Tap Water Quality Report
Tap water quality in FAIRFIELD, California
Tap water in FAIRFIELD, California receives a grade of F (59/100) from TapWaterSafety.org. It's served by CITY OF FAIRFIELD. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in FAIRFIELD's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving FAIRFIELD.
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.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 18.8 ppb, 314x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 39.0 ppb, 260x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.228 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF FAIRFIELD (system ID CA4810003) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Lead and Copper Rule Revisions | Missed reporting | 10/17/2024 | Open |
| Lead and Copper Rule Revisions | Required treatment not met | 10/17/2024 | Open |
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 FAIRFIELD
Filters matched to the specific contaminants in FAIRFIELD's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
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 FAIRFIELD'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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
18.8 ppb | 0.06 | — | — | — | — | — | 314× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
39.0 ppb | 0.15 | 80.0 | 100 | — | — | — | 260× over |
| Bromodichloromethane Disinfection byproduct |
9.29 ppb | 0.06 | — | — | — | — | — | 155× over |
| Chloroform Disinfection byproduct |
25.3 ppb | 0.4 | — | — | — | — | — | 63× over |
| Arsenic Heavy metal |
0.228 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 57× over |
| Trichloroacetic acid Disinfection byproduct |
5.53 ppb | 0.1 | — | — | — | — | — | 55× over |
| Dibromochloromethane Disinfection byproduct |
4.89 ppb | 0.1 | — | — | — | — | — | 49× over |
| Dichloroacetic acid Disinfection byproduct |
4.25 ppb | 0.2 | — | — | — | — | — | 21× over |
| Dibromoacetic acid Disinfection byproduct |
0.351 ppb | 0.03 | — | — | — | — | — | 12× over |
| Chromium (hexavalent) Heavy metal |
0.121 ppb | 0.02 | — | — | — | — | — | 6.0× over |
| Nitrate Inorganic |
0.175 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.2× over |
| Nitrate and nitrite Inorganic |
0.157 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.1× over |
| Bromoform Disinfection byproduct |
0.321 ppb | 0.5 | — | — | — | — | — | Below guideline |
| 1,2,3-Trichloropropane Other |
0.000197 ppb | 0.0007 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
29.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
39.7 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Vanadium Other |
1.01 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.552 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.178 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.117 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0563 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.263 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.165 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 4-Androstene-3,17-dione Other |
0.115 ppt | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.342 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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 FAIRFIELD.