Water Quality Report · Updated May 12, 2026
CITY OF FAIRFIELD
CITY OF FAIRFIELD delivers tap water graded C (67/100) by TapWaterSafety.org. The utility serves approximately 120,377 residents in FAIRFIELD, California using surface water. 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. For questions, the utility can be reached at 707-428-7485.
Is FAIRFIELD tap water safe to drink?
CITY OF FAIRFIELD delivers tap water that earns a grade of C (67/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 120,377 residents in FAIRFIELD, drawing from surface water.
Public testing data identifies 13 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA5), Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Bromodichloromethane, Chloroform, Arsenic, Trichloroacetic acid, Dibromochloromethane, Dichloroacetic acid, Dibromoacetic acid, Chromium (hexavalent), Nitrate, Nitrate and nitrite. 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 FAIRFIELD 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 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.
Contact CITY OF FAIRFIELD
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 FAIRFIELD
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
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 67/100 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 |
|---|---|---|---|---|---|---|---|---|
| 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CITY OF FAIRFIELD service area
This water system serves 1 community in Solano County, California. Click any city for its dedicated tap water quality page.
Find the right filter for FAIRFIELD water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.