What was found in ZIP 90270
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 | 994500 µg/L 9945% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Highest in the ZIP: MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2017 | 1/3 | SYR4 |
| Nitrate | 881.4 µg/L 8.8% of the EPA limit 10000 µg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 3616 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 3/3 | SYR4 |
| Fluoride | 365 µg/L 9.1% of the EPA limit 4000 µg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 540 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2018 | 3/3 | SYR4 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 186.5 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2018 | 3/3 | SYR4 |
| TTHM | 49.765 µg/L 62% of the EPA limit 80 µg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 87.98 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 3/3 | SYR4 |
| Lead | 41.55 µg/L 277% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the ZIP: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 19.14 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 35.595 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 3/3 | SYR4 |
| Bromoform | 14.785 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 31.03 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 3/3 | SYR4 |
| Lithium | 14.8 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2025
Highest in the ZIP: 21.8 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 3/3 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 11.125 µg/L 19% of the EPA limit 60 µg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 21.72 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2019 | 3/3 | SYR4 |
| Chloroform | 9.785 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 18.555 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 11.71 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 14.865 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 5.455 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 12.1 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 6.5 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 10.6 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 2.27 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the ZIP: 6.15 µg/L — MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2019 | 3/3 | SYR4 |
| Trichloroethylene | 4.855 µg/L 97% of the EPA limit 5 µg/L Highest in the ZIP: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 1/3 | SYR4 |
| Combined Uranium | 3.24075 µg/L 11% of the EPA limit 30 µg/L Highest in the ZIP: MAYWOOD MUTUAL WATER CO. #1 · 5,500 people · 2018 | 2/3 | SYR4 |
| Monochloroacetic Acid | 3.06 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019 | 1/3 | SYR4 |
| Dichloromethane | 1.088 µg/L 22% of the EPA limit 5 µg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019 | 1/3 | SYR4 |
| PFOS | 0.0043 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2025
Highest in the ZIP: 0.0264 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 3/3 | UCMR-5 |
| PFOA | 0.0073 µg/L No EPA limit set Highest in the ZIP: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 1/3 | UCMR-5 |
| PFHXS | 0.0061 µg/L No EPA limit set Highest in the ZIP: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 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 90270
| Supplier | State | Population served |
|---|---|---|
| MAYWOOD MUTUAL WATER CO. #2 | CA | 6,349 |
| MAYWOOD MUTUAL WATER CO. #3 | CA | 6,059 |
| MAYWOOD MUTUAL WATER CO. #1 | CA | 5,500 |
Frequently asked questions about ZIP 90270 tap water
Is the tap water in ZIP 90270 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 90270. 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 90270?
3 public water suppliers report EPA drinking-water monitoring for ZIP 90270. Each is listed above with its population served.
What contaminants are in ZIP 90270's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.