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 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AlkalinityA measure of the water's capacity to neutralize acids. | 150 mg/LAverageGroundwater | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 250 mg/LAverageGroundwater | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.5AverageGroundwater | 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 |
People also ask about Cwsc Oak Hills — San Jose, Ca, CA's water
+Is Cwsc Oak Hills — San Jose, Ca, CA tap water safe to drink in 2023?
Every one of the 19 contaminants measured in Cwsc Oak Hills — 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 Oak Hills — San Jose, Ca, CA tap water?
19 contaminants were measured in Cwsc Oak Hills — San Jose, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 5 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 Oak Hills — 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 Oak Hills — 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.