Tap WaterIndex

← California

Tap water quality report

Monrovia, CA

EPA monitoring detected 21 contaminants across the 1 water supplier serving Monrovia. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
37,931
people served
21
contaminants found
California rankings Lead in California PFAS in California

What was found in Monrovia's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
13000 µg/L 130%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Nitrate-Nitrite
12000 µg/L 120%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2017
1/1 SYR4
Fluoride
462 µg/L 12%
of the EPA limit 4000 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
TTHM
19 µg/L 24%
of the EPA limit 80 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Trichloroethylene
11 µg/L 220%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Bromoform
10.9 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Dibromochloromethane
7.035 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Combined Uranium
5.22245 µg/L 17%
of the EPA limit 30 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Bromodichloromethane
3 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Tetrachloroethylene
2.5 µg/L 50%
of the EPA limit 5 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Dibromoacetic Acid
2.48 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
2.48 µg/L 4.1%
of the EPA limit 60 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Chloroform
1.72 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
1,1-Dichloroethylene
0.8450 µg/L 12%
of the EPA limit 7 µg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2019
1/1 SYR4
Pfhxa
0.0140 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2025
1/1 UCMR-5
Pfpea
0.0097 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2025
1/1 UCMR-5
PFOS
0.0061 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2025
1/1 UCMR-5
PFOA
0.0054 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2025
1/1 UCMR-5
Pfba
0.0052 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2025
1/1 UCMR-5
PFHXS
0.0035 µg/L
No EPA limit set
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2025
1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: MONROVIA-CITY, WATER DEPT. · 37,931 people · 2024
1/1 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Monrovia

SupplierPopulation served
MONROVIA-CITY, WATER DEPT. 37,931

Frequently asked questions about Monrovia tap water

Is Monrovia tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Monrovia. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Monrovia?

1 public water supplier report drinking-water monitoring for Monrovia, California to the EPA. Each is listed above with its population served.

What contaminants are in Monrovia's water?

The contaminants EPA monitoring detected in Monrovia include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Trichloroethylene. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.