Drinking water quality · 2023
· Verified
· PWSID CA4010010
What's in San Miguel Community Services District — San Miguel, Ca, CA tap water
3 contaminants in San Miguel Community Services District — San Miguel, Ca, CA's water sat at or above a federal limit, led by Arsenic at 1.3x the limit.
- !3 contaminants at or above a federal limit — worst is Arsenic at 1.3x
- !12 of 27 core regulated contaminants reported — 15 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.
- −46 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −11 core regulated contaminants never reported (12/27)
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
- Arsenic1.3× the federal limit3–13 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
- Gross Alpha1.2× the federal limit10.8–18 pCi/L · limit 15 pCi/L
Long-term exposure above the federal limit increases cancer risk.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- PFOS1.1× the federal limit0–4.5 ng/L · limit 4 ng/L
Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 50% of CA systems that report it · higher than 55% of U.S. systems
+13 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Nitrate | 1.6–7.5 mg/L | 10 mg/L |
| Chlorine Total | 0.27–2.24 mg/L | 4 mg/L |
| Selenium | 0–10 ug/L | 50 ug/L |
| Perfluorohexanesulfonic acid | 0–1.9 ng/L | 10 ng/L |
| TTHM | 11 ug/L | 80 ug/L |
| Fluoride | 0.01–0.4 mg/L | 4 mg/L |
| Copper | 0.124 mg/L | 1.3 mg/L |
| Boron | 0–0.4 mg/L | 1 mg/L |
| Chromium, Hexavalent | 0.95–1.5 ug/L | — |
| Lead | 0.0 mg/L | 0.015 mg/L |
| Vanadium | 12–20 ug/L | 50 ug/L |
| Escherichia coli (E. coli) | 0 | 0 |
| Uranium | 7.62–12 pCi/L | 20 pCi/L |
What this report doesn't tell you
15 of the 27 contaminants a community water system normally reports do not appear anywhere in San Miguel Community Services District — San Miguel, 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.
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗