What was found in ZIP 90278
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 | 697.5 µg/L 17% of the EPA limit 4000 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 885.5 µg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 3/3 | SYR4 |
| Nitrate | 730 µg/L 7.3% of the EPA limit 10000 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 1/3 | SYR4 |
| Nitrate-Nitrite | 730 µg/L 7.3% of the EPA limit 10000 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2017
Highest in the ZIP: 247.5 µg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/3 | SYR4 |
| TTHM | 59.25 µg/L 74% of the EPA limit 80 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 98.195 µg/L — HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 3/3 | SYR4 |
| Lithium | 51.3 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2025
Highest in the ZIP: 62.5 µg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2025 | 3/3 | UCMR-5 |
| Copper | 42.6548 µg/L 3.3% of the EPA limit 1300 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/3 | SYR4 |
| Dibromochloromethane | 17 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 36.2905 µg/L — HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27.4 µg/L 46% of the EPA limit 60 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 3/3 | SYR4 |
| Bromoform | 9.76 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 26.0195 µg/L — HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 21.2715 µg/L — HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 3/3 | SYR4 |
| Chloroform | 20 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 5.215 µg/L 17% of the EPA limit 30 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 17.135 µg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/3 | SYR4 |
| Dichloroacetic Acid | 11 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 14 µg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 5.71 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 10 µg/L — HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 3/3 | SYR4 |
| Gross Beta Particle Activity | 10 pCi/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Selenium | 9.125 µg/L 18% of the EPA limit 50 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/3 | SYR4 |
| Trichloroacetic Acid | 8.87 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 5.64 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 3/3 | SYR4 |
| Arsenic | 2.94 µg/L 29% of the EPA limit 10 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2017
Highest in the ZIP: 3.09045 µg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 2/3 | SYR4 |
| Monobromoacetic Acid | 2.1 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 3/3 | SYR4 |
| Chromium | 1.14 µg/L 1.1% of the EPA limit 100 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Lead | 0.7370 µg/L 4.9% of the EPA limit 15 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Antimony, Total | 0.0360 µg/L 0.6% of the EPA limit 6 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Cadmium | 0.0070 µg/L 0.1% of the EPA limit 5 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Beryllium, Total | 0.0020 µg/L 0.1% of the EPA limit 4 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2018 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2022
Highest in the ZIP: 0.0014 mg/L — CALIFORNIA WATER SERVICE CO. - HERM/REDO · 96,853 people · 2023 | 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 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 90278
| Supplier | State | Population served |
|---|---|---|
| GSWC - SOUTHWEST | CA | 277,740 |
| CALIFORNIA WATER SERVICE CO. - HERM/REDO | CA | 96,853 |
| HAWTHORNE-CITY WATER DEPT. | CA | 44,718 |
Frequently asked questions about ZIP 90278 tap water
Is the tap water in ZIP 90278 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 90278. 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 90278?
3 public water suppliers report EPA drinking-water monitoring for ZIP 90278. Each is listed above with its population served.
What contaminants are in ZIP 90278's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.