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Tap water quality report

Cerritos, CA

EPA monitoring detected 21 contaminants across the 1 water supplier serving Cerritos. 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
47,475
people served
21
contaminants found
California rankings Lead in California PFAS in California

What was found in Cerritos'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
510 µg/L 5.1%
of the EPA limit 10000 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Fluoride
386 µg/L 9.7%
of the EPA limit 4000 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2018
1/1 SYR4
Barium
180 µg/L 9%
of the EPA limit 2000 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2018
1/1 SYR4
Lithium
61 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2025
1/1 UCMR-5
TTHM
19.015 µg/L 24%
of the EPA limit 80 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Dibromochloromethane
8.5 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Bromoform
7.93 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Arsenic
7.56 µg/L 76%
of the EPA limit 10 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2018
1/1 SYR4
Total Haloacetic Acids (HAA5)
6.546 µg/L 11%
of the EPA limit 60 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Monochloroacetic Acid
5.375 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Chloroform
4.122 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Bromodichloromethane
3.244 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Trichloroethylene
2.7 µg/L 54%
of the EPA limit 5 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Dibromoacetic Acid
2.652 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Combined Uranium
2.2201 µg/L 7.4%
of the EPA limit 30 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2017
1/1 SYR4
1,1-Dichloroethylene
1.695 µg/L 24%
of the EPA limit 7 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Trichloroacetic Acid
1.6 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Dichloroacetic Acid
1.4 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
Tetrachloroethylene
0.5575 µg/L 11%
of the EPA limit 5 µg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019
1/1 SYR4
PFOS
0.0048 µg/L
No EPA limit set
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2025
1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2022
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 Cerritos

SupplierPopulation served
CERRITOS - CITY, WATER DEPT. 47,475

Frequently asked questions about Cerritos tap water

Is Cerritos tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Cerritos. 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 Cerritos?

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

What contaminants are in Cerritos's water?

The contaminants EPA monitoring detected in Cerritos include Nitrate, Fluoride, Barium, Lithium, TTHM. 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.