What was found in ZIP 90703
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 | 702220 µg/L 7022% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2018 | 1/2 | SYR4 |
| Nitrate | 2200 µg/L 22% of the EPA limit 10000 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Fluoride | 540.5 µg/L 14% of the EPA limit 4000 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2018 | 2/2 | SYR4 |
| Barium | 183 µg/L 9.2% of the EPA limit 2000 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2018 | 2/2 | SYR4 |
| Lithium | 61 µg/L No EPA limit set Highest in the ZIP: CERRITOS - CITY, WATER DEPT. · 47,475 people · 2025 | 1/2 | UCMR-5 |
| TTHM | 26 µg/L 33% of the EPA limit 80 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Arsenic | 20 µg/L 200% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.2 µg/L 19% of the EPA limit 60 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 6.94 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019
Highest in the ZIP: 8.5 µg/L — CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 8.1 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Bromoform | 1.735 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019
Highest in the ZIP: 7.93 µg/L — CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019 | 2/2 | SYR4 |
| Copper | 6.205 µg/L 0.5% of the EPA limit 1300 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2018 | 1/2 | SYR4 |
| Monobromoacetic Acid | 6.18 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 5.55 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 4.125 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019
Highest in the ZIP: 5.375 µg/L — CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 4.07515 µg/L 14% of the EPA limit 30 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 3.9 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 0.6100 µg/L 12% of the EPA limit 5 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019
Highest in the ZIP: 2.7 µg/L — CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.74 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2019
Highest in the ZIP: 2.652 µg/L — CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019 | 2/2 | SYR4 |
| Selenium | 2.2 µg/L 4.4% of the EPA limit 50 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2018 | 1/2 | SYR4 |
| 1,1-Dichloroethylene | 0.8830 µg/L 13% of the EPA limit 7 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019
Highest in the ZIP: 1.695 µg/L — CERRITOS - CITY, WATER DEPT. · 47,475 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 0.7930 µg/L 16% of the EPA limit 5 µg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2019 | 2/2 | SYR4 |
| PFOS | 0.0130 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2024 | 2/2 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set Main supplier: GSWC - ARTESIA · 50,415 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GSWC - ARTESIA · 50,415 people · 2025 | 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 90703
| Supplier | State | Population served |
|---|---|---|
| GSWC - ARTESIA | CA | 50,415 |
| CERRITOS - CITY, WATER DEPT. | CA | 47,475 |
Frequently asked questions about ZIP 90703 tap water
Is the tap water in ZIP 90703 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 90703. 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 90703?
2 public water suppliers report EPA drinking-water monitoring for ZIP 90703. Each is listed above with its population served.
What contaminants are in ZIP 90703's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.