What was found in ZIP 90255
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 | 385000 µg/L 3850% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018
Highest in the ZIP: 994500 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2017 | 4/5 | SYR4 |
| Nitrate | 7235 µg/L 72% of the EPA limit 10000 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 12000 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Fluoride | 526 µg/L 13% of the EPA limit 4000 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 540 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2018 | 5/5 | SYR4 |
| Barium | 130 µg/L 6.5% of the EPA limit 2000 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018
Highest in the ZIP: 186.5 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2018 | 4/5 | SYR4 |
| Copper | 76 µg/L 5.8% of the EPA limit 1300 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018 | 2/5 | SYR4 |
| TTHM | 48 µg/L 60% of the EPA limit 80 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 60.655 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Lithium | 45 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2024
Highest in the ZIP: 54 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2024 | 4/5 | UCMR-5 |
| Trichloroethylene | 39 µg/L 780% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019 | 3/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 23.35 µg/L 39% of the EPA limit 60 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019 | 5/5 | SYR4 |
| Dibromochloromethane | 16.35 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 21.21 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Chloroform | 17.4 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 19.72 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 15.65 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 16.5 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Combined Uranium | 11.6518 µg/L 39% of the EPA limit 30 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018
Highest in the ZIP: 14.1624 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Bromoform | 8.9 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 13.055 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2019 | 5/5 | SYR4 |
| Dichloroacetic Acid | 9.04 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 12.1 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2019 | 4/5 | SYR4 |
| Tetrachloroethylene | 8.32 µg/L 166% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 8.7 µg/L — GSWC - BELL, BELL GARDENS · 55,050 people · 2019 | 3/5 | SYR4 |
| Lead | 8.23 µg/L 55% of the EPA limit 15 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018 | 1/5 | SYR4 |
| Selenium | 7.56 µg/L 15% of the EPA limit 50 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018 | 3/5 | SYR4 |
| Monochloroacetic Acid | 4.96 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 7.34 µg/L — GSWC - BELL, BELL GARDENS · 55,050 people · 2019 | 3/5 | SYR4 |
| Trichloroacetic Acid | 7.24 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019 | 4/5 | SYR4 |
| Dibromoacetic Acid | 4.715 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 6.6 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 5/5 | SYR4 |
| Monobromoacetic Acid | 3.72 µg/L No EPA limit set Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 4.47 µg/L — GSWC - BELL, BELL GARDENS · 55,050 people · 2019 | 3/5 | SYR4 |
| cis-1,2-Dichloroethylene | 4.39 µg/L 6.3% of the EPA limit 70 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019 | 1/5 | SYR4 |
| Carbon Tetrachloride | 2.77 µg/L 55% of the EPA limit 5 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019
Highest in the ZIP: 3.15 µg/L — HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 2/5 | SYR4 |
| Arsenic | 2.89 µg/L 29% of the EPA limit 10 µg/L Highest in the ZIP: HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2019 | 2/5 | SYR4 |
| Chromium | 2.5 µg/L 2.5% of the EPA limit 100 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2018 | 1/5 | SYR4 |
| 1,2-Dichloroethane | 2.1 µg/L 42% of the EPA limit 5 µg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2019 | 1/5 | SYR4 |
| 1,1-Dichloroethylene | 1.4 µg/L 20% of the EPA limit 7 µg/L Highest in the ZIP: GSWC - BELL, BELL GARDENS · 55,050 people · 2019 | 1/5 | SYR4 |
| PFOS | 0.0230 µg/L No EPA limit set Highest in the ZIP: HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2024 | 3/5 | UCMR-5 |
| Pfba | 0.0110 µg/L No EPA limit set Highest in the ZIP: GSWC - BELL, BELL GARDENS · 55,050 people · 2025 | 1/5 | UCMR-5 |
| Pfpea | 0.0073 µg/L No EPA limit set Highest in the ZIP: GSWC - BELL, BELL GARDENS · 55,050 people · 2025 | 1/5 | UCMR-5 |
| Pfhxa | 0.0066 µg/L No EPA limit set Highest in the ZIP: GSWC - BELL, BELL GARDENS · 55,050 people · 2025 | 1/5 | UCMR-5 |
| PFHXS | 0.0051 µg/L No EPA limit set Highest in the ZIP: HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2024 | 2/5 | UCMR-5 |
| PFOA | 0.0051 µg/L No EPA limit set Highest in the ZIP: HUNTINGTON PARK-CITY, WATER DEPT. · 15,437 people · 2024 | 1/5 | UCMR-5 |
| PFBS | 0.0041 µg/L No EPA limit set Highest in the ZIP: GSWC - BELL, BELL GARDENS · 55,050 people · 2025 | 1/5 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GSWC - FLORENCE/GRAHAM · 63,472 people · 2025 | 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 90255
| Supplier | State | Population served |
|---|---|---|
| GSWC - FLORENCE/GRAHAM | CA | 63,472 |
| GSWC - BELL, BELL GARDENS | CA | 55,050 |
| WALNUT PARK MUTUAL WATER CO. | CA | 16,180 |
| HUNTINGTON PARK-CITY, WATER DEPT. | CA | 15,437 |
| MAYWOOD MUTUAL WATER CO. #1 | CA | 5,500 |
Frequently asked questions about ZIP 90255 tap water
Is the tap water in ZIP 90255 safe to drink?
EPA testing detected 36 contaminants across the water suppliers serving ZIP 90255. 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 90255?
5 public water suppliers report EPA drinking-water monitoring for ZIP 90255. Each is listed above with its population served.
What contaminants are in ZIP 90255's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.