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Tap water quality report

Chino Hills, CA

EPA monitoring detected 24 contaminants across the 1 water supplier serving Chino Hills. 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
76,414
people served
24
contaminants found
California rankings Lead in California PFAS in California

What was found in Chino Hills'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
9718 µg/L 97%
of the EPA limit 10000 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Nitrate-Nitrite
9700 µg/L 97%
of the EPA limit 10000 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2017
1/1 SYR4
Fluoride
605 µg/L 15%
of the EPA limit 4000 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Copper
79 µg/L 6.1%
of the EPA limit 1300 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
TTHM
66 µg/L 83%
of the EPA limit 80 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Barium
53.15 µg/L 2.7%
of the EPA limit 2000 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Dibromochloromethane
25.2 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Arsenic
22.75 µg/L 228%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Bromodichloromethane
20 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Bromoform
19 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
16.65 µg/L 28%
of the EPA limit 60 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Chloroform
14 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Selenium
10.54 µg/L 21%
of the EPA limit 50 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Chromium
9.98 µg/L 10%
of the EPA limit 100 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Monochloroacetic Acid
9.48 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Dichloroacetic Acid
9.445 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Trichloroethylene
7.37 µg/L 147%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Lead
6.5 µg/L 43%
of the EPA limit 15 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Dibromoacetic Acid
6.46 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Trichloroacetic Acid
3.715 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Monobromoacetic Acid
3.105 µg/L
No EPA limit set
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
1,1-Dichloroethylene
2.0315 µg/L 29%
of the EPA limit 7 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Tetrachloroethylene
0.5675 µg/L 11%
of the EPA limit 5 µg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CHINO HILLS, CITY OF · 76,414 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 Chino Hills

SupplierPopulation served
CHINO HILLS, CITY OF 76,414

Frequently asked questions about Chino Hills tap water

Is Chino Hills tap water safe to drink?

EPA testing detected 24 contaminants in the water serving Chino Hills. 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 Chino Hills?

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

What contaminants are in Chino Hills's water?

The contaminants EPA monitoring detected in Chino Hills include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.