What was found in Alhambra'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 | 4102.5 µg/L 41% of the EPA limit 10000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 12232.3 µg/L — LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM · 11,509 people · 2019 | 8/10 | SYR4 |
| Nitrate-Nitrite | 4540 µg/L 45% of the EPA limit 10000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 12200 µg/L — CITY OF ALHAMBRA · 79,776 people · 2019 | 8/10 | SYR4 |
| Fluoride | 685.1 µg/L 17% of the EPA limit 4000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 1430.35 µg/L — LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM · 11,509 people · 2019 | 8/10 | SYR4 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 194.6 µg/L — LOS ANGELES CWWD 37-ACTON · 4,805 people · 2019 | 4/10 | SYR4 |
| TTHM | 80.3 µg/L 100% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 101.305 µg/L — LOS ANGELES CWWD 40, REG. 35-N.E. L.A. · 612 people · 2017 | 10/10 | SYR4 |
| Lithium | 17.1 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2024
Highest in the city: 58 µg/L — CITY OF ALHAMBRA · 79,776 people · 2024 | 3/10 | UCMR-5 |
| Dibromochloromethane | 34.925 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 40.65 µg/L — LOS ANGELES CWWD 40, REG. 35-N.E. L.A. · 612 people · 2017 | 10/10 | SYR4 |
| Bromoform | 31.27 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 10/10 | SYR4 |
| Arsenic | 28.77 µg/L 288% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 3/10 | SYR4 |
| Bromodichloromethane | 18.565 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 27.52 µg/L — LOS ANGELES CWWD 40, REG. 35-N.E. L.A. · 612 people · 2017 | 10/10 | SYR4 |
| cis-1,2-Dichloroethylene | 26 µg/L 37% of the EPA limit 70 µg/L Highest in the city: CITY OF ALHAMBRA · 79,776 people · 2019 | 1/10 | SYR4 |
| Trichloroacetic Acid | 4.68 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017
Highest in the city: 25.6 µg/L — LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM · 11,509 people · 2019 | 9/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25 µg/L 42% of the EPA limit 60 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017 | 10/10 | SYR4 |
| Chloroform | 9.15 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 24.3 µg/L — CITY OF ALHAMBRA · 79,776 people · 2019 | 10/10 | SYR4 |
| Trichloroethylene | 22 µg/L 440% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the city: CITY OF ALHAMBRA · 79,776 people · 2019 | 1/10 | SYR4 |
| Dibromoacetic Acid | 17.07 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017 | 10/10 | SYR4 |
| Chromium | 16.1 µg/L 16% of the EPA limit 100 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 5/10 | SYR4 |
| Selenium | 7.02 µg/L 14% of the EPA limit 50 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 12.1 µg/L — LOS ANGELES CWWD 37-ACTON · 4,805 people · 2019 | 2/10 | SYR4 |
| Dichloroacetic Acid | 8.724 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017
Highest in the city: 12 µg/L — CITY OF ALHAMBRA · 79,776 people · 2019 | 9/10 | SYR4 |
| Combined Uranium | 7.6735 µg/L 26% of the EPA limit 30 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019
Highest in the city: 10.9664 µg/L — CITY OF ALHAMBRA · 79,776 people · 2018 | 6/10 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 10.61 µg/L 177% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/10 | SYR4 |
| Lead | 6.17 µg/L 41% of the EPA limit 15 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/10 | SYR4 |
| Gross Beta Particle Activity | 4.14 pCi/L No EPA limit set Highest in the city: LOS ANGELES CWWD 40, REG. 38-LAKE LA · 12,568 people · 2016 | 1/10 | SYR4 |
| Monobromoacetic Acid | 2.689 µg/L No EPA limit set Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2017
Highest in the city: 3.7505 µg/L — LOS ANGELES CWWD 29 & 80-MALIBU · 32,348 people · 2019 | 7/10 | SYR4 |
| Tetrachloroethylene | 3.135 µg/L 63% of the EPA limit 5 µg/L Highest in the city: CITY OF ALHAMBRA · 79,776 people · 2019 | 1/10 | SYR4 |
| Combined Radium (-226 And -228) | 2.9 pCi/L 58% of the EPA limit 5 pCi/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/10 | SYR4 |
| trans-1,2-Dichloroethylene | 0.7800 µg/L 0.8% of the EPA limit 100 µg/L Highest in the city: CITY OF ALHAMBRA · 79,776 people · 2019 | 1/10 | SYR4 |
| 1,1-Dichloroethylene | 0.7160 µg/L 10% of the EPA limit 7 µg/L Highest in the city: CITY OF ALHAMBRA · 79,776 people · 2019 | 1/10 | SYR4 |
| Toluene | 0.5710 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2019 | 1/10 | SYR4 |
| Carbon Tetrachloride | 0.5200 µg/L 10% of the EPA limit 5 µg/L Highest in the city: CITY OF ALHAMBRA · 79,776 people · 2019 | 1/10 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.1300 µg/L 65% of the EPA limit 0.2000 µg/L Highest in the city: LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM · 11,509 people · 2019 | 1/10 | SYR4 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER · 208,129 people · 2025 | 10/10 | 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 Alhambra
| Supplier | Population served |
|---|---|
| LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER | 208,129 |
| CITY OF ALHAMBRA | 79,776 |
| LOS ANGELES CWWD 29 & 80-MALIBU | 32,348 |
| LOS ANGELES CWWD 40, REG. 38-LAKE LA | 12,568 |
| LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM | 11,509 |
| LOS ANGELES CWWD 36-VAL VERDE | 6,376 |
| LOS ANGELES CWWD 37-ACTON | 4,805 |
| LOS ANGELES CWWD 40, REG. 39-ROCK CREEK | 994 |
| LOS ANGELES CWWD 21-KAGEL CANYON | 708 |
| LOS ANGELES CWWD 40, REG. 35-N.E. L.A. | 612 |
Frequently asked questions about Alhambra tap water
Is Alhambra tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Alhambra. 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 Alhambra?
10 public water suppliers report drinking-water monitoring for Alhambra, California to the EPA. Each is listed above with its population served.
What contaminants are in Alhambra's water?
The contaminants EPA monitoring detected in Alhambra include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. 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.