C50/100
DAYTON PUBLIC WATER SYSTEM — Water Quality Report 2026
Serving 141,407 people · Ohio
Water Source
Surface Water
County
—
System ID
OH5703512
Violations
14
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 53.00 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.470 mg/L | 0.015 mg/L | Over Limit |
PFOS | 0.007 µg/L | 0.004 µg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2009.
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 DAYTON PUBLIC WATER SYSTEM
Is DAYTON PUBLIC WATER SYSTEM water safe to drink?
DAYTON PUBLIC WATER SYSTEM water receives a grade of C (50/100), which is considered fair. 3 contaminant(s) exceed EPA legal limits and 14 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has DAYTON PUBLIC WATER SYSTEM detected?
77 contaminants were tested in DAYTON PUBLIC WATER SYSTEM's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile), PFOS. 3 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does DAYTON PUBLIC WATER SYSTEM have any EPA violations?
Yes, DAYTON PUBLIC WATER SYSTEM has 14 EPA violation(s) on record, with the most recent in 2009. Violation types include TT, MR, Other. 3 are health-based violations.
How many people does DAYTON PUBLIC WATER SYSTEM serve?
DAYTON PUBLIC WATER SYSTEM serves approximately 141,407 people, Ohio.
What type of water does DAYTON PUBLIC WATER SYSTEM provide?
DAYTON PUBLIC WATER SYSTEM sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is OH5703512.
How does DAYTON PUBLIC WATER SYSTEM compare to other utilities in Ohio?
DAYTON PUBLIC WATER SYSTEM scores 50/100 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.