What was found in ZIP 91771
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 | 54 µg/L 68% of the EPA limit 80 µg/L Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 24.8 µg/L 41% of the EPA limit 60 µg/L Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 22 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 20 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Chloroform | 16 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Bromoform | 12 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 10 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 7.8 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 7.65 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 4.875 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 4.265 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2019 | 1/1 | SYR4 |
| PFOA | 0.0129 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
| PFOS | 0.0104 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0084 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0064 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0056 mg/L 37% of the EPA limit 0.0150 mg/L Main supplier: GSWC - CLAREMONT · 39,730 people · 2026 | 1/1 | LCR |
| PFBS | 0.0051 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
| Pfhpa | 0.0046 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
| PFHXS | 0.0037 µg/L No EPA limit set Main supplier: GSWC - CLAREMONT · 39,730 people · 2024 | 1/1 | UCMR-5 |
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 91771
| Supplier | State | Population served |
|---|---|---|
| GSWC - CLAREMONT | CA | 39,730 |
Frequently asked questions about ZIP 91771 tap water
Is the tap water in ZIP 91771 safe to drink?
EPA testing detected 19 contaminants across the water suppliers serving ZIP 91771. 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 91771?
1 public water supplier report EPA drinking-water monitoring for ZIP 91771. Each is listed above with its population served.
What contaminants are in ZIP 91771's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Dibromochloromethane, Bromodichloromethane, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.