What was found in ZIP 92557
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-Nitrite | 930000 µg/L 9300% of the EPA limit, in the worst sample — 10000 µg/L | 1/2 | SYR4 |
| Nitrate | 13000 µg/L 130% of the EPA limit, in the worst sample — 10000 µg/L | 1/2 | SYR4 |
| Barium | 1450 µg/L 73% of the EPA limit 2000 µg/L | 1/2 | SYR4 |
| Fluoride | 1300 µg/L 33% of the EPA limit 4000 µg/L | 1/2 | SYR4 |
| Copper | 150 µg/L 12% of the EPA limit 1300 µg/L | 1/2 | SYR4 |
| TTHM | 120 µg/L 150% of the EPA limit, in the worst sample — 80 µg/L | 2/2 | SYR4 |
| Chloroform | 72 µg/L No EPA limit set | 2/2 | SYR4 |
| Bromoform | 70 µg/L No EPA limit set | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 70 µg/L 117% of the EPA limit, in the worst sample — 60 µg/L | 2/2 | SYR4 |
| Dibromochloromethane | 54 µg/L No EPA limit set | 2/2 | SYR4 |
| Monochloroacetic Acid | 53 µg/L No EPA limit set | 2/2 | SYR4 |
| Lithium | 39 µg/L No EPA limit set | 2/2 | UCMR-5 |
| Dichloroacetic Acid | 29 µg/L No EPA limit set | 2/2 | SYR4 |
| Combined Uranium | 28.459 µg/L 95% of the EPA limit 30 µg/L | 1/2 | SYR4 |
| Trichloroacetic Acid | 28 µg/L No EPA limit set | 2/2 | SYR4 |
| Bromodichloromethane | 26 µg/L No EPA limit set | 2/2 | SYR4 |
| Dibromoacetic Acid | 20 µg/L No EPA limit set | 2/2 | SYR4 |
| Lead | 15 µg/L 100% of the EPA limit 15 µg/L | 1/2 | SYR4 |
| Gross Beta Particle Activity | 13.3 pCi/L No EPA limit set | 1/2 | SYR4 |
| Arsenic | 13 µg/L 130% of the EPA limit, in the worst sample — 10 µg/L | 1/2 | SYR4 |
| Selenium | 12 µg/L 24% of the EPA limit 50 µg/L | 1/2 | SYR4 |
| Cyanide | 10.1 µg/L 5.1% of the EPA limit 200 µg/L | 1/2 | SYR4 |
| Monobromoacetic Acid | 7.4 µg/L No EPA limit set | 2/2 | SYR4 |
| Tetrachloroethylene | 2.5 µg/L 50% of the EPA limit 5 µg/L | 1/2 | SYR4 |
| Trichloroethylene | 1.3 µg/L 26% of the EPA limit 5 µg/L | 1/2 | SYR4 |
| Nitrite | 0.5000 µg/L 0.1% of the EPA limit 1000 µg/L | 1/2 | SYR4 |
| Cadmium | 0.3900 µg/L 7.8% of the EPA limit 5 µg/L | 1/2 | SYR4 |
| Pfpea | 0.0047 µg/L No EPA limit set | 1/2 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set | 1/2 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set | 1/2 | UCMR-5 |
| Lead | 0.0028 mg/L 19% of the EPA limit 0.0150 mg/L | 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 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 92557
| Supplier | State | Population served |
|---|---|---|
| EASTERN MUNICIPAL WD | CA | 666,581 |
| WESTERN MWD | CA | 86,062 |
Frequently asked questions about ZIP 92557 tap water
Is the tap water in ZIP 92557 safe to drink?
EPA testing detected 31 contaminants across the water suppliers serving ZIP 92557. 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 92557?
2 public water suppliers report EPA drinking-water monitoring for ZIP 92557. Each is listed above with its population served.
What contaminants are in ZIP 92557's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Barium, Fluoride, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.