Drinking water quality · 2023
· Verified
· PWSID CA1010021
What's in Mendota, City of — Mendota, Ca, CA tap water
4 contaminants in Mendota, City of — Mendota, Ca, CA's water sat at or above a federal limit, led by Benzene at 26.0x the limit.
- !4 contaminants at or above a federal limit — worst is Benzene at 26.0x
- !1 contaminant within 20% of a limit
- !15 of 27 core regulated contaminants reported — 12 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.
- −60 contaminants at or above a federal limit
- −4 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
- −6 core regulated contaminants never reported (15/27)
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
- Benzene26.0× the federal limit82–130 ug/L · limit 5 ug/L
- TTHM1.0× the federal limit28–82 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- Selenium1.0× the federal limit5–50 ug/L · limit 50 ug/L
Essential in tiny amounts, but long-term exposure above the federal limit can cause hair and fingernail loss and circulatory problems.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- Simazine1.0× the federal limit0.004–4 ug/L · limit 4 ug/L
- PFOS83% of the federal limit3.3 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 40% of CA systems that report it · higher than 50% of U.S. systems
+38 contaminants were measured and came in below the limitShow all
What this report doesn't tell you
12 of the 27 contaminants a community water system normally reports do not appear anywhere in Mendota, City of — Mendota, 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-based3 violations on record · most recent Sep 2013resolved
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗