Tap Water Quality Report
Tap water quality in CHINO HILLS, California
Tap water in CHINO HILLS, California receives a grade of D (62/100) from TapWaterSafety.org. It's served by CHINO HILLS, CITY OF. The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CHINO HILLS's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CHINO HILLS.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 2.9 ppb, 725x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 16.7 ppb, 278x above the EWG health guideline of 0.06 ppb.
Recommended filters for CHINO HILLS
Filters matched to the specific contaminants in CHINO HILLS's water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in CHINO HILLS's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
2.9 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 725× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
16.7 ppb | 0.06 | — | — | — | — | — | 278× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
31.2 ppb | 0.15 | 80.0 | 100 | — | — | — | 208× over |
| Bromodichloromethane Disinfection byproduct |
8.03 ppb | 0.06 | — | — | — | — | — | 134× over |
| Chromium (hexavalent) Heavy metal |
2.39 ppb | 0.02 | — | — | — | — | — | 119× over |
| Dibromochloromethane Disinfection byproduct |
9.99 ppb | 0.1 | — | — | — | — | — | 100× over |
| Dibromoacetic acid Disinfection byproduct |
1.06 ppb | 0.03 | — | — | — | — | — | 35× over |
| Nitrate and nitrite Inorganic |
2.7 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 19× over |
| Nitrate Inorganic |
2.28 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 16× over |
| Bromoform Disinfection byproduct |
7.46 ppb | 0.5 | — | — | — | — | — | 15× over |
| Chloroform Disinfection byproduct |
5.68 ppb | 0.4 | — | — | — | — | — | 14× over |
| Trichloroacetic acid Disinfection byproduct |
1.41 ppb | 0.1 | — | — | — | — | — | 14× over |
| 1,2,3-Trichloropropane Other |
0.00444 ppb | 0.0007 | — | — | — | — | — | 6.3× over |
| Dichloroacetic acid Disinfection byproduct |
0.822 ppb | 0.2 | — | — | — | — | — | 4.1× over |
| Vanadium Other |
6.89 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
34.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Dichloromethane (methylene chloride) Volatile organic compound |
0.51 ppb | 4.0 | 5.0 | — | — | — | — | Below guideline |
| Molybdenum Other |
1.88 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
6.2 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
0.676 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0159 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.306 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.49 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CHINO HILLS, CITY OF.