What was found in ZIP 92377
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 451999.99999999994 µg/L 4520% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Nitrate | 8588 µg/L 86% of the EPA limit 10000 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Fluoride | 410 µg/L 10% of the EPA limit 4000 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Copper | 83 µg/L 6.4% of the EPA limit 1300 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
Highest in the ZIP: 140 µg/L — RIALTO, CITY OF · 54,453 people · 2019 | 2/2 | SYR4 |
| TTHM | 65.17999999999999 µg/L 81% of the EPA limit 80 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Toluene | 1.7 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
Highest in the ZIP: 49.599999999999994 µg/L — RIALTO, CITY OF · 54,453 people · 2019 | 2/2 | SYR4 |
| Barium | 46.29999999999998 µg/L 2.3% of the EPA limit 2000 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 23.574999999999996 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 19.389999999999997 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Chloroform | 18.025 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16.039999999999978 µg/L 27% of the EPA limit 60 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Bromoform | 14.479999999999995 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 13.2 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 11 µg/L 183% of the EPA limit, at the 95th percentile of samples — 6 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 10.653499999999996 µg/L 36% of the EPA limit 30 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Arsenic | 9.2 µg/L 92% of the EPA limit 10 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 8.239999999999995 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 6.9 µg/L 138% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 6.675 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.814999999999999 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Styrene | 3.309999999999999 µg/L 3.3% of the EPA limit 100 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Chromium | 3.1599999999999997 µg/L 3.2% of the EPA limit 100 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 3.075 µg/L 62% of the EPA limit 5 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Xylenes, Total | 1.995 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 1.728 pCi/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2016 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.2899999999999998 µg/L No EPA limit set Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
Highest in the ZIP: 1.69 µg/L — RIALTO, CITY OF · 54,453 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 1.25 µg/L 25% of the EPA limit 5 µg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019 | 2/2 | SYR4 |
| Ethylbenzene | 1.233 µg/L 0.2% of the EPA limit 700 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| 1,2-Dichloropropane | 0.9410 µg/L 19% of the EPA limit 5 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| 1,2-Dichloroethane | 0.8000 µg/L 16% of the EPA limit 5 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| 1,1-Dichloroethylene | 0.5750 µg/L 8.2% of the EPA limit 7 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.5600 µg/L 0.8% of the EPA limit 70 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| 1,1,2-Trichloroethane | 0.5600 µg/L 11% of the EPA limit 5 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0220 µg/L 11% of the EPA limit 0.2000 µg/L Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0180 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0170 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0073 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0057 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| PFBS | 0.0046 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| Pfhpa | 0.0035 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0035 µg/L No EPA limit set Highest in the ZIP: RIALTO, CITY OF · 54,453 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WEST VALLEY WATER DISTRICT · 104,498 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.
Water suppliers serving ZIP 92377
| Supplier | State | Population served |
|---|---|---|
| WEST VALLEY WATER DISTRICT | CA | 104,498 |
| RIALTO, CITY OF | CA | 54,453 |
Frequently asked questions about ZIP 92377 tap water
Is the tap water in ZIP 92377 safe to drink?
EPA testing detected 42 contaminants across the water suppliers serving ZIP 92377. 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 92377?
2 public water suppliers report EPA drinking-water monitoring for ZIP 92377. Each is listed above with its population served.
What contaminants are in ZIP 92377's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.