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Tap water quality report

Santa Ana, CA

EPA monitoring detected 25 contaminants across the 1 water supplier serving Santa Ana. 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
310,539
people served
25
contaminants found
California rankings Lead in California PFAS in California

What was found in Santa Ana'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-Nitrite
980000 µg/L 9800%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Nitrate
9860 µg/L 99%
of the EPA limit 10000 µg/L
 1/1 SYR4
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
 1/1 SYR4
Barium
169 µg/L 8.5%
of the EPA limit 2000 µg/L
 1/1 SYR4
TTHM
52.8 µg/L 66%
of the EPA limit 80 µg/L
 1/1 SYR4
Lithium
38.456 µg/L
No EPA limit set
 1/1 UCMR-5
Total Haloacetic Acids (HAA5)
23.5 µg/L 39%
of the EPA limit 60 µg/L
 1/1 SYR4
Chloroform
22.7 µg/L
No EPA limit set
 1/1 SYR4
Dibromochloromethane
16.9 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
16.7 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
13.9 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
13.4 µg/L
No EPA limit set
 1/1 SYR4
Combined Uranium
12.1882 µg/L 41%
of the EPA limit 30 µg/L
 1/1 SYR4
Trichloroacetic Acid
7.7 µg/L
No EPA limit set
 1/1 SYR4
Dibromoacetic Acid
5.5 µg/L
No EPA limit set
 1/1 SYR4
Arsenic
3.5 µg/L 35%
of the EPA limit 10 µg/L
 1/1 SYR4
Monobromoacetic Acid
3.2 µg/L
No EPA limit set
 1/1 SYR4
Monochloroacetic Acid
3.1 µg/L
No EPA limit set
 1/1 SYR4
1,1-Dichloroethylene
0.8000 µg/L 11%
of the EPA limit 7 µg/L
 1/1 SYR4
PFOS
0.0142 µg/L
No EPA limit set
 1/1 UCMR-5
PFOA
0.0089 µg/L
No EPA limit set
 1/1 UCMR-5
PFHXS
0.0084 µg/L
No EPA limit set
 1/1 UCMR-5
Pfpea
0.0059 µg/L
No EPA limit set
 1/1 UCMR-5
Pfhxa
0.0040 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 Santa Ana

SupplierPopulation served
CITY OF SANTA ANA 310,539

Frequently asked questions about Santa Ana tap water

Is Santa Ana tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Santa Ana. 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 Santa Ana?

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

What contaminants are in Santa Ana's water?

The contaminants EPA monitoring detected in Santa Ana include Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM. 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.