What was found in ZIP 92251
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 | 420 µg/L 4.2% of the EPA limit 10000 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 1/2 | SYR4 |
| Nitrate | 410 µg/L 4.1% of the EPA limit 10000 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 1/2 | SYR4 |
| Fluoride | 375.5 µg/L 9.4% of the EPA limit 4000 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 1/2 | SYR4 |
| Barium | 129 µg/L 6.5% of the EPA limit 2000 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 1/2 | SYR4 |
| TTHM | 110.71 µg/L 138% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 2/2 | SYR4 |
| Lithium | 61 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2025
Highest in the ZIP: 78.8 µg/L — CENTINELA STATE PRISON · 4,100 people · 2024 | 2/2 | UCMR-5 |
| Chloroform | 43.5 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.15 µg/L 49% of the EPA limit 60 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019
Highest in the ZIP: 40.449999999999996 µg/L — CENTINELA STATE PRISON · 4,100 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 37 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 26.7 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 13.869999999999985 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019
Highest in the ZIP: 22.959999999999965 µg/L — CENTINELA STATE PRISON · 4,100 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 1.08 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019
Highest in the ZIP: 12.249999999999996 µg/L — CENTINELA STATE PRISON · 4,100 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 9.498499999999998 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019
Highest in the ZIP: 10.539999999999997 µg/L — CENTINELA STATE PRISON · 4,100 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 7.4799999999999995 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019
Highest in the ZIP: 8.209999999999997 µg/L — CENTINELA STATE PRISON · 4,100 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 6.9099999999999975 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019
Highest in the ZIP: 8.15 µg/L — CENTINELA STATE PRISON · 4,100 people · 2019 | 2/2 | SYR4 |
| Bromoform | 4.703999999999995 µg/L No EPA limit set Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2.6 µg/L 26% of the EPA limit 10 µg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: IMPERIAL, CITY OF · 21,591 people · 2025
Highest in the ZIP: 0.0016 mg/L — CENTINELA STATE PRISON · 4,100 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 92251
| Supplier | State | Population served |
|---|---|---|
| IMPERIAL, CITY OF | CA | 21,591 |
| CENTINELA STATE PRISON | CA | 4,100 |
Frequently asked questions about ZIP 92251 tap water
Is the tap water in ZIP 92251 safe to drink?
EPA testing detected 18 contaminants across the water suppliers serving ZIP 92251. 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 92251?
2 public water suppliers report EPA drinking-water monitoring for ZIP 92251. Each is listed above with its population served.
What contaminants are in ZIP 92251's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.