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

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
17000 µg/L 170%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 1/1 SYR4
Barium
160 µg/L 8%
of the EPA limit 2000 µg/L
 1/1 SYR4
Combined Uranium
15.9728 µg/L 53%
of the EPA limit 30 µg/L
 1/1 SYR4
Total Haloacetic Acids (HAA5)
15 µg/L 25%
of the EPA limit 60 µg/L
 1/1 SYR4
Trichloroacetic Acid
14 µg/L
No EPA limit set
 1/1 SYR4
Arsenic
9.7 µg/L 97%
of the EPA limit 10 µg/L
 1/1 SYR4
TTHM
8.3 µg/L 10%
of the EPA limit 80 µg/L
 1/1 SYR4
Bromoform
4.5 µg/L
No EPA limit set
 1/1 SYR4
Dibromochloromethane
3.2 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
3.1 µg/L
No EPA limit set
 1/1 SYR4
Dibromoacetic Acid
1.9 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
1.5 µg/L
No EPA limit set
 1/1 SYR4
Lead
1.1 µg/L 7.3%
of the EPA limit 15 µg/L
 1/1 SYR4
Chloroform
0.5300 µg/L
No EPA limit set
 1/1 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.1500 µg/L 75%
of the EPA limit 0.2000 µg/L
 1/1 SYR4
PFHXS
0.0590 µg/L
No EPA limit set
 1/1 UCMR-5
PFOS
0.0450 µg/L
No EPA limit set
 1/1 UCMR-5
PFOA
0.0330 µg/L
No EPA limit set
 1/1 UCMR-5
Pfpea
0.0270 µg/L
No EPA limit set
 1/1 UCMR-5
Pfhxa
0.0250 µg/L
No EPA limit set
 1/1 UCMR-5
6:2 Fts
0.0130 µg/L
No EPA limit set
 1/1 UCMR-5
Pfhpa
0.0120 µg/L
No EPA limit set
 1/1 UCMR-5
Pfba
0.0110 µg/L
No EPA limit set
 1/1 UCMR-5
Pfpes
0.0082 µg/L
No EPA limit set
 1/1 UCMR-5
PFBS
0.0078 µg/L
No EPA limit set
 1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 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 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 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, Total Haloacetic Acids (HAA5). 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.