What was found in La Puente'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 | 8200 µg/L 82% of the EPA limit 10000 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 8125 µg/L 81% of the EPA limit 10000 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Nitrite | 7850 µg/L 785% of the EPA limit, at the 95th percentile of samples — 1000 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Fluoride | 529.5 µg/L 13% of the EPA limit 4000 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019
Highest in the city: 539 µg/L — CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2018 | 2/2 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019
Highest in the city: 188.5 µg/L — CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2018 | 2/2 | SYR4 |
| Trichloroethylene | 79.3 µg/L 1586% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| TTHM | 41.9 µg/L 52% of the EPA limit 80 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 19.3 µg/L 32% of the EPA limit 60 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Chloroform | 18.25 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 13.6 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 4.24 µg/L 85% of the EPA limit 5 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019
Highest in the city: 12 µg/L — CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 11.815 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 11.3 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 10.865 µg/L 181% of the EPA limit, at the 95th percentile of samples — 6 µg/L Highest in the city: CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 6.33 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 3.3227 µg/L 11% of the EPA limit 30 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019
Highest in the city: 5.96 µg/L — CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2015 | 2/2 | SYR4 |
| Bromoform | 5.105 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| Carbon Tetrachloride | 4 µg/L 80% of the EPA limit 5 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 3.1 pCi/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 3.04 µg/L No EPA limit set Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 2/2 | SYR4 |
| 1,2-Dichloroethane | 2.91 µg/L 58% of the EPA limit 5 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 0.7400 µg/L 15% of the EPA limit 5 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019
Highest in the city: 2.4 µg/L — CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2019 | 2/2 | SYR4 |
| 1,1-Dichloroethylene | 2.3 µg/L 33% of the EPA limit 7 µg/L Highest in the city: CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2019 | 1/2 | SYR4 |
| Arsenic | 2.3 µg/L 23% of the EPA limit 10 µg/L Highest in the city: CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2018 | 1/2 | SYR4 |
| cis-1,2-Dichloroethylene | 1.73 µg/L 2.5% of the EPA limit 70 µg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2019 | 1/2 | SYR4 |
| Pentachlorophenol | 0.8100 µg/L 81% of the EPA limit 1 µg/L Highest in the city: CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2019 | 1/2 | SYR4 |
| trans-1,2-Dichloroethylene | 0.8000 µg/L 0.8% of the EPA limit 100 µg/L Highest in the city: CITY OF INDUSTRY WATERWORKS SYSTEMS · 6,158 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LA PUENTE VALLEY CWD · 8,243 people · 2028 | 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 La Puente
| Supplier | Population served |
|---|---|
| LA PUENTE VALLEY CWD | 8,243 |
| CITY OF INDUSTRY WATERWORKS SYSTEMS | 6,158 |
Frequently asked questions about La Puente tap water
Is La Puente tap water safe to drink?
EPA testing detected 28 contaminants in the water serving La Puente. 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 La Puente?
2 public water suppliers report drinking-water monitoring for La Puente, California to the EPA. Each is listed above with its population served.
What contaminants are in La Puente's water?
The contaminants EPA monitoring detected in La Puente include Nitrate, Nitrate-Nitrite, Nitrite, Fluoride, Barium. 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.