Drinking water quality · 2023
· Verified
· PWSID CA1510033
What's in Cws - Kernville — San Jose, Ca, CA tap water
1 contaminant in Cws - Kernville — San Jose, Ca, CA's water sat at or above a federal limit, led by Turbidity at 5.7x the limit.
- !1 contaminant at or above a federal limit — worst is Turbidity at 5.7x
- !11 of 27 core regulated contaminants reported — 16 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −36 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −6 health-based violations resolved in the last 5 years
- −13 core regulated contaminants never reported (11/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Turbidity5.7× the federal limit0.19–5.7 NTU · limit 1 NTU
High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
Higher than 95% of CA systems that report it · higher than 90% of U.S. systems
+32 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| HAA5 | 28 ug/L | 60 ug/L |
| TTHM | 29 ug/L | 80 ug/L |
| Arsenic | 3.5 ug/L | 10 ug/L |
| Chlorine Free | 1.1 mg/L | 4 mg/L |
| Fluoride | 0.76 mg/L | 4 mg/L |
| Chloride | 9.3–16 mg/L | — |
| Nitrate | Not detected mg/L | 10 mg/L |
| Sulfate | 47–150 mg/L | — |
| Aluminum | 70 ug/L | — |
| Boron | Not detected mg/L | 1 mg/L |
| Calcium | 56 mg/L | — |
| Copper | Not detected mg/L | 1.3 mg/L |
| Lead | Not detected ug/L | 15 ug/L |
| Lithium | 13 ug/L | — |
| Magnesium | 12 mg/L | — |
| Manganese | 0–55 ug/L | — |
| Potassium | 3.2 mg/L | — |
| Sodium | 34 mg/L | — |
| Zinc | 0–0.09 mg/L | — |
| Escherichia coli (E. coli) | 0 | — |
| Perfluorobutanesulfonic acid | 0.21 ng/L | 500 ng/L |
| Perfluoropentanoic acid | 1.9 ng/L | — |
| PFBA | 1.6 ng/L | — |
| Alkalinity | 163 mg/L | — |
| Hardness | 191 mg/L | — |
| Odor | 0–1.2 | — |
| pH | 7.4 | — |
| Specific Conductance | 480–580 | — |
| TOC | 1.2 mg/L | — |
| Total Dissolved Solids | 310–420 mg/L | — |
| Gross Alpha | Not detected pCi/L | 15 pCi/L |
| Uranium | 1.2 pCi/L | 20 pCi/L |
What this report doesn't tell you
16 of the 27 contaminants a community water system normally reports do not appear anywhere in Cws - Kernville — San Jose, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
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-based12 violations on record · most recent Oct 2019resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗