Water Quality Report · Updated October 07, 2026
HAMILTON PUBLIC WATER SYSTEM
HAMILTON PUBLIC WATER SYSTEM delivers tap water graded A (85/100) by TapWaterSafety.org. The utility serves approximately 62,447 residents in FAIRFIELD, Ohio using groundwater. 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.
Is FAIRFIELD tap water safe to drink?
HAMILTON PUBLIC WATER SYSTEM delivers tap water that earns a grade of A (85/100) from TapWaterSafety.org — an excellent rating reflecting minimal contamination and full compliance with health guidelines.
The utility serves 62,447 residents in FAIRFIELD, drawing from groundwater.
Public testing data identifies 7 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Chromium (hexavalent), Dibromoacetic acid, Chlorite, Haloacetic acids (HAA5), Nitrate and nitrite, Nitrate. 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.
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.
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 HAMILTON PUBLIC WATER SYSTEM.
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.
Contact HAMILTON PUBLIC WATER SYSTEM
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 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.
Score breakdown
This utility's overall score of 85/100 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 (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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
HAMILTON PUBLIC WATER SYSTEM service area
This water system serves 1 community in Butler County, Ohio. 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.