What was found in ZIP 91755
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 | 580000 µg/L 5800% of the EPA limit, in the worst sample — 10000 µg/L | 2/3 | SYR4 |
| Nitrate | 22000 µg/L 220% of the EPA limit, in the worst sample — 10000 µg/L | 2/3 | SYR4 |
| Fluoride | 970 µg/L 24% of the EPA limit 4000 µg/L | 2/3 | SYR4 |
| Barium | 220 µg/L 11% of the EPA limit 2000 µg/L | 1/3 | SYR4 |
| Tetrachloroethylene | 220 µg/L 4400% of the EPA limit, in the worst sample — 5 µg/L | 2/3 | SYR4 |
| Copper | 190 µg/L 15% of the EPA limit 1300 µg/L | 2/3 | SYR4 |
| Trichloroethylene | 140 µg/L 2800% of the EPA limit, in the worst sample — 5 µg/L | 2/3 | SYR4 |
| 1,1-Dichloroethylene | 64 µg/L 914% of the EPA limit, in the worst sample — 7 µg/L | 2/3 | SYR4 |
| Lithium | 57 µg/L No EPA limit set | 1/3 | UCMR-5 |
| TTHM | 30 µg/L 38% of the EPA limit 80 µg/L | 3/3 | SYR4 |
| trans-1,2-Dichloroethylene | 23 µg/L 23% of the EPA limit 100 µg/L | 2/3 | SYR4 |
| Combined Uranium | 19.37 µg/L 65% of the EPA limit 30 µg/L | 2/3 | SYR4 |
| Arsenic | 18 µg/L 180% of the EPA limit, in the worst sample — 10 µg/L | 2/3 | SYR4 |
| Carbon Tetrachloride | 17 µg/L 340% of the EPA limit, in the worst sample — 5 µg/L | 1/3 | SYR4 |
| Lead | 17 µg/L 113% of the EPA limit, in the worst sample — 15 µg/L | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16 µg/L 27% of the EPA limit 60 µg/L | 3/3 | SYR4 |
| Bromoform | 12 µg/L No EPA limit set | 3/3 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromochloromethane | 10 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromodichloromethane | 9.4 µg/L No EPA limit set | 3/3 | SYR4 |
| Dichloroacetic Acid | 8.8 µg/L No EPA limit set | 1/3 | SYR4 |
| cis-1,2-Dichloroethylene | 6.1 µg/L 8.7% of the EPA limit 70 µg/L | 2/3 | SYR4 |
| Gross Beta Particle Activity | 5.8 pCi/L No EPA limit set | 1/3 | SYR4 |
| Selenium | 5 µg/L 10% of the EPA limit 50 µg/L | 1/3 | SYR4 |
| Trichloroacetic Acid | 4.7 µg/L No EPA limit set | 1/3 | SYR4 |
| Dichloromethane | 4.4 µg/L 88% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| 1,1,2-Trichloroethane | 3.8 µg/L 76% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| 1,2-Dichloroethane | 3.7 µg/L 74% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Monochloroacetic Acid | 3.1 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromoacetic Acid | 2.8 µg/L No EPA limit set | 3/3 | SYR4 |
| Xylenes, Total | 1.2 µg/L 0% of the EPA limit 10000 µg/L | 1/3 | SYR4 |
| Pentachlorophenol | 0.8500 µg/L 85% of the EPA limit 1 µg/L | 1/3 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.6100 µg/L 0.9% of the EPA limit 70 µg/L | 1/3 | SYR4 |
| Toluene | 0.5200 µg/L 0.1% of the EPA limit 1000 µg/L | 2/3 | SYR4 |
| Nitrite | 0.4700 µg/L 0% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Pfba | 0.0100 µg/L No EPA limit set | 3/3 | UCMR-5 |
| Pfpea | 0.0056 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 3/3 | 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 91755
| Supplier | State | Population served |
|---|---|---|
| SAN GABRIEL VALLEY WATER CO.-EL MONTE | CA | 248,000 |
| MONTEREY PARK-CITY, WATER DEPT. | CA | 62,183 |
| GSWC-SOUTH SAN GABRIEL | CA | 26,240 |
Frequently asked questions about ZIP 91755 tap water
Is the tap water in ZIP 91755 safe to drink?
EPA testing detected 38 contaminants across the water suppliers serving ZIP 91755. 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 91755?
3 public water suppliers report EPA drinking-water monitoring for ZIP 91755. Each is listed above with its population served.
What contaminants are in ZIP 91755's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Tetrachloroethylene, and others across this ZIP's suppliers. The full list with levels and sources is above.