Tap Water Quality Report
Tap water quality in CHINO, California
Tap water in CHINO, California receives a grade of D (60/100) from TapWaterSafety.org. It's served by CHINO, 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's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CHINO.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.7 ppb, 425x 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 16.8 ppb, 281x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for CHINO, CITY OF (system ID CA3610012) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CHINO
Filters matched to the specific contaminants in CHINO's water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
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'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 |
1.7 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 425× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
16.8 ppb | 0.06 | — | — | — | — | — | 281× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
35.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 234× over |
| Chromium (hexavalent) Heavy metal |
3.71 ppb | 0.02 | — | — | — | — | — | 186× over |
| Bromodichloromethane Disinfection byproduct |
8.18 ppb | 0.06 | — | — | — | — | — | 136× over |
| Dibromochloromethane Disinfection byproduct |
10.5 ppb | 0.1 | — | — | — | — | — | 105× over |
| Dibromoacetic acid Disinfection byproduct |
1.76 ppb | 0.03 | — | — | — | — | — | 59× over |
| Trichloroacetic acid Disinfection byproduct |
2.1 ppb | 0.1 | — | — | — | — | — | 21× over |
| Chloroform Disinfection byproduct |
7.95 ppb | 0.4 | — | — | — | — | — | 20× over |
| Bromoform Disinfection byproduct |
8.37 ppb | 0.5 | — | — | — | — | — | 17× over |
| Nitrate Inorganic |
2.41 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 17× over |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.0092 ppb | 0.0017 | 0.2 | — | — | — | — | 5.4× over |
| Uranium Radiological |
1.97 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 4.6× over |
| Dichloroacetic acid Disinfection byproduct |
0.861 ppb | 0.2 | — | — | — | — | — | 4.3× over |
| Perchlorate Disinfection byproduct |
0.736 ppb | 1.0 | — | — | — | — | — | Below guideline |
| 1,2,3-Trichloropropane Other |
0.000354 ppb | 0.0007 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.016 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Vanadium Other |
4.7 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
3.18 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
14.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.503 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0205 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0375 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.377 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.105 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
9.16 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.214 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, CITY OF.