What was found in ZIP 91780
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 | 790000 µg/L 7900% of the EPA limit, in the worst sample — 10000 µg/L | 4/5 | SYR4 |
| Nitrate | 16600 µg/L 166% of the EPA limit, in the worst sample — 10000 µg/L | 4/5 | SYR4 |
| Fluoride | 1080 µg/L 27% of the EPA limit 4000 µg/L | 4/5 | SYR4 |
| Copper | 379 µg/L 29% of the EPA limit 1300 µg/L | 2/5 | SYR4 |
| TTHM | 377 µg/L 471% of the EPA limit, in the worst sample — 80 µg/L | 5/5 | SYR4 |
| Chloroform | 349 µg/L No EPA limit set | 4/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 92.4 µg/L 154% of the EPA limit, in the worst sample — 60 µg/L | 5/5 | SYR4 |
| Lithium | 91.9 µg/L No EPA limit set | 1/5 | UCMR-5 |
| Trichloroacetic Acid | 58.5 µg/L No EPA limit set | 3/5 | SYR4 |
| Barium | 50.8 µg/L 2.5% of the EPA limit 2000 µg/L | 1/5 | SYR4 |
| Chromium | 44 µg/L 44% of the EPA limit 100 µg/L | 3/5 | SYR4 |
| Combined Uranium | 40.23 µg/L 134% of the EPA limit, in the worst sample — 30 µg/L | 4/5 | SYR4 |
| Dichloroacetic Acid | 33.9 µg/L No EPA limit set | 3/5 | SYR4 |
| Bromodichloromethane | 26.8 µg/L No EPA limit set | 5/5 | SYR4 |
| Lead | 22.49 µg/L 150% of the EPA limit, in the worst sample — 15 µg/L | 2/5 | SYR4 |
| Trichloroethylene | 20 µg/L 400% of the EPA limit, in the worst sample — 5 µg/L | 4/5 | SYR4 |
| Dibromochloromethane | 17.2 µg/L No EPA limit set | 5/5 | SYR4 |
| Tetrachloroethylene | 17 µg/L 340% of the EPA limit, in the worst sample — 5 µg/L | 4/5 | SYR4 |
| Monochloroacetic Acid | 8.47 µg/L No EPA limit set | 3/5 | SYR4 |
| Bromoform | 8.2 µg/L No EPA limit set | 5/5 | SYR4 |
| Dibromoacetic Acid | 4.8 µg/L No EPA limit set | 5/5 | SYR4 |
| Monobromoacetic Acid | 3.9 µg/L No EPA limit set | 1/5 | SYR4 |
| Carbon Tetrachloride | 3.5 µg/L 70% of the EPA limit 5 µg/L | 2/5 | SYR4 |
| Dichloromethane | 3.4 µg/L 68% of the EPA limit 5 µg/L | 1/5 | SYR4 |
| Arsenic | 3.2 µg/L 32% of the EPA limit 10 µg/L | 2/5 | SYR4 |
| 1,2-Dichloropropane | 2.9 µg/L 58% of the EPA limit 5 µg/L | 1/5 | SYR4 |
| 1,1-Dichloroethylene | 2.3 µg/L 33% of the EPA limit 7 µg/L | 1/5 | SYR4 |
| Gross Beta Particle Activity | 2.1 pCi/L No EPA limit set | 1/5 | SYR4 |
| Mercury | 2.1 µg/L 105% of the EPA limit, in the worst sample — 2 µg/L | 1/5 | SYR4 |
| cis-1,2-Dichloroethylene | 1.1 µg/L 1.6% of the EPA limit 70 µg/L | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 1.095 pCi/L 22% of the EPA limit 5 pCi/L | 1/5 | SYR4 |
| 2,4-D | 0.9000 µg/L 1.3% of the EPA limit 70 µg/L | 1/5 | SYR4 |
| trans-1,2-Dichloroethylene | 0.5300 µg/L 0.5% of the EPA limit 100 µg/L | 1/5 | SYR4 |
| PFOS | 0.0220 µg/L No EPA limit set | 1/5 | UCMR-5 |
| PFHXS | 0.0070 µg/L No EPA limit set | 1/5 | UCMR-5 |
| PFOA | 0.0055 µg/L No EPA limit set | 1/5 | UCMR-5 |
| Pfba | 0.0053 µg/L No EPA limit set | 1/5 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L | 5/5 | 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 91780
| Supplier | State | Population served |
|---|---|---|
| CAL/AM WATER COMPANY - SAN MARINO | CA | 47,995 |
| GSWC-SOUTH ARCADIA | CA | 27,072 |
| SUNNY SLOPE WATER CO. | CA | 25,252 |
| CAL-AM WATER COMPANY - EAST PASADENA | CA | 9,949 |
| BRYAN CO. RWS & SWMD #2 | OK | 6,270 |
Frequently asked questions about ZIP 91780 tap water
Is the tap water in ZIP 91780 safe to drink?
EPA testing detected 38 contaminants across the water suppliers serving ZIP 91780. 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 91780?
5 public water suppliers report EPA drinking-water monitoring for ZIP 91780. Each is listed above with its population served.
What contaminants are in ZIP 91780'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.