Drinking water quality · 2023
· Verified
· PWSID CA2410012
What's in Hilmar County Water District — Hilmar, Ca, CA tap water
2 contaminants in Hilmar County Water District — Hilmar, Ca, CA's water sat at or above a federal limit, led by Nitrate at 3.4x the limit.
- !2 contaminants at or above a federal limit — worst is Nitrate at 3.4x
- !1 contaminant within 20% of a limit
- !10 of 27 core regulated contaminants reported — 17 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.
- −50 contaminants at or above a federal limit
- −4 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
- −14 core regulated contaminants never reported (10/27)
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
- Nitrate3.4× the federal limit1–34.3 mg/L · limit 10 mg/L
Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- Arsenic1.3× the federal limit1.02–13.2 ug/L · limit 10 ug/L
A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- Turbidity80% of the federal limit0.2–0.8 NTU · limit 1 NTU
High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
Higher than 75% of CA systems that report it · higher than 80% of U.S. systems
+8 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Chlorine | 0.48–0.73 mg/L | 4 mg/L |
| Copper | 0.172 mg/L | 1.3 mg/L |
| Barium | 60–135 ug/L | 2000 ug/L |
| Selenium | 1.7 ug/L | 50 ug/L |
| Fluoride | 0.1–0.13 mg/L | 4 mg/L |
| Lead | 0 ug/L | 15 ug/L |
| Nickel | 9.2 ug/L | — |
| Escherichia coli (E. coli) | 0 | 0 |
What this report doesn't tell you
17 of the 27 contaminants a community water system normally reports do not appear anywhere in Hilmar County Water District — Hilmar, 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-based17 violations on record · most recent Oct 2025resolved
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗