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Tap water quality report

La Puente, CA

EPA monitoring detected 28 contaminants across the 2 water suppliers serving La Puente. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
14,401
people served
28
contaminants found
California rankings Lead in California PFAS in California

What was found in La Puente's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
10000 µg/L 100%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrate-Nitrite
8200 µg/L 82%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrite
8100 µg/L 810%
of the EPA limit, in the worst sample — 1000 µg/L
 1/2 SYR4
Fluoride
580 µg/L 14%
of the EPA limit 4000 µg/L
 2/2 SYR4
Barium
190 µg/L 9.5%
of the EPA limit 2000 µg/L
 2/2 SYR4
Trichloroethylene
120 µg/L 2400%
of the EPA limit, in the worst sample — 5 µg/L
 2/2 SYR4
TTHM
58 µg/L 73%
of the EPA limit 80 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
22 µg/L 37%
of the EPA limit 60 µg/L
 2/2 SYR4
Chloroform
20 µg/L
No EPA limit set
 2/2 SYR4
Bromodichloromethane
18 µg/L
No EPA limit set
 2/2 SYR4
Dibromochloromethane
17 µg/L
No EPA limit set
 2/2 SYR4
Tetrachloroethylene
16 µg/L 320%
of the EPA limit, in the worst sample — 5 µg/L
 2/2 SYR4
Dichloroacetic Acid
12 µg/L
No EPA limit set
 1/2 SYR4
Di(2-ethylhexyl) Phthalate
11 µg/L 183%
of the EPA limit, in the worst sample — 6 µg/L
 1/2 SYR4
Trichloroacetic Acid
6.4 µg/L
No EPA limit set
 1/2 SYR4
Carbon Tetrachloride
6.3 µg/L 126%
of the EPA limit, in the worst sample — 5 µg/L
 1/2 SYR4
Combined Uranium
5.96 µg/L 20%
of the EPA limit 30 µg/L
 2/2 SYR4
Bromoform
5.3 µg/L
No EPA limit set
 2/2 SYR4
1,1-Dichloroethylene
3.6 µg/L 51%
of the EPA limit 7 µg/L
 1/2 SYR4
1,2-Dichloroethane
3.6 µg/L 72%
of the EPA limit 5 µg/L
 1/2 SYR4
Dibromoacetic Acid
3.4 µg/L
No EPA limit set
 2/2 SYR4
Gross Beta Particle Activity
3.1 pCi/L
No EPA limit set
 1/2 SYR4
Dichloromethane
2.4 µg/L 48%
of the EPA limit 5 µg/L
 2/2 SYR4
Arsenic
2.3 µg/L 23%
of the EPA limit 10 µg/L
 1/2 SYR4
cis-1,2-Dichloroethylene
2.1 µg/L 3%
of the EPA limit 70 µg/L
 1/2 SYR4
Pentachlorophenol
0.8100 µg/L 81%
of the EPA limit 1 µg/L
 1/2 SYR4
trans-1,2-Dichloroethylene
0.8000 µg/L 0.8%
of the EPA limit 100 µg/L
 1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — 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

SupplierPopulation 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 highest level found 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.