What was found in ZIP 91765
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 |
|---|---|---|---|
| TTHM | 88.7 µg/L 111% of the EPA limit, in the worst sample — 80 µg/L | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 52 µg/L 87% of the EPA limit 60 µg/L | 2/2 | SYR4 |
| Lithium | 50.1 µg/L No EPA limit set | 2/2 | UCMR-5 |
| Monochloroacetic Acid | 44 µg/L No EPA limit set | 2/2 | SYR4 |
| Chloroform | 43.6 µg/L No EPA limit set | 2/2 | SYR4 |
| Bromodichloromethane | 31.7 µg/L No EPA limit set | 2/2 | SYR4 |
| Dibromochloromethane | 25.6 µg/L No EPA limit set | 2/2 | SYR4 |
| Dichloroacetic Acid | 21.1 µg/L No EPA limit set | 2/2 | SYR4 |
| Trichloroacetic Acid | 18.1 µg/L No EPA limit set | 2/2 | SYR4 |
| Dibromoacetic Acid | 15.3 µg/L No EPA limit set | 2/2 | SYR4 |
| Bromoform | 15 µg/L No EPA limit set | 2/2 | SYR4 |
| Monobromoacetic Acid | 4.16 µg/L No EPA limit set | 2/2 | 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 | 0.0013 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 91765
| Supplier | State | Population served |
|---|---|---|
| WALNUT VALLEY WATER DISTRICT | CA | 100,941 |
| WESTERN MWD | CA | 86,062 |
Frequently asked questions about ZIP 91765 tap water
Is the tap water in ZIP 91765 safe to drink?
EPA testing detected 16 contaminants across the water suppliers serving ZIP 91765. 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 91765?
2 public water suppliers report EPA drinking-water monitoring for ZIP 91765. Each is listed above with its population served.
What contaminants are in ZIP 91765's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Lithium, Monochloroacetic Acid, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.