What was found in ZIP 92091
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-Nitrite | 746999.9999999999 µg/L 7470% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Nitrate | 860 µg/L 8.6% of the EPA limit 10000 µg/L Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Fluoride | 764.4999999999995 µg/L 19% of the EPA limit 4000 µg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| Chlorite | 460 µg/L 46% of the EPA limit 1000 µg/L Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Copper | 157 µg/L 12% of the EPA limit 1300 µg/L Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Barium | 119.5 µg/L 6% of the EPA limit 2000 µg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| TTHM | 64.08000000000006 µg/L 80% of the EPA limit 80 µg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 68 µg/L — SANTA FE I.D. · 21,578 people · 2019 | 2/2 | SYR4 |
| Lithium | 54.1 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2024 | 2/2 | UCMR-5 |
| Lead | 39 µg/L 260% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Chloroform | 32.59500000000001 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25.79499999999999 µg/L 43% of the EPA limit 60 µg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 20 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 25 µg/L — SANTA FE I.D. · 21,578 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 21 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 22 µg/L — SANTA FE I.D. · 21,578 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 15.975 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| Bromoform | 8.245 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 11 µg/L — SANTA FE I.D. · 21,578 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 6.284999999999997 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 9.3 µg/L — SANTA FE I.D. · 21,578 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 4.994999999999999 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 6.6 µg/L — SANTA FE I.D. · 21,578 people · 2019 | 2/2 | SYR4 |
| Selenium | 6.1 µg/L 12% of the EPA limit 50 µg/L Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 4.95 pCi/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 5.8500000000000005 pCi/L — SANTA FE I.D. · 21,578 people · 2014 | 2/2 | SYR4 |
| Combined Uranium | 3.5313 µg/L 12% of the EPA limit 30 µg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2019
Highest in the ZIP: 4.99895 µg/L — SANTA FE I.D. · 21,578 people · 2014 | 2/2 | SYR4 |
| Arsenic | 4.1899999999999995 µg/L 42% of the EPA limit 10 µg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 3.2999999999999994 µg/L No EPA limit set Main supplier: OLIVENHAIN MWD · 86,458 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2019 | 1/2 | SYR4 |
| Pfhxa | 0.0045 µg/L No EPA limit set Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0043 µg/L No EPA limit set Highest in the ZIP: SANTA FE I.D. · 21,578 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: OLIVENHAIN MWD · 86,458 people · 2025
Highest in the ZIP: 0.0017 mg/L — SANTA FE I.D. · 21,578 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 92091
| Supplier | State | Population served |
|---|---|---|
| OLIVENHAIN MWD | CA | 86,458 |
| SANTA FE I.D. | CA | 21,578 |
Frequently asked questions about ZIP 92091 tap water
Is the tap water in ZIP 92091 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 92091. 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 92091?
2 public water suppliers report EPA drinking-water monitoring for ZIP 92091. Each is listed above with its population served.
What contaminants are in ZIP 92091's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Chlorite, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.