Drinking water quality · 2021
· Verified
What's in Monrovia-city, Water Dept. — Monrovia, Ca, CA tap water
16 contaminants were measured in the Monrovia-city, Water Dept. — Monrovia, Ca, CA water system's 2021 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2021
- Contaminants measured
- 16
- Over federal limit
- 2
- Approaching the limit
- 0
- Worst contaminant
- PFOS
- Service area
- CA
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 9.78 ng/LAverageSystem-wide | 6.5 ng/LNL | At or above the limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 5.38 ng/LAverageSystem-wide | 5.1 ng/LNL | At or above the limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 3.24 ng/LAverageSystem-wide | 3 ng/LNL | Within the limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 2.47 ng/LAverageSystem-wide | 4 ng/LNL | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 25.57 ng/LAverageSystem-wide | 4 ng/LNL | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 3.61 mg/LAverageSystem-wide | 10 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.39 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.94 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 15.15 ug/LAverageSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | Not detected ug/LAverageSystem-wide | None set | None detected |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.14 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 1.5 pCi/LAverageSystem-wide | 15 pCi/LMCL | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing. | 0.3 ug/LAverageSystem-wide | 5 ug/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0 %Highest single sampleSystem-wide | None set | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 1.96 %Highest single sampleSystem-wide | None set | Detected — no federal limit |
People also ask about Monrovia-city, Water Dept. — Monrovia, Ca, CA's water
+Is Monrovia-city, Water Dept. — Monrovia, Ca, CA tap water safe to drink in 2021?
The 2021 Consumer Confidence Report for the Monrovia-city, Water Dept. — Monrovia, Ca, CA water utility lists 2 contaminants at or above the federal limit: PFOS and PFOA. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Monrovia-city, Water Dept. — Monrovia, Ca, CA tap water?
16 contaminants were measured in Monrovia-city, Water Dept. — Monrovia, Ca, CA's 2021 Consumer Confidence Report, spanning pfas ("forever chemicals"), disinfection byproducts, and inorganic chemicals. 11 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Monrovia-city, Water Dept. — Monrovia, Ca, CA tap water?
2 contaminants in Monrovia-city, Water Dept. — Monrovia, Ca, CA's 2021 report sit at or above the federal limit: PFOS (2.4× the limit); PFOA (1.3× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Monrovia-city, Water Dept. — Monrovia, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2021 report is PFOS, at 2.4× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Monrovia-city, Water Dept. — Monrovia, Ca, CA's 2021 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Monrovia-city, Water Dept. — Monrovia, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2021 report; a new report will replace it once the utility publishes its next annual update.