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Tap water quality report

Atwater, CA

EPA monitoring detected 27 contaminants across the 1 water supplier serving Atwater. 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.

1
water supplier
29,479
people served
27
contaminants found
California rankings Lead in California PFAS in California

What was found in Atwater'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
8588 µg/L 86%
of the EPA limit 10000 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Fluoride
186 µg/L 4.7%
of the EPA limit 4000 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2018
1/1 SYR4
Barium
160 µg/L 8%
of the EPA limit 2000 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2018
1/1 SYR4
Combined Uranium
14.5352 µg/L 48%
of the EPA limit 30 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2015
1/1 SYR4
Arsenic
9.1 µg/L 91%
of the EPA limit 10 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2018
1/1 SYR4
TTHM
7.31 µg/L 9.1%
of the EPA limit 80 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
6.945 µg/L 12%
of the EPA limit 60 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Trichloroacetic Acid
5.9 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Bromoform
3.085 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Dichloroacetic Acid
3.07 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Dibromochloromethane
2.135 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.81 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Bromodichloromethane
1.37 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
Lead
1.1 µg/L 7.3%
of the EPA limit 15 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2015
1/1 SYR4
Chloroform
0.5290 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.1400 µg/L 70%
of the EPA limit 0.2000 µg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2019
1/1 SYR4
PFHXS
0.0590 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
PFOS
0.0450 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
PFOA
0.0330 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
Pfpea
0.0270 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
Pfhxa
0.0250 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
6:2 Fts
0.0130 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
Pfhpa
0.0120 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
Pfba
0.0110 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
Pfpes
0.0082 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
PFBS
0.0078 µg/L
No EPA limit set
Main supplier: CITY OF ATWATER · 29,479 people · 2024
1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF ATWATER · 29,479 people · 2025
1/1 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 Atwater

SupplierPopulation served
CITY OF ATWATER 29,479

Frequently asked questions about Atwater tap water

Is Atwater tap water safe to drink?

EPA testing detected 27 contaminants in the water serving Atwater. 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 Atwater?

1 public water supplier report drinking-water monitoring for Atwater, California to the EPA. Each is listed above with its population served.

What contaminants are in Atwater's water?

The contaminants EPA monitoring detected in Atwater include Nitrate, Fluoride, Barium, Combined Uranium, Arsenic. 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.