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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 level at the main supplier 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 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-Nitrite
788000 µg/L 7880%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Nitrate
7141.6 µg/L 71%
of the EPA limit 10000 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Fluoride
470 µg/L 12%
of the EPA limit 4000 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Barium
160.9 µg/L 8%
of the EPA limit 2000 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
TTHM
45.88 µg/L 57%
of the EPA limit 80 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Lithium
38.456 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2025
1/1 UCMR-5
Total Haloacetic Acids (HAA5)
18.89 µg/L 31%
of the EPA limit 60 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Chloroform
17.11 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Bromodichloromethane
14.2 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Dibromochloromethane
13.29 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Dichloroacetic Acid
9.54 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Combined Uranium
7.9566 µg/L 27%
of the EPA limit 30 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Bromoform
7.35 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Trichloroacetic Acid
6.22 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Dibromoacetic Acid
4.21 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Arsenic
3.45 µg/L 35%
of the EPA limit 10 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Monobromoacetic Acid
3.09 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
Monochloroacetic Acid
2.875 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
1,1-Dichloroethylene
0.7850 µg/L 11%
of the EPA limit 7 µg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2019
1/1 SYR4
PFOS
0.0142 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2025
1/1 UCMR-5
PFOA
0.0089 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2025
1/1 UCMR-5
PFHXS
0.0084 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2025
1/1 UCMR-5
Pfpea
0.0059 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2025
1/1 UCMR-5
Pfhxa
0.0040 µg/L
No EPA limit set
Main supplier: CITY OF SANTA ANA · 310,539 people · 2025
1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF SANTA ANA · 310,539 people · 2024
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 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 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.