What was found in ZIP 91941
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 |
|---|---|---|---|
| Nitrate-Nitrite | 510000 µg/L 5100% of the EPA limit, in the worst sample — 10000 µg/L | 1/3 | SYR4 |
| Nitrate | 3435.2 µg/L 34% of the EPA limit 10000 µg/L | 2/3 | SYR4 |
| Fluoride | 1020 µg/L 26% of the EPA limit 4000 µg/L | 2/3 | SYR4 |
| Chlorite | 1000 µg/L 100% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Barium | 146 µg/L 7.3% of the EPA limit 2000 µg/L | 2/3 | SYR4 |
| TTHM | 126 µg/L 158% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Combined Uranium | 73.01 µg/L 243% of the EPA limit, in the worst sample — 30 µg/L | 2/3 | SYR4 |
| Lithium | 65 µg/L No EPA limit set | 3/3 | UCMR-5 |
| Chloroform | 53 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromochloromethane | 39.9 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromodichloromethane | 39.4 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromoform | 38.5 µg/L No EPA limit set | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 37.7 µg/L 63% of the EPA limit 60 µg/L | 3/3 | SYR4 |
| Gross Beta Particle Activity | 30.7 pCi/L No EPA limit set | 1/3 | SYR4 |
| Dichloroacetic Acid | 23.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromoacetic Acid | 14.8 µg/L No EPA limit set | 3/3 | SYR4 |
| Trichloroacetic Acid | 11.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromate | 10.2 µg/L 102% of the EPA limit, in the worst sample — 10 µg/L | 2/3 | SYR4 |
| Arsenic | 7.34 µg/L 73% of the EPA limit 10 µg/L | 2/3 | SYR4 |
| Selenium | 6.82 µg/L 14% of the EPA limit 50 µg/L | 1/3 | SYR4 |
| Monobromoacetic Acid | 6.41 µg/L No EPA limit set | 3/3 | SYR4 |
| Monochloroacetic Acid | 5.4 µg/L No EPA limit set | 2/3 | SYR4 |
| Trichloroethylene | 5.05 µg/L 101% of the EPA limit, in the worst sample — 5 µg/L | 1/3 | SYR4 |
| Tetrachloroethylene | 4.47 µg/L 89% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Mercury | 1.9 µg/L 95% of the EPA limit 2 µg/L | 2/3 | SYR4 |
| cis-1,2-Dichloroethylene | 1.01 µg/L 1.4% of the EPA limit 70 µg/L | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 3/3 | 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 91941
| Supplier | State | Population served |
|---|---|---|
| SAN DIEGO, CITY OF | CA | 1,385,379 |
| HELIX WATER DISTRICT | CA | 277,668 |
| OTAY WATER DISTRICT | CA | 238,008 |
Frequently asked questions about ZIP 91941 tap water
Is the tap water in ZIP 91941 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 91941. 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 91941?
3 public water suppliers report EPA drinking-water monitoring for ZIP 91941. Each is listed above with its population served.
What contaminants are in ZIP 91941's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Chlorite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.