What was found in ZIP 90220
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 | 896500 µg/L 8965% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Highest in the ZIP: SUBURBAN WATER SYSTEMS - SATIVA · 4,363 people · 2013 | 1/5 | SYR4 |
| Copper | 4427 µg/L 341% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 2/5 | SYR4 |
| Nitrate | 1303.78 µg/L 13% of the EPA limit 10000 µg/L Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 3/5 | SYR4 |
| 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: 879.2 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 5/5 | 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: 172 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 4/5 | 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: 77.28 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 5/5 | SYR4 |
| Lithium | 51.3 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2025
Highest in the ZIP: 67.7 µg/L — LIBERTY UTILITIES - COMPTON · 26,371 people · 2023 | 4/5 | UCMR-5 |
| Chloroform | 20 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 41.354 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 4/5 | SYR4 |
| Selenium | 39.4 µg/L 79% of the EPA limit 50 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/5 | 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
Highest in the ZIP: 29 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 4/5 | SYR4 |
| Dibromochloromethane | 17 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 21.76 µg/L — COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 18 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 19.73 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 5/5 | SYR4 |
| Lead | 17 µg/L 113% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 2/5 | SYR4 |
| Bromoform | 9.76 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 16.68 µg/L — COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 5/5 | SYR4 |
| Monochloroacetic Acid | 5.64 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 15.185 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/5 | SYR4 |
| Dichloroacetic Acid | 11 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 15 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 4/5 | SYR4 |
| Trichloroacetic Acid | 8.87 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 12 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 4/5 | 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: 8.1056 µg/L — SUBURBAN WATER SYSTEMS - SATIVA · 4,363 people · 2015 | 3/5 | SYR4 |
| Dibromoacetic Acid | 5.71 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019
Highest in the ZIP: 7.8 µg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 4/5 | 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: 4.92 µg/L — COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 4/5 | SYR4 |
| Tetrachloroethylene | 3.98 µg/L 80% of the EPA limit 5 µg/L Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 2/5 | SYR4 |
| Trichloroethylene | 3.8145 µg/L 76% of the EPA limit 5 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 3/5 | SYR4 |
| Dichloromethane | 3.455 µg/L 69% of the EPA limit 5 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 2/5 | SYR4 |
| cis-1,2-Dichloroethylene | 2.3 µg/L 3.3% of the EPA limit 70 µg/L Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2019 | 1/5 | SYR4 |
| Monobromoacetic Acid | 2.1 µg/L No EPA limit set Main supplier: GSWC - SOUTHWEST · 277,740 people · 2019 | 2/5 | SYR4 |
| Chromium | 1.663 µg/L 1.7% of the EPA limit 100 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/5 | SYR4 |
| Antimony, Total | 0.0590 µg/L 1% of the EPA limit 6 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/5 | SYR4 |
| PFOS | 0.0170 µg/L No EPA limit set Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024 | 1/5 | UCMR-5 |
| Cadmium | 0.0140 µg/L 0.3% of the EPA limit 5 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/5 | SYR4 |
| PFOA | 0.0049 µg/L No EPA limit set Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024 | 1/5 | UCMR-5 |
| PFHXS | 0.0041 µg/L No EPA limit set Highest in the ZIP: COMPTON-CITY, WATER DEPT. · 74,877 people · 2024 | 2/5 | UCMR-5 |
| Beryllium, Total | 0.0030 µg/L 0.1% of the EPA limit 4 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2019 | 1/5 | 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: 0.0018 mg/L — CALIFORNIA WATER SERVICE CO. - DOMINGUEZ · 143,996 people · 2023 | 5/5 | 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 90220
| Supplier | State | Population served |
|---|---|---|
| GSWC - SOUTHWEST | CA | 277,740 |
| CALIFORNIA WATER SERVICE CO. - DOMINGUEZ | CA | 143,996 |
| COMPTON-CITY, WATER DEPT. | CA | 74,877 |
| LIBERTY UTILITIES - COMPTON | CA | 26,371 |
| SUBURBAN WATER SYSTEMS - SATIVA | CA | 4,363 |
Frequently asked questions about ZIP 90220 tap water
Is the tap water in ZIP 90220 safe to drink?
EPA testing detected 33 contaminants across the water suppliers serving ZIP 90220. 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 90220?
5 public water suppliers report EPA drinking-water monitoring for ZIP 90220. Each is listed above with its population served.
What contaminants are in ZIP 90220's water?
EPA monitoring detected Nitrate-Nitrite, Copper, Nitrate, Fluoride, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.