What was found in ZIP 90274
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 |
|---|---|---|---|
| Fluoride | 885.5 µg/L 22% of the EPA limit 4000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 1/2 | SYR4 |
| Nitrate | 730 µg/L 7.3% of the EPA limit 10000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 730 µg/L 7.3% of the EPA limit 10000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Barium | 247.5 µg/L 12% of the EPA limit 2000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Lithium | 62.5 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2025
Highest in the ZIP: 66.3 µg/L — CALIFORNIA WATER SERVICE CO. - PALOS VER · 71,452 people · 2024 | 2/2 | UCMR-5 |
| TTHM | 47.315 µg/L 59% of the EPA limit 80 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Copper | 42.6548 µg/L 3.3% of the EPA limit 1300 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 23.6 µg/L 39% of the EPA limit 60 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Chloroform | 18.066 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 17.135 µg/L 57% of the EPA limit 30 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Dibromochloromethane | 14.452 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 14 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 13.44 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 10 pCi/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Bromoform | 9.6205 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Selenium | 9.125 µg/L 18% of the EPA limit 50 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Dibromoacetic Acid | 6.96 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 6.035 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019
Highest in the ZIP: 6.8 µg/L — CALIFORNIA WATER SERVICE CO. - PALOS VER · 71,452 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.09045 µg/L 31% of the EPA limit 10 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Monochloroacetic Acid | 2.95 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.84 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 2/2 | SYR4 |
| Chromium | 1.14 µg/L 1.1% of the EPA limit 100 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Lead | 0.7370 µg/L 4.9% of the EPA limit 15 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/2 | SYR4 |
| Antimony, Total | 0.0360 µg/L 0.6% of the EPA limit 6 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Cadmium | 0.0070 µg/L 0.1% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Beryllium, Total | 0.0020 µg/L 0.1% of the EPA limit 4 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/2 | SYR4 |
| Lead | 0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L Main supplier: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2023
Highest in the ZIP: 0.0016 mg/L — CALIFORNIA WATER SERVICE CO. - PALOS VER · 71,452 people · 2023 | 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 90274
| Supplier | State | Population served |
|---|---|---|
| CALIFORNIA WATER SERVICE CO. - HERM/REDO | CA | 96,853 |
| CALIFORNIA WATER SERVICE CO. - PALOS VER | CA | 71,452 |
Frequently asked questions about ZIP 90274 tap water
Is the tap water in ZIP 90274 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 90274. 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 90274?
2 public water suppliers report EPA drinking-water monitoring for ZIP 90274. Each is listed above with its population served.
What contaminants are in ZIP 90274's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, Barium, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.