What was found in ZIP 91901
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 | 6596 µg/L 66% of the EPA limit 10000 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2019 | 1/2 | SYR4 |
| Fluoride | 304 µg/L 7.6% of the EPA limit 4000 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| Barium | 58 µg/L 2.9% of the EPA limit 2000 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| TTHM | 47.5 µg/L 59% of the EPA limit 80 µg/L Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 2/2 | SYR4 |
| Lithium | 47 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2023 | 2/2 | UCMR-5 |
| Combined Uranium | 19.8604 µg/L 66% of the EPA limit 30 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2016 | 1/2 | SYR4 |
| Dibromochloromethane | 18 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Toluene | 18 µg/L 1.8% of the EPA limit 1000 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| Bromodichloromethane | 13 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 10 µg/L 17% of the EPA limit 60 µg/L Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 2/2 | SYR4 |
| Bromoform | 9.52 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 7.4 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.478 pCi/L 37% of the EPA limit 15 pCi/L Highest in the ZIP: Viejas Community System · 9,600 people · 2016 | 1/2 | SYR4 |
| Arsenic | 5.28 µg/L 53% of the EPA limit 10 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| Dichloroacetic Acid | 5.2 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 3.945 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 3.67 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 3.1 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 2.3 µg/L 46% of the EPA limit 5 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| Selenium | 2.14 µg/L 4.3% of the EPA limit 50 µg/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.22025 pCi/L 24% of the EPA limit 5 pCi/L Highest in the ZIP: Viejas Community System · 9,600 people · 2018 | 1/2 | SYR4 |
| PFBS | 0.0243 µg/L No EPA limit set Highest in the ZIP: Viejas Community System · 9,600 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0058 µg/L No EPA limit set Main supplier: PADRE DAM MWD · 93,980 people · 2023 | 1/2 | UCMR-5 |
| Lead | 0.0011 mg/L 7.3% of the EPA limit 0.0150 mg/L Main supplier: PADRE DAM MWD · 93,980 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 91901
| Supplier | State | Population served |
|---|---|---|
| PADRE DAM MWD | CA | 93,980 |
| Viejas Community System | CA | 9,600 |
Frequently asked questions about ZIP 91901 tap water
Is the tap water in ZIP 91901 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 91901. 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 91901?
2 public water suppliers report EPA drinking-water monitoring for ZIP 91901. Each is listed above with its population served.
What contaminants are in ZIP 91901's water?
EPA monitoring detected Nitrate, Fluoride, Barium, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.