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Tap water quality report

Compton, CA

EPA monitoring detected 26 contaminants across the 2 water suppliers serving Compton. 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.

2
water suppliers
76,377
people served
26
contaminants found
California rankings Lead in California PFAS in California

What was found in Compton'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
Copper
4427 µg/L 341%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
1/2 SYR4
Nitrate
1303.78 µg/L 13%
of the EPA limit 10000 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
Highest in the city: 1700 µg/L — LYNWOOD PARK MUTUAL WATER CO. · 1,500 people · 2019
2/2 SYR4
Fluoride
376 µg/L 9.4%
of the EPA limit 4000 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
Highest in the city: 377.5 µg/L — LYNWOOD PARK MUTUAL WATER CO. · 1,500 people · 2017
2/2 SYR4
Barium
142 µg/L 7.1%
of the EPA limit 2000 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Lithium
58 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024
1/2 UCMR-5
TTHM
55.8 µg/L 70%
of the EPA limit 80 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Dibromochloromethane
21.76 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
19.005 µg/L 32%
of the EPA limit 60 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Lead
17 µg/L 113%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
1/2 SYR4
Bromoform
16.68 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Bromodichloromethane
16.4 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Chloroform
12.785 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Dichloroacetic Acid
9.695 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Combined Uranium
7.71075 µg/L 26%
of the EPA limit 30 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Dibromoacetic Acid
6.83 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Trichloroacetic Acid
5.82 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Tetrachloroethylene
3.98 µg/L 80%
of the EPA limit 5 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
Highest in the city: 5.4 µg/L — LYNWOOD PARK MUTUAL WATER CO. · 1,500 people · 2019
2/2 SYR4
Arsenic
4.92 µg/L 49%
of the EPA limit 10 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
2/2 SYR4
Xylenes, Total
3.6 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: LYNWOOD PARK MUTUAL WATER CO. · 1,500 people · 2019
1/2 SYR4
Trichloroethylene
3.08 µg/L 62%
of the EPA limit 5 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
1/2 SYR4
cis-1,2-Dichloroethylene
2.3 µg/L 3.3%
of the EPA limit 70 µg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019
1/2 SYR4
Ethylbenzene
0.7600 µg/L 0.1%
of the EPA limit 700 µg/L
Highest in the city: LYNWOOD PARK MUTUAL WATER CO. · 1,500 people · 2019
1/2 SYR4
PFOS
0.0170 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024
1/2 UCMR-5
PFOA
0.0049 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024
1/2 UCMR-5
PFHXS
0.0041 µg/L
No EPA limit set
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024
1/2 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024
2/2 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 Compton

SupplierPopulation served
COMPTON-CITY, WATER DEPT. 74,877
LYNWOOD PARK MUTUAL WATER CO. 1,500

Frequently asked questions about Compton tap water

Is Compton tap water safe to drink?

EPA testing detected 26 contaminants in the water serving Compton. 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 Compton?

2 public water suppliers report drinking-water monitoring for Compton, California to the EPA. Each is listed above with its population served.

What contaminants are in Compton's water?

The contaminants EPA monitoring detected in Compton include Copper, Nitrate, Fluoride, Barium, Lithium. 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.