What was found in ZIP 90504
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 | 879.2 µg/L 22% of the EPA limit 4000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Nitrate | 435 µg/L 4.4% of the EPA limit 10000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Barium | 172 µg/L 8.6% of the EPA limit 2000 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| TTHM | 77.28 µg/L 97% of the EPA limit 80 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Lithium | 64.7 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2025 | 2/2 | UCMR-5 |
| Bromoform | 8.73 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019
Highest in the ZIP: 42.08 µg/L — TORRANCE-CITY, WATER DEPT. · 106,183 people · 2019 | 2/2 | SYR4 |
| Chloroform | 41.354 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Selenium | 39.4 µg/L 79% of the EPA limit 50 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29 µg/L 48% of the EPA limit 60 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 19.96 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 19.73 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 15.185 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Copper | 15.114 µg/L 1.2% of the EPA limit 1300 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 15 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 12 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 7.8 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019
Highest in the ZIP: 8.49 µg/L — TORRANCE-CITY, WATER DEPT. · 106,183 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 3.8145 µg/L 76% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Arsenic | 3.604 µg/L 36% of the EPA limit 10 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 3.455 µg/L 69% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.83 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019
Highest in the ZIP: 2.115 µg/L — TORRANCE-CITY, WATER DEPT. · 106,183 people · 2019 | 2/2 | SYR4 |
| Chromium | 1.663 µg/L 1.7% of the EPA limit 100 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Antimony, Total | 0.0590 µg/L 1% of the EPA limit 6 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0260 µg/L 0.2% of the EPA limit 15 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Cadmium | 0.0140 µg/L 0.3% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| PFHXS | 0.0035 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2025 | 1/2 | UCMR-5 |
| Beryllium, Total | 0.0030 µg/L 0.1% of the EPA limit 4 µg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 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 90504
| Supplier | State | Population served |
|---|---|---|
| CALIFORNIA WATER SERVICE CO. - DOMINGUEZ | CA | 143,996 |
| TORRANCE-CITY, WATER DEPT. | CA | 106,183 |
Frequently asked questions about ZIP 90504 tap water
Is the tap water in ZIP 90504 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 90504. 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 90504?
2 public water suppliers report EPA drinking-water monitoring for ZIP 90504. Each is listed above with its population served.
What contaminants are in ZIP 90504's water?
EPA monitoring detected Fluoride, Nitrate, Barium, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.