What was found in ZIP 90640
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 | 3/6 | 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 | 5/6 | 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: 933 µg/L — SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2018 | 5/6 | 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 | 3/6 | 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 | 3/6 | SYR4 |
| Copper | 68.371 µg/L 5.3% of the EPA limit 1300 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | 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 | 2/6 | SYR4 |
| 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: 57.12 µg/L — SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 6/6 | SYR4 |
| Lithium | 54 µg/L No EPA limit set Highest in the ZIP: SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2023 | 3/6 | UCMR-5 |
| 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: 26.3 µg/L — SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 5/6 | 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: 22.3 µg/L — SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 4/6 | 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: 18.15 µg/L — CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 6/6 | 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: 17.078 µg/L — CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 6/6 | 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: 16 µg/L — MONTEBELLO LAND & WATER CO. · 26,554 people · 2019 | 6/6 | 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 | 3/6 | SYR4 |
| Dichloroacetic Acid | 13 µg/L No EPA limit set Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 2/6 | 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 | 2/6 | SYR4 |
| Chromium | 11.6063 µg/L 12% of the EPA limit 100 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | 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: 8.24 µg/L — CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 4/6 | SYR4 |
| Trichloroacetic Acid | 8.115 µg/L No EPA limit set Highest in the ZIP: SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 2/6 | 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 | 1/6 | 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: 7.22 µg/L — SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 5/6 | SYR4 |
| Monobromoacetic Acid | 6.8 µg/L No EPA limit set Highest in the ZIP: SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 2/6 | SYR4 |
| Lead | 6.6152 µg/L 44% of the EPA limit 15 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | 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 | 1/6 | 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 | 1/6 | 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: 5.2 µg/L — SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 · 7,330 people · 2019 | 3/6 | 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 | 2/6 | 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 | 1/6 | 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 | 1/6 | SYR4 |
| Xylenes, Total | 3 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | SYR4 |
| Combined Radium (-226 And -228) | 2.47 pCi/L 49% of the EPA limit 5 pCi/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2018 | 1/6 | 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 | 1/6 | 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 | 1/6 | 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 | 1/6 | SYR4 |
| Ethylbenzene | 0.5000 µg/L 0.1% of the EPA limit 700 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | 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 | 1/6 | SYR4 |
| Antimony, Total | 0.0790 µg/L 1.3% of the EPA limit 6 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | SYR4 |
| PFOS | 0.0530 µg/L No EPA limit set Highest in the ZIP: MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 3/6 | UCMR-5 |
| PFOA | 0.0160 µg/L No EPA limit set Highest in the ZIP: MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 2/6 | UCMR-5 |
| Cadmium | 0.0141 µg/L 0.3% of the EPA limit 5 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | SYR4 |
| 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 — MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 3/6 | 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: 0.0129 µg/L — CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2025 | 4/6 | UCMR-5 |
| PFBS | 0.0110 µg/L No EPA limit set Highest in the ZIP: MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 3/6 | UCMR-5 |
| Pfhxa | 0.0091 µg/L No EPA limit set Highest in the ZIP: MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 3/6 | UCMR-5 |
| PFHXS | 0.0086 µg/L No EPA limit set Highest in the ZIP: MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 1/6 | UCMR-5 |
| Pfhpa | 0.0049 µg/L No EPA limit set Highest in the ZIP: MONTEBELLO LAND & WATER CO. · 26,554 people · 2024 | 1/6 | UCMR-5 |
| Beryllium, Total | 0.0048 µg/L 0.1% of the EPA limit 4 µg/L Highest in the ZIP: CALIFORNIA WATER SERVICE CO. - ELA · 152,474 people · 2019 | 1/6 | SYR4 |
| Pfda | 0.0037 µg/L No EPA limit set Highest in the ZIP: SOUTH MONTEBELLO IRRIGATION DIST. · 15,021 people · 2024 | 1/6 | 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 | 6/6 | 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 90640
| Supplier | State | Population served |
|---|---|---|
| SAN GABRIEL VALLEY WATER CO.-EL MONTE | CA | 248,000 |
| CALIFORNIA WATER SERVICE CO. - ELA | CA | 152,474 |
| MONTEBELLO LAND & WATER CO. | CA | 26,554 |
| SOUTH MONTEBELLO IRRIGATION DIST. | CA | 15,021 |
| SAN GABRIEL VALLEY WATER CO-MONTEBELLO 1 | CA | 9,630 |
| SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2 | CA | 7,330 |
Frequently asked questions about ZIP 90640 tap water
Is the tap water in ZIP 90640 safe to drink?
EPA testing detected 50 contaminants across the water suppliers serving ZIP 90640. 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 90640?
6 public water suppliers report EPA drinking-water monitoring for ZIP 90640. Each is listed above with its population served.
What contaminants are in ZIP 90640'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.