What was found in ZIP 91765
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| TTHM | 63.38 µg/L 79% of the EPA limit 80 µg/L Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Lithium | 50.1 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2024 | 2/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 33.34 µg/L 56% of the EPA limit 60 µg/L Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 22.34 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019
Highest in the ZIP: 32.7 µg/L — WESTERN MWD · 86,062 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 21.925 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 20.84 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Chloroform | 18.585 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 13.385 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Bromoform | 9.06 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019
Highest in the ZIP: 12 µg/L — WESTERN MWD · 86,062 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 8.942 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 8.1395 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 2.6945 µg/L No EPA limit set Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2019
Highest in the ZIP: 3.195 µg/L — WESTERN MWD · 86,062 people · 2019 | 2/2 | SYR4 |
| Pfpea | 0.0047 µg/L No EPA limit set Highest in the ZIP: WESTERN MWD · 86,062 people · 2023 | 1/2 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set Highest in the ZIP: WESTERN MWD · 86,062 people · 2023 | 1/2 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Highest in the ZIP: WESTERN MWD · 86,062 people · 2023 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WALNUT VALLEY WATER DISTRICT · 100,941 people · 2024
Highest in the ZIP: 0.0013 mg/L — WESTERN MWD · 86,062 people · 2025 | 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 95th percentile of the
system's samples — 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, Lithium, Total Haloacetic Acids (HAA5), Monochloroacetic Acid, Dibromochloromethane, and others across this ZIP's suppliers. The full list with levels and sources is above.