What was found in Maywood's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| 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 city: 3616 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | 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 | 2/2 | 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 city: 119 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | 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 city: 87.98 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | SYR4 |
| Lead | 41.55 µg/L 277% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 19.14 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the city: 35.595 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | SYR4 |
| Bromoform | 14.785 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the city: 31.03 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | SYR4 |
| Lithium | 14.8 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2025
Highest in the city: 21.8 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 2/2 | 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 city: 15.62 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 11.71 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019
Highest in the city: 14.865 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | 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 city: 10.6 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | SYR4 |
| Chloroform | 9.785 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 5.455 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 4.855 µg/L 97% of the EPA limit 5 µg/L Highest in the city: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.06 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 2.88315 µg/L 9.6% of the EPA limit 30 µg/L Highest in the city: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 1/2 | 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 city: 2.405 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2019 | 2/2 | 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 | 1/2 | SYR4 |
| PFOS | 0.0043 µg/L No EPA limit set Main supplier: MAYWOOD MUTUAL WATER CO. #2 · 6,349 people · 2025
Highest in the city: 0.0264 µg/L — MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 2/2 | UCMR-5 |
| PFOA | 0.0073 µg/L No EPA limit set Highest in the city: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0061 µg/L No EPA limit set Highest in the city: MAYWOOD MUTUAL WATER CO. #3 · 6,059 people · 2025 | 1/2 | 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 | 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.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Maywood
| Supplier | Population served |
|---|---|
| MAYWOOD MUTUAL WATER CO. #2 | 6,349 |
| MAYWOOD MUTUAL WATER CO. #3 | 6,059 |
Frequently asked questions about Maywood tap water
Is Maywood tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Maywood. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Maywood?
2 public water suppliers report drinking-water monitoring for Maywood, California to the EPA. Each is listed above with its population served.
What contaminants are in Maywood's water?
The contaminants EPA monitoring detected in Maywood include Nitrate, Fluoride, Barium, TTHM, Lead. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.