What was found in ZIP 91786
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 |
|---|---|---|---|
| Nitrate | 21470 µg/L 215% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 21000 µg/L 210% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Fluoride | 420 µg/L 11% of the EPA limit 4000 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Copper | 380 µg/L 29% of the EPA limit 1300 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| TTHM | 71 µg/L 89% of the EPA limit 80 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 28 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Bromoform | 25 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 19 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16.94999999999999 µg/L 28% of the EPA limit 60 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Chloroform | 15 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 14 µg/L 280% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 9.24 pCi/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2017 | 1/1 | SYR4 |
| Trichloroacetic Acid | 8.459999999999999 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 8.1205 µg/L 27% of the EPA limit 30 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2017 | 1/1 | SYR4 |
| Dibromoacetic Acid | 7.5 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 7.2 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Arsenic | 4.6049999999999995 µg/L 46% of the EPA limit 10 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 2.13 µg/L 43% of the EPA limit 5 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.2600 µg/L 130% of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2019 | 1/1 | SYR4 |
| Pfpea | 0.0057 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0055 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: UPLAND, CITY OF · 78,376 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: UPLAND, CITY OF · 78,376 people · 2023 | 1/1 | 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 91786
| Supplier | State | Population served |
|---|---|---|
| UPLAND, CITY OF | CA | 78,376 |
Frequently asked questions about ZIP 91786 tap water
Is the tap water in ZIP 91786 safe to drink?
EPA testing detected 24 contaminants across the water suppliers serving ZIP 91786. 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 91786?
1 public water supplier report EPA drinking-water monitoring for ZIP 91786. Each is listed above with its population served.
What contaminants are in ZIP 91786's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.