What was found in ZIP 90720
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 | 592500 µg/L 5925% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 702220 µg/L — GSWC - ARTESIA · 50,415 people · 2018 | 2/3 | SYR4 |
| Nitrate | 5491.8 µg/L 55% of the EPA limit 10000 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 2/3 | SYR4 |
| Fluoride | 567 µg/L 14% of the EPA limit 4000 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Barium | 102.75 µg/L 5.1% of the EPA limit 2000 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 183 µg/L — GSWC - ARTESIA · 50,415 people · 2018 | 2/3 | SYR4 |
| Monochloroacetic Acid | 4.48 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 88.44 µg/L — CITY OF SEAL BEACH · 24,937 people · 2019 | 3/3 | SYR4 |
| TTHM | 44.6 µg/L 56% of the EPA limit 80 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Lithium | 34.2938 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025
Highest in the ZIP: 35.4811 µg/L — CITY OF SEAL BEACH · 24,937 people · 2025 | 2/3 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 21.7 µg/L 36% of the EPA limit 60 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 24.015 µg/L — CITY OF SEAL BEACH · 24,937 people · 2019 | 3/3 | SYR4 |
| Arsenic | 4.53 µg/L 45% of the EPA limit 10 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 20 µg/L — GSWC - ARTESIA · 50,415 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 19.7201 µg/L 66% of the EPA limit 30 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Chloroform | 17.1 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 19.72 µg/L — CITY OF SEAL BEACH · 24,937 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 16 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 15 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 9.835 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Bromoform | 7.5 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 7.6465 µg/L — CITY OF SEAL BEACH · 24,937 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 7.065 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 3/3 | SYR4 |
| Copper | 6.205 µg/L 0.5% of the EPA limit 1300 µg/L Highest in the ZIP: GSWC - ARTESIA · 50,415 people · 2018 | 1/3 | SYR4 |
| Monobromoacetic Acid | 2.08 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 6.18 µg/L — GSWC - ARTESIA · 50,415 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 4.635 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019
Highest in the ZIP: 5.02 µg/L — CITY OF SEAL BEACH · 24,937 people · 2019 | 3/3 | SYR4 |
| Selenium | 2.9 µg/L 5.8% of the EPA limit 50 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 2.84 pCi/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 1/3 | SYR4 |
| Chromium | 2.2 µg/L 2.2% of the EPA limit 100 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 1/3 | SYR4 |
| 1,1-Dichloroethylene | 0.8830 µg/L 13% of the EPA limit 7 µg/L Highest in the ZIP: GSWC - ARTESIA · 50,415 people · 2019 | 1/3 | SYR4 |
| Tetrachloroethylene | 0.7930 µg/L 16% of the EPA limit 5 µg/L Highest in the ZIP: GSWC - ARTESIA · 50,415 people · 2019 | 1/3 | SYR4 |
| Trichloroethylene | 0.7000 µg/L 14% of the EPA limit 5 µg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2019 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.5478 pCi/L 11% of the EPA limit 5 pCi/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2013 | 2/3 | SYR4 |
| PFOS | 0.0160 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025 | 2/3 | UCMR-5 |
| PFHXS | 0.0093 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025 | 2/3 | UCMR-5 |
| PFOA | 0.0081 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0036 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025 | 1/3 | UCMR-5 |
| Pfhxa | 0.0034 µg/L No EPA limit set Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0022 mg/L 15% of the EPA limit 0.0150 mg/L Main supplier: GOLDEN STATE WC - WEST ORANGE COUNTY · 114,379 people · 2025 | 3/3 | 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 90720
| Supplier | State | Population served |
|---|---|---|
| GOLDEN STATE WC - WEST ORANGE COUNTY | CA | 114,379 |
| GSWC - ARTESIA | CA | 50,415 |
| CITY OF SEAL BEACH | CA | 24,937 |
Frequently asked questions about ZIP 90720 tap water
Is the tap water in ZIP 90720 safe to drink?
EPA testing detected 32 contaminants across the water suppliers serving ZIP 90720. 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 90720?
3 public water suppliers report EPA drinking-water monitoring for ZIP 90720. Each is listed above with its population served.
What contaminants are in ZIP 90720's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Monochloroacetic Acid, and others across this ZIP's suppliers. The full list with levels and sources is above.