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Tap water quality report

Tustin, CA

EPA monitoring detected 23 contaminants across the 1 water supplier serving Tustin. 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
66,600
people served
23
contaminants found
California rankings Lead in California PFAS in California

What was found in Tustin'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
17895 µg/L 179%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Nitrate
17304.999999999996 µg/L 173%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Fluoride
230 µg/L 5.8%
of the EPA limit 4000 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
TTHM
48.46999999999999 µg/L 61%
of the EPA limit 80 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Lithium
37.934 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2025
1/1 UCMR-5
Total Haloacetic Acids (HAA5)
19.54 µg/L 33%
of the EPA limit 60 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Chloroform
16.380000000000003 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Dibromochloromethane
16.35 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Bromodichloromethane
14.125 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Bromoform
11.639999999999997 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Selenium
9.54 µg/L 19%
of the EPA limit 50 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Dichloroacetic Acid
9.2 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Trichloroacetic Acid
6.494999999999999 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Dibromoacetic Acid
5.784999999999999 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Lead
5.6 µg/L 37%
of the EPA limit 15 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Combined Uranium
3.494049999999999 µg/L 12%
of the EPA limit 30 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2018
1/1 SYR4
Monochloroacetic Acid
3.425 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
Main supplier: CITY OF TUSTIN · 66,600 people · 2019
1/1 SYR4
PFOS
0.0042 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2025
1/1 UCMR-5
Pfpea
0.0037 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2025
1/1 UCMR-5
PFHXS
0.0035 µg/L
No EPA limit set
Main supplier: CITY OF TUSTIN · 66,600 people · 2025
1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF TUSTIN · 66,600 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 Tustin

SupplierPopulation served
CITY OF TUSTIN 66,600

Frequently asked questions about Tustin tap water

Is Tustin tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Tustin. 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 Tustin?

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

What contaminants are in Tustin's water?

The contaminants EPA monitoring detected in Tustin 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.