Water Quality Report · Updated October 07, 2026
BUTLER CO. WATER DISTRICT 2 PWS
BUTLER CO. WATER DISTRICT 2 PWS delivers tap water graded C (71/100) by TapWaterSafety.org. The utility serves approximately 116,572 residents in HAMILTON, Ohio using surface water (purchased). The most significant water quality concerns are: Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 513-887-3929.
Is HAMILTON tap water safe to drink?
BUTLER CO. WATER DISTRICT 2 PWS delivers tap water that earns a grade of C (71/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 116,572 residents in HAMILTON, drawing from surface water (purchased).
Public testing data identifies 13 contaminants in this water above EWG's health-based guidelines, including: Perfluorohexane sulfonate (PFHXS), Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Bromodichloromethane, Bromochloroacetic acid, Dibromoacetic acid, Dibromochloromethane, Haloacetic acids (HAA5), Chloroform, Bromoform, Dichloroacetic acid, Chromium (hexavalent), Trichloroacetic acid. 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 BUTLER CO. WATER DISTRICT 2 PWS (system ID OH0900303) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Public Notice Rule and Revised PN Rule | Other (e.g. public notice) | 08/14/2024 | Open |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 04/01/2023 | 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 HAMILTON residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for BUTLER CO. WATER DISTRICT 2 PWS.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.94 ppt, 940x above the EWG health guideline of 0.001 ppt.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 31.1 ppb, 207x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 8.23 ppb, 137x above the EWG health guideline of 0.06 ppb.
Contact BUTLER CO. WATER DISTRICT 2 PWS
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 HAMILTON
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 like TTHM. Look for NSF/ANSI 53 VOC or chloroform 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 71/100 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 |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.94 ppt | 0.001 | 10.0 | — | — | — | — | 940× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
31.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 207× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
8.23 ppb | 0.06 | — | — | — | — | — | 137× over |
| Bromodichloromethane Disinfection byproduct |
8.03 ppb | 0.06 | — | — | — | — | — | 134× over |
| Bromochloroacetic acid Disinfection byproduct |
2.36 ppb | 0.02 | — | — | — | — | — | 118× over |
| Dibromoacetic acid Disinfection byproduct |
3.23 ppb | 0.03 | — | — | — | — | — | 108× over |
| Dibromochloromethane Disinfection byproduct |
10.6 ppb | 0.1 | — | — | — | — | — | 106× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
5.61 ppb | 0.1 | 60.0 | 60 | — | — | — | 56× over |
| Chloroform Disinfection byproduct |
6.07 ppb | 0.4 | — | — | — | — | — | 15× over |
| Bromoform Disinfection byproduct |
6.46 ppb | 0.5 | — | — | — | — | — | 13× over |
| Dichloroacetic acid Disinfection byproduct |
2.11 ppb | 0.2 | — | — | — | — | — | 11× over |
| Chromium (hexavalent) Heavy metal |
0.203 ppb | 0.02 | — | — | — | — | — | 10× over |
| Trichloroacetic acid Disinfection byproduct |
0.45 ppb | 0.1 | — | — | — | — | — | 4.5× over |
| 1,4-Dioxane Semi-volatile organic compound |
0.222 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Chlorate Disinfection byproduct |
77.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.1 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.39 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.8 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.3 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.152 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.0417 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.
BUTLER CO. WATER DISTRICT 2 PWS 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 HAMILTON water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.