Drinking water quality · 2023
· Verified
· PWSID CA5410513
What's in Nps-ash Mountain — Three Rivers, Ca, CA tap water
Only 9 of 27 core regulated contaminants were reported for Nps-ash Mountain — Three Rivers, Ca, CA. What was measured is not clean — but most of the picture is missing.
- !1 contaminant at or above a federal limit — worst is Turbidity at 1.0x
- !1 open monitoring or reporting violation
- !9 of 27 core regulated contaminants reported — 18 never appear in this report
+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.
- −12 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −3 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −16 core regulated contaminants never reported (9/27)
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
- Turbidity1.0× the federal limit1 NTU · limit 1 NTU
High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
Higher than 85% of CA systems that report it · higher than 85% of U.S. systems
+11 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Nitrite | 0–0.6 mg/L | 1 mg/L |
| Arsenic | 2–6 ug/L | 10 ug/L |
| TTHM | 10 ug/L | 80 ug/L |
| Nitrate | 0–0.6 mg/L | 10 mg/L |
| Fluoride | 0.1–0.2 mg/L | 4 mg/L |
| HAA5 | 0 ug/L | 60 ug/L |
| Copper | 0 mg/L | 1.3 mg/L |
| Lead | 0.0 mg/L | 0.015 mg/L |
| Escherichia coli (E. coli) | 0 | 0 |
| Alkalinity | 185 | — |
| Bicarbonate | 225 | — |
What this report doesn't tell you
18 of the 27 contaminants a community water system normally reports do not appear anywhere in Nps-ash Mountain — Three Rivers, 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.
- Reporting1 violation on record · most recent Jul 20251 open
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗