Tap Water Quality Report
Tap water quality in FAIRFIELD, Ohio
Tap water in FAIRFIELD, Ohio receives a grade of B (85/100) from TapWaterSafety.org. It's served by HAMILTON PUBLIC WATER SYSTEM. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Dibromoacetic acid significantly above health guideline. 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 (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 1.1 ppb, 18x above the EWG health guideline of 0.06 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 0.33 ppb, 17x above the EWG health guideline of 0.02 ppb.
Dibromoacetic acid significantly above health guideline
Moderate concernDibromoacetic acid detected at 0.517 ppb, 17x above the EWG health guideline of 0.03 ppb.
EPA compliance record
Official U.S. EPA records for HAMILTON PUBLIC WATER SYSTEM (system ID OH0904012) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 04/01/2025 | Open |
| Consumer Confidence Rule | Other (e.g. public notice) | 12/30/2025 | 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.
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 (HAA9) Disinfection byproduct |
1.1 ppb | 0.06 | — | — | — | — | — | 18× over |
| Chromium (hexavalent) Heavy metal |
0.33 ppb | 0.02 | — | — | — | — | — | 17× over |
| Dibromoacetic acid Disinfection byproduct |
0.517 ppb | 0.03 | — | — | — | — | — | 17× over |
| Chlorite Disinfection byproduct |
520.1 ppb | 50.0 | 1000.0 | — | — | — | — | 10× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
0.567 ppb | 0.1 | 60.0 | 60 | — | — | — | 5.7× over |
| Nitrate and nitrite Inorganic |
0.62 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 4.4× over |
| Nitrate Inorganic |
0.592 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 4.2× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.1 ppb | 0.15 | 80.0 | 100 | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.177 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Chlorate Disinfection byproduct |
51.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0857 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
43.1 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Chloroform Disinfection byproduct |
0.0243 ppb | 0.4 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.35 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.41 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.725 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.333 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.3 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.13 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.118 ppb | — | — | — | — | — | — | Below guideline |
| Cyanide Inorganic |
5.5 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Fluoride Inorganic |
0.82 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 HAMILTON PUBLIC WATER SYSTEM.