Hamilton, OH: 36 Violations — 61/100 (2026)
6 ZIP codes · 10 water systems · Updated 2026-06-03
The systems supplying Hamilton vary in performance across OH benchmarks — most meet minimum federal standards, but documented violations in select areas are on record.
How Hamilton Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Hamilton, OH
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Hamilton.
Hamilton Water: The Quick Version
- Your city's water systems recorded 36 violations in the past 5 years.
- Average lead level: 0.0039 mg/L.
- Estimated remediation: $2,100 per household.
- CDC health risk index: 13.4 — above typical levels.
Water Systems Serving Hamilton
Across Hamilton, OH, residential water comes from 3 primary utilities rather than a single consolidated provider. Each system operates independently — managing its own distribution infrastructure, rate schedules, and EPA compliance filings. Federal records track 10 water systems in the area, with these top providers accounting for the majority of residential connections.
Overview
We track water quality and home safety data for 6 ZIP codes in Hamilton, Ohio (population ~139,271), covering 10 community water systems serving approximately 1,081,441 people region-wide.
6 of 6 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Hamilton: C (61/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Hamilton water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0039 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 6 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 14 | 6 |
| Surface Water Treatment Rule | Treatment Technique | 14 | 6 |
| Lead and Copper Rule | Treatment Technique | 7 | 6 |
| Consumer Confidence Report Rule | Reporting | 7 | 6 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 45011 | C | 6 | 0 | Butler Company Water District 2 Public Water System |
| 45012 | C | 6 | 0 | Butler Company Water District 2 Public Water System |
| 45013 | C | 6 | 0 | Southwest Regional Water District |
| 45015 | C | 6 | 0 | Butler Company Water District 2 Public Water System |
| 45025 | C | 6 | 0 | Butler Company Water District 2 Public Water System |
| 45026 | C | 6 | 0 | Butler Company Water District 2 Public Water System |
All ZIP Codes in Hamilton
- 45011 [C] — 6 violations
- 45012 [C] — 6 violations
- 45013 [C] — 6 violations
- 45015 [C] — 6 violations
- 45025 [C] — 6 violations
- 45026 [C] — 6 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Hamilton
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Hamilton
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Hamilton: Remediation Cost in Perspective
While no remediation project is entirely without cost, the relationship between estimated remediation and property values in Hamilton is notably favorable — the equity share is small enough that the household financial perspective is one of proportionality rather than pressure, and most homeowners can treat it as routine planning rather than a significant financial event.
Remediation costs in Hamilton are relatively low compared to home values. The $1,400–$2,800 estimated range is a small fraction of median property value. Home values are 18% above the Ohio average.
Protecting Children from Lead in Hamilton
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Hamilton appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Hamilton
Across the NFIP's long tracking period, Hamilton shows 118 claims and 50% of ZIP codes within FEMA-designated flood zones — figures that place it in moderate flood exposure territory. At this level, the water-quality implications of flooding — contaminated wells, stressed treatment intake, distribution backflow — move from theoretical edge cases to genuine periodic risks, particularly during higher-severity events.
Hamilton has a moderate flood history with 118 FEMA claims averaging $6,236 per payout. 50% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,100</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Hamilton
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Total Trihalomethanes (TTHM) can reduce the most common contaminant found in Hamilton's water.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Hamilton, OH