What was found in ZIP 91761
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 | 14000 µg/L 140% of the EPA limit, in the worst sample — 10000 µg/L | 1/2 | SYR4 |
| Nitrate-Nitrite | 12000 µg/L 120% of the EPA limit, in the worst sample — 10000 µg/L | 1/2 | SYR4 |
| Nitrite | 4900 µg/L 490% of the EPA limit, in the worst sample — 1000 µg/L | 1/2 | SYR4 |
| Fluoride | 500 µg/L 13% of the EPA limit 4000 µg/L | 1/2 | SYR4 |
| Barium | 140 µg/L 7% of the EPA limit 2000 µg/L | 1/2 | SYR4 |
| TTHM | 77 µg/L 96% of the EPA limit 80 µg/L | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 52 µg/L 87% of the EPA limit 60 µg/L | 2/2 | SYR4 |
| Monochloroacetic Acid | 44 µg/L No EPA limit set | 2/2 | SYR4 |
| Chloroform | 30 µg/L No EPA limit set | 2/2 | SYR4 |
| Bromoform | 29 µg/L No EPA limit set | 2/2 | SYR4 |
| Dibromochloromethane | 28 µg/L No EPA limit set | 2/2 | SYR4 |
| Bromodichloromethane | 23 µg/L No EPA limit set | 2/2 | SYR4 |
| Lithium | 16 µg/L No EPA limit set | 1/2 | UCMR-5 |
| Dibromoacetic Acid | 13 µg/L No EPA limit set | 2/2 | SYR4 |
| Chromium | 8.8 µg/L 8.8% of the EPA limit 100 µg/L | 1/2 | SYR4 |
| Trichloroacetic Acid | 7.9 µg/L No EPA limit set | 2/2 | SYR4 |
| Dichloroacetic Acid | 7.8 µg/L No EPA limit set | 2/2 | SYR4 |
| Monobromoacetic Acid | 7.8 µg/L No EPA limit set | 2/2 | SYR4 |
| Arsenic | 2.4 µg/L 24% of the EPA limit 10 µg/L | 1/2 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.1600 µg/L 80% of the EPA limit 0.2000 µg/L | 1/2 | SYR4 |
| PFOA | 0.0300 µg/L No EPA limit set | 1/2 | UCMR-5 |
| Ethylene Dibromide | 0.0210 µg/L 42% of the EPA limit 0.0500 µg/L | 1/2 | SYR4 |
| Pfhxa | 0.0071 µg/L No EPA limit set | 1/2 | UCMR-5 |
| Pfpea | 0.0067 µg/L No EPA limit set | 2/2 | UCMR-5 |
| Pfba | 0.0064 µg/L No EPA limit set | 1/2 | UCMR-5 |
| PFOS | 0.0052 µg/L No EPA limit set | 1/2 | UCMR-5 |
| PFHXS | 0.0042 µg/L No EPA limit set | 2/2 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set | 1/2 | UCMR-5 |
| Lead | 0.0013 mg/L 8.7% 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 91761
| Supplier | State | Population served |
|---|---|---|
| ONTARIO MUNICIPAL UTILITIES COMPANY | CA | 185,010 |
| WESTERN MWD | CA | 86,062 |
Frequently asked questions about ZIP 91761 tap water
Is the tap water in ZIP 91761 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 91761. 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 91761?
2 public water suppliers report EPA drinking-water monitoring for ZIP 91761. Each is listed above with its population served.
What contaminants are in ZIP 91761's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Nitrite, Fluoride, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.