C42/100
HAMILTON PUBLIC WATER SYSTEM — Water Quality Report 2026
Serving 62,447 people · Ohio
Water Source
Groundwater
County
—
System ID
OH0904012
Violations
15
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.005 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2025 – April 30, 2025Rule: Stage 1 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About HAMILTON PUBLIC WATER SYSTEM
Is HAMILTON PUBLIC WATER SYSTEM water safe to drink?
HAMILTON PUBLIC WATER SYSTEM water receives a grade of C (42/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 15 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HAMILTON PUBLIC WATER SYSTEM detected?
66 contaminants were tested in HAMILTON PUBLIC WATER SYSTEM's water. Notable contaminants include PFOA, Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does HAMILTON PUBLIC WATER SYSTEM have any EPA violations?
Yes, HAMILTON PUBLIC WATER SYSTEM has 15 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, Other, MCL. 8 are health-based violations.
How many people does HAMILTON PUBLIC WATER SYSTEM serve?
HAMILTON PUBLIC WATER SYSTEM serves approximately 62,447 people, Ohio.
What type of water does HAMILTON PUBLIC WATER SYSTEM provide?
HAMILTON PUBLIC WATER SYSTEM sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is OH0904012.
How does HAMILTON PUBLIC WATER SYSTEM compare to other utilities in Ohio?
HAMILTON PUBLIC WATER SYSTEM scores 42/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Ohio state page for a full comparison of water systems.