What was found in ZIP 90304
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: 841.8 µg/L — HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 2/2 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2017 | 1/2 | 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 | 2/2 | SYR4 |
| Lithium | 51.3 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2025 | 2/2 | UCMR-5 |
| 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 | 2/2 | 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 | 2/2 | 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 | 2/2 | 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 | 2/2 | SYR4 |
| Copper | 20.56 µg/L 1.6% of the EPA limit 1300 µg/L Highest in the ZIP: HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 1/2 | SYR4 |
| Chloroform | 20 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 11 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 2/2 | 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 | 2/2 | SYR4 |
| Trichloroacetic Acid | 8.87 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 5.64 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 2/2 | SYR4 |
| Selenium | 5.3 µg/L 11% of the EPA limit 50 µg/L Highest in the ZIP: HAWTHORNE-CITY WATER DEPT. · 44,718 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 5.215 µg/L 17% of the EPA limit 30 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 1/2 | SYR4 |
| Arsenic | 2.94 µg/L 29% of the EPA limit 10 µg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2017 | 1/2 | SYR4 |
| Monobromoacetic Acid | 2.1 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 2/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GSWC - SOUTHWEST · 277,740 people · 2022 | 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 90304
| Supplier | State | Population served |
|---|---|---|
| GSWC - SOUTHWEST | CA | 277,740 |
| HAWTHORNE-CITY WATER DEPT. | CA | 44,718 |
Frequently asked questions about ZIP 90304 tap water
Is the tap water in ZIP 90304 safe to drink?
EPA testing detected 19 contaminants across the water suppliers serving ZIP 90304. 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 90304?
2 public water suppliers report EPA drinking-water monitoring for ZIP 90304. Each is listed above with its population served.
What contaminants are in ZIP 90304's water?
EPA monitoring detected Fluoride, Barium, TTHM, Lithium, Dibromochloromethane, and others across this ZIP's suppliers. The full list with levels and sources is above.