Drinking water quality · 2023
· Verified
· PWSID CA1910090
What's in Monrovia-city, Water Dept. — Monrovia, Ca, CA tap water
2 contaminants in Monrovia-city, Water Dept. — Monrovia, Ca, CA's water sat at or above a federal limit, led by PFOS at 2.2x the limit.
- !2 contaminants at or above a federal limit — worst is PFOS at 2.2x
- !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
- PFOS2.2× the federal limit8.95 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 75% of CA systems that report it · higher than 75% of U.S. systems
- PFOA1.6× the federal limit6.37 ng/L · limit 4 ng/L
Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 75% of CA systems that report it · higher than 80% of U.S. systems
+20 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Perfluorohexanesulfonic acid | 3.44 ng/L | 10 ng/L |
| Chlorine | 0.98 mg/L | 4 mg/L |
| TTHM | 13.75 ug/L | 80 ug/L |
| Nitrate | 1.29 mg/L | 10 mg/L |
| Fluoride | 0.44 mg/L | 4 mg/L |
| Gross Alpha | 1.3 pCi/L | 15 pCi/L |
| Copper | 0.074 mg/L | 1.3 mg/L |
| Lead | 0.001 ug/L | 15 ug/L |
| HAA5 | Not detected ug/L | 60 ug/L |
| Chloride | 29 mg/L | — |
| Sulfate | 24.2 mg/L | — |
| Chromium, Hexavalent | 2.8 ug/L | — |
| Escherichia coli (E. coli) | 0 % | — |
| Total Coliform | 0 % | — |
| Perfluoroheptanoic acid | 2.82 ng/L | — |
| Perfluorohexanoic acid | 22 ng/L | — |
| Odor | 1 | — |
| Specific Conductance | 408 uS/cm | — |
| Total Dissolved Solids | 232 mg/L | — |
| Trichloroethylene | Not detected ug/L | 5 ug/L |
What this report doesn't tell you
15 of the 27 contaminants a community water system normally reports do not appear anywhere in Monrovia-city, Water Dept. — Monrovia, 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 ↗