Water Quality Report · Updated May 12, 2026
CITY OF TUSTIN
CITY OF TUSTIN delivers tap water graded F (52/100) by TapWaterSafety.org. The utility serves approximately 66,600 residents in TUSTIN, California using surface water (purchased). 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. For questions, the utility can be reached at 714-361-4719.
Is TUSTIN tap water safe to drink?
CITY OF TUSTIN delivers tap water that earns a grade of F (52/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 66,600 residents in TUSTIN, drawing from surface water (purchased).
Public testing data identifies 17 contaminants in this water above EWG's health-based guidelines, including: Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Bromodichloromethane, Dibromochloromethane, Dibromoacetic acid, Haloacetic acids (HAA9), Nitrate, Nitrate and nitrite, Trichloroacetic acid, Chloroform, Dichloroacetic acid, Bromoform, Chromium (hexavalent), Uranium. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for TUSTIN residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CITY OF 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.
Contact CITY OF TUSTIN
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for TUSTIN
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 52/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CITY OF TUSTIN service area
This water system serves 1 community in Orange County, California. Click any city for its dedicated tap water quality page.
Find the right filter for TUSTIN water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.