Tap Water Quality Report
Tap water quality in TUSTIN, California
Tap water in TUSTIN, California receives a grade of F (57/100) from TapWaterSafety.org. It's served by CITY OF TUSTIN. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in TUSTIN's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving TUSTIN.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 4.87 ppt, 4870x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 23.3 ppb, 155x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF TUSTIN (system ID CA3010046) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for TUSTIN
Filters matched to the specific contaminants in TUSTIN's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in TUSTIN's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) PFAS |
5.43 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | EPA violation |
| Perfluorooctane sulfonate (PFOS) PFAS |
5.7 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Perfluorohexane sulfonate (PFHXS) PFAS |
4.87 ppt | 0.001 | 10.0 | — | — | — | — | 4870× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
23.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 155× over |
| Bromodichloromethane Disinfection byproduct |
6.39 ppb | 0.06 | — | — | — | — | — | 106× over |
| Dibromochloromethane Disinfection byproduct |
7.38 ppb | 0.1 | — | — | — | — | — | 74× over |
| Dibromoacetic acid Disinfection byproduct |
1.83 ppb | 0.03 | — | — | — | — | — | 61× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
3.21 ppb | 0.06 | — | — | — | — | — | 54× over |
| Nitrate Inorganic |
3.39 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 24× over |
| Nitrate and nitrite Inorganic |
3.29 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 23× over |
| Trichloroacetic acid Disinfection byproduct |
1.99 ppb | 0.1 | — | — | — | — | — | 20× over |
| Chloroform Disinfection byproduct |
5.71 ppb | 0.4 | — | — | — | — | — | 14× over |
| Dichloroacetic acid Disinfection byproduct |
2.8 ppb | 0.2 | — | — | — | — | — | 14× over |
| Bromoform Disinfection byproduct |
3.81 ppb | 0.5 | — | — | — | — | — | 7.6× over |
| Chromium (hexavalent) Heavy metal |
0.093 ppb | 0.02 | — | — | — | — | — | 4.7× over |
| Uranium Radiological |
1.17 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 2.7× over |
| Chlorate Disinfection byproduct |
55.2 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
7.5 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
2.96 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
0.105 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
67.8 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Selenium Heavy metal |
2.3 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0194 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Aluminum Heavy metal |
20.1 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Monobromoacetic acid* Disinfection byproduct |
0.465 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.0132 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.794 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
5.21 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
4.25 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
2.48 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
1.65 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
3.01 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.801 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Bromide Other |
201.4 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.171 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.0338 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
22.2 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CITY OF TUSTIN.