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Tap water quality report

Azusa, CA

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Azusa. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
110,079
people served
21
contaminants found
California rankings Lead in California PFAS in California

What was found in Azusa'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
12000 µg/L 120%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
2/2 SYR4
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Barium
222 µg/L 11%
of the EPA limit 2000 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
TTHM
68.4 µg/L 86%
of the EPA limit 80 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Chloroform
29 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Dibromochloromethane
25.9 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Bromoform
21.5 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
21.35 µg/L 36%
of the EPA limit 60 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Bromodichloromethane
18 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Arsenic
16 µg/L 160%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Dichloroacetic Acid
11.15 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Trichloroacetic Acid
9.735 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Dibromoacetic Acid
8.225 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Combined Uranium
5.4385 µg/L 18%
of the EPA limit 30 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2018
1/2 SYR4
Di(2-ethylhexyl) Phthalate
5.1 µg/L 85%
of the EPA limit 6 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Monobromoacetic Acid
1.58 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
Tetrachloroethylene
0.9975 µg/L 20%
of the EPA limit 5 µg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2019
1/2 SYR4
PFOA
0.0077 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024
1/2 UCMR-5
PFOS
0.0058 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024
1/2 UCMR-5
Pfhxa
0.0035 µg/L
No EPA limit set
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2024
1/2 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: AZUSA LIGHT AND WATER · 110,044 people · 2023
Highest in the city: 0.00044 mg/L — THE RIVER COMMUNITY · 35 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 Azusa

SupplierPopulation served
AZUSA LIGHT AND WATER 110,044
THE RIVER COMMUNITY 35

Frequently asked questions about Azusa tap water

Is Azusa tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Azusa. 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 Azusa?

2 public water suppliers report drinking-water monitoring for Azusa, California to the EPA. Each is listed above with its population served.

What contaminants are in Azusa's water?

The contaminants EPA monitoring detected in Azusa include Nitrate, Fluoride, Barium, TTHM, Chloroform. 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.