What was found in ZIP 91710
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 83700 µg/L 837% of the EPA limit, in the worst sample — 10000 µg/L | 4/4 | SYR4 |
| Nitrate-Nitrite | 27000 µg/L 270% of the EPA limit, in the worst sample — 10000 µg/L | 4/4 | SYR4 |
| Fluoride | 600 µg/L 15% of the EPA limit 4000 µg/L | 4/4 | SYR4 |
| Barium | 180 µg/L 9% of the EPA limit 2000 µg/L | 3/4 | SYR4 |
| Chromium | 180 µg/L 180% of the EPA limit, in the worst sample — 100 µg/L | 4/4 | SYR4 |
| Trichloroethylene | 130 µg/L 2600% of the EPA limit, in the worst sample — 5 µg/L | 4/4 | SYR4 |
| Copper | 110 µg/L 8.5% of the EPA limit 1300 µg/L | 2/4 | SYR4 |
| TTHM | 96 µg/L 120% of the EPA limit, in the worst sample — 80 µg/L | 4/4 | SYR4 |
| 1,1-Dichloroethylene | 61 µg/L 871% of the EPA limit, in the worst sample — 7 µg/L | 2/4 | SYR4 |
| Dibromochloromethane | 35 µg/L No EPA limit set | 4/4 | SYR4 |
| Tetrachloroethylene | 34 µg/L 680% of the EPA limit, in the worst sample — 5 µg/L | 3/4 | SYR4 |
| Selenium | 33.6 µg/L 67% of the EPA limit 50 µg/L | 2/4 | SYR4 |
| Bromoform | 32 µg/L No EPA limit set | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27 µg/L 45% of the EPA limit 60 µg/L | 4/4 | SYR4 |
| Chloroform | 25 µg/L No EPA limit set | 3/4 | SYR4 |
| Bromodichloromethane | 24 µg/L No EPA limit set | 3/4 | SYR4 |
| Monochloroacetic Acid | 21.9 µg/L No EPA limit set | 1/4 | SYR4 |
| Dichloroacetic Acid | 16 µg/L No EPA limit set | 4/4 | SYR4 |
| Trichloroacetic Acid | 12 µg/L No EPA limit set | 4/4 | SYR4 |
| Arsenic | 11 µg/L 110% of the EPA limit, in the worst sample — 10 µg/L | 4/4 | SYR4 |
| Dibromoacetic Acid | 10.4 µg/L No EPA limit set | 4/4 | SYR4 |
| Combined Uranium | 9.983 µg/L 33% of the EPA limit 30 µg/L | 2/4 | SYR4 |
| Lithium | 9.3 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Lead | 8.4 µg/L 56% of the EPA limit 15 µg/L | 1/4 | SYR4 |
| Monobromoacetic Acid | 2.4 µg/L No EPA limit set | 4/4 | SYR4 |
| Picloram | 2.1 µg/L 0.4% of the EPA limit 500 µg/L | 1/4 | SYR4 |
| Cadmium | 1.71 µg/L 34% of the EPA limit 5 µg/L | 1/4 | SYR4 |
| Mercury | 1.7 µg/L 85% of the EPA limit 2 µg/L | 1/4 | SYR4 |
| Thallium, Total | 1.2 µg/L 60% of the EPA limit 2 µg/L | 1/4 | SYR4 |
| Nitrite | 0.9700 µg/L 0.1% of the EPA limit 1000 µg/L | 1/4 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.5300 µg/L 265% of the EPA limit, in the worst sample — 0.2000 µg/L | 3/4 | SYR4 |
| Asbestos | 0.1980 MFL 2.8% of the EPA limit 7 MFL | 1/4 | SYR4 |
| PFOS | 0.0180 µg/L No EPA limit set | 2/4 | UCMR-5 |
| Pfba | 0.0110 µg/L No EPA limit set | 1/4 | UCMR-5 |
| PFHXS | 0.0079 µg/L No EPA limit set | 2/4 | UCMR-5 |
| PFOA | 0.0071 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Pfpea | 0.0044 µg/L No EPA limit set | 2/4 | UCMR-5 |
| Pfhxa | 0.0041 µg/L No EPA limit set | 2/4 | UCMR-5 |
| PFBS | 0.0032 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L | 4/4 | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 91710
| Supplier | State | Population served |
|---|---|---|
| POMONA - CITY, WATER DEPT. | CA | 151,713 |
| CHINO, CITY OF | CA | 86,435 |
| MONTE VISTA WD | CA | 56,017 |
| CALIFORNIA INSTITUTION FOR MEN | CA | 10,667 |
Frequently asked questions about ZIP 91710 tap water
Is the tap water in ZIP 91710 safe to drink?
EPA testing detected 40 contaminants across the water suppliers serving ZIP 91710. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 91710?
4 public water suppliers report EPA drinking-water monitoring for ZIP 91710. Each is listed above with its population served.
What contaminants are in ZIP 91710's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Barium, Chromium, and others across this ZIP's suppliers. The full list with levels and sources is above.