What was found in ZIP 90670
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 | 235060 µg/L 2351% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 989500 µg/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 3/5 | SYR4 |
| Nitrate | 11752 µg/L 118% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 3/5 | SYR4 |
| Fluoride | 697 µg/L 17% of the EPA limit 4000 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 3960 µg/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 4/5 | SYR4 |
| Barium | 207 µg/L 10% of the EPA limit 2000 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 281 µg/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 3/5 | SYR4 |
| Tetrachloroethylene | 110 µg/L 2200% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 3/5 | SYR4 |
| Lithium | 88.6 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 4/5 | UCMR-5 |
| TTHM | 10 µg/L 13% of the EPA limit 80 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 67.85 µg/L — SUBURBAN WATER SYSTEMS-LA MIRADA · 56,793 people · 2019 | 5/5 | SYR4 |
| Trichloroethylene | 61 µg/L 1220% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 3/5 | SYR4 |
| Copper | 59 µg/L 4.5% of the EPA limit 1300 µg/L Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 2/5 | SYR4 |
| Chloroform | 1.8 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 26 µg/L — SUBURBAN WATER SYSTEMS-LA MIRADA · 56,793 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.91 µg/L 3.2% of the EPA limit 60 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 24.9 µg/L — GSWC - NORWALK · 43,167 people · 2019 | 5/5 | SYR4 |
| Dibromochloromethane | 4.43 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 21.905 µg/L — SANTA FE SPRINGS - CITY, WATER DEPT. · 19,219 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 2.4 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 20 µg/L — SUBURBAN WATER SYSTEMS-LA MIRADA · 56,793 people · 2019 | 5/5 | SYR4 |
| Combined Uranium | 13.7378 µg/L 46% of the EPA limit 30 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 14.4828 µg/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 4/5 | SYR4 |
| 1,1-Dichloroethylene | 12 µg/L 171% of the EPA limit, at the 95th percentile of samples — 7 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 14 µg/L — GSWC - NORWALK · 43,167 people · 2019 | 3/5 | SYR4 |
| Bromoform | 4.6 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 14 µg/L — GSWC - NORWALK · 43,167 people · 2019 | 5/5 | SYR4 |
| Selenium | 5 µg/L 10% of the EPA limit 50 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 12 µg/L — GSWC - NORWALK · 43,167 people · 2018 | 2/5 | SYR4 |
| Dichloroacetic Acid | 11.4 µg/L No EPA limit set Highest in the ZIP: SANTA FE SPRINGS - CITY, WATER DEPT. · 19,219 people · 2019 | 4/5 | SYR4 |
| Trichloroacetic Acid | 8.1 µg/L No EPA limit set Highest in the ZIP: SUBURBAN WATER SYSTEMS-LA MIRADA · 56,793 people · 2019 | 4/5 | SYR4 |
| Gross Beta Particle Activity | 5.645 pCi/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2018
Highest in the ZIP: 7.9 pCi/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2017 | 2/5 | SYR4 |
| Carbon Tetrachloride | 7.83 µg/L 157% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 1/5 | SYR4 |
| cis-1,2-Dichloroethylene | 3.8 µg/L 5.4% of the EPA limit 70 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 6.4 µg/L — GSWC - NORWALK · 43,167 people · 2019 | 2/5 | SYR4 |
| Chromium | 6.27 µg/L 6.3% of the EPA limit 100 µg/L Highest in the ZIP: GSWC - NORWALK · 43,167 people · 2018 | 1/5 | SYR4 |
| Dibromoacetic Acid | 1.91 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 6.12 µg/L — SANTA FE SPRINGS - CITY, WATER DEPT. · 19,219 people · 2019 | 5/5 | SYR4 |
| trans-1,2-Dichloroethylene | 5.325 µg/L 5.3% of the EPA limit 100 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 2/5 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 5.15 µg/L — GSWC - NORWALK · 43,167 people · 2019 | 3/5 | SYR4 |
| Arsenic | 3.005 µg/L 30% of the EPA limit 10 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019
Highest in the ZIP: 4.74 µg/L — SUBURBAN WATER SYSTEMS-LA MIRADA · 56,793 people · 2018 | 4/5 | SYR4 |
| 1,1,2-Trichloroethane | 3.775 µg/L 76% of the EPA limit 5 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 1/5 | SYR4 |
| Monobromoacetic Acid | 2.5 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 3/5 | SYR4 |
| 1,2-Dichloroethane | 2.3 µg/L 46% of the EPA limit 5 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 2/5 | SYR4 |
| Dichloromethane | 1.1 µg/L 22% of the EPA limit 5 µg/L Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2019 | 1/5 | SYR4 |
| Pentachlorophenol | 0.8470 µg/L 85% of the EPA limit 1 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 1/5 | SYR4 |
| 1,2-Dichloropropane | 0.8040 µg/L 16% of the EPA limit 5 µg/L Highest in the ZIP: GSWC - NORWALK · 43,167 people · 2019 | 1/5 | SYR4 |
| Toluene | 0.5200 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 1/5 | SYR4 |
| Nitrite | 0.4700 µg/L 0% of the EPA limit 1000 µg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2019 | 1/5 | SYR4 |
| Mercury | 0.2100 µg/L 11% of the EPA limit 2 µg/L Highest in the ZIP: GSWC - NORWALK · 43,167 people · 2018 | 1/5 | SYR4 |
| PFOS | 0.0590 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 3/5 | UCMR-5 |
| Pfpea | 0.0056 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2025
Highest in the ZIP: 0.0170 µg/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 5/5 | UCMR-5 |
| PFOA | 0.0160 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 3/5 | UCMR-5 |
| Pfba | 0.0100 µg/L No EPA limit set Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2025
Highest in the ZIP: 0.0140 µg/L — SANTA FE SPRINGS - CITY, WATER DEPT. · 19,219 people · 2024 | 5/5 | UCMR-5 |
| Pfhxa | 0.0130 µg/L No EPA limit set Highest in the ZIP: GSWC - NORWALK · 43,167 people · 2025 | 2/5 | UCMR-5 |
| PFHXS | 0.0110 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 2/5 | UCMR-5 |
| PFBS | 0.0089 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 3/5 | UCMR-5 |
| Pfhpa | 0.0039 µg/L No EPA limit set Highest in the ZIP: LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 people · 2024 | 1/5 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SAN GABRIEL VALLEY WATER CO.-EL MONTE · 248,000 people · 2023
Highest in the ZIP: 0.0019 mg/L — LIBERTY UTILITIES - BELLFLOWER-NORWALK · 72,624 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 90670
| Supplier | State | Population served |
|---|---|---|
| SAN GABRIEL VALLEY WATER CO.-EL MONTE | CA | 248,000 |
| LIBERTY UTILITIES - BELLFLOWER-NORWALK | CA | 72,624 |
| SUBURBAN WATER SYSTEMS-LA MIRADA | CA | 56,793 |
| GSWC - NORWALK | CA | 43,167 |
| SANTA FE SPRINGS - CITY, WATER DEPT. | CA | 19,219 |
Frequently asked questions about ZIP 90670 tap water
Is the tap water in ZIP 90670 safe to drink?
EPA testing detected 45 contaminants across the water suppliers serving ZIP 90670. 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 90670?
5 public water suppliers report EPA drinking-water monitoring for ZIP 90670. Each is listed above with its population served.
What contaminants are in ZIP 90670's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, Tetrachloroethylene, and others across this ZIP's suppliers. The full list with levels and sources is above.