What was found in Chino'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 49720 µg/L 497% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 26000 µg/L 260% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2017 | 2/2 | SYR4 |
| Fluoride | 240 µg/L 6% of the EPA limit 4000 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 2/2 | SYR4 |
| Barium | 170 µg/L 8.5% of the EPA limit 2000 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 2/2 | SYR4 |
| Copper | 78.99 µg/L 6.1% of the EPA limit 1300 µg/L Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 1/2 | SYR4 |
| TTHM | 66 µg/L 83% of the EPA limit 80 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 26 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Bromoform | 25 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 12 µg/L 20% of the EPA limit 60 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2019
Highest in the city: 22.35 µg/L — CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 21.06 µg/L No EPA limit set Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 1/2 | SYR4 |
| Chloroform | 21 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 1/2 | SYR4 |
| Chromium | 12.85 µg/L 13% of the EPA limit 100 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 2/2 | SYR4 |
| Selenium | 11.53 µg/L 23% of the EPA limit 50 µg/L Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 8.8357 µg/L 29% of the EPA limit 30 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 1/2 | SYR4 |
| Dibromoacetic Acid | 6.445 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 5.695 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Arsenic | 4.23 µg/L 42% of the EPA limit 10 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.04 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 3.285 µg/L 66% of the EPA limit 5 µg/L Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 1/2 | SYR4 |
| Picloram | 2.095 µg/L 0.4% of the EPA limit 500 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 1/2 | SYR4 |
| Trichloroethylene | 1.765 µg/L 35% of the EPA limit 5 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 2/2 | SYR4 |
| Cadmium | 1.71 µg/L 34% of the EPA limit 5 µg/L Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 1/2 | SYR4 |
| Mercury | 1.7 µg/L 85% of the EPA limit 2 µg/L Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.36 µg/L No EPA limit set Main supplier: CHINO, CITY OF · 86,435 people · 2019 | 2/2 | SYR4 |
| Nitrite | 0.9340 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2018 | 1/2 | SYR4 |
| Asbestos | 0.1980 MFL 2.8% of the EPA limit 7 MFL Highest in the city: CALIFORNIA INSTITUTION FOR MEN · 10,667 people · 2012 | 1/2 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0808 µg/L 40% of the EPA limit 0.2000 µg/L Main supplier: CHINO, CITY OF · 86,435 people · 2018 | 1/2 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: CHINO, CITY OF · 86,435 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 Chino
| Supplier | Population served |
|---|---|
| CHINO, CITY OF | 86,435 |
| CALIFORNIA INSTITUTION FOR MEN | 10,667 |
Frequently asked questions about Chino tap water
Is Chino tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Chino. 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?
2 public water suppliers report drinking-water monitoring for Chino, California to the EPA. Each is listed above with its population served.
What contaminants are in Chino's water?
The contaminants EPA monitoring detected in Chino include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper. 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.