Public water system · OH5703512
ActiveDayton Public Water System
At a glance
Dayton Public Water System (PWSID OH5703512) is an active community water system in Montgomery County, Ohio. It reports serving 141,407 people through 50,351 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in May 2009.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
141,407
Service connections
50,351
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Dayton Public Water System compare with other water systems in Montgomery County?
By EPA's size categories, Dayton Public Water System is a very large system (more than 100,000 people). Montgomery County has 69 active public water systems, and Dayton Public Water System is the 2nd-largest of them by population served. Its population served is about 19 times the county average of 7,574 people per system, and accounts for 27% of the 522,570 people reported by systems filed under the county. Across Ohio, the 3,854 active systems average 2,767 people each. Nationally, the average active community water system reports serving 6,703 people, so Dayton Public Water System is about 21 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Ohio has 1,028 active community water systems, 27% of the state's 3,854 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 102 Ohio systems (2.6%) list surface water as their primary source.
Who owns and regulates Dayton Public Water System?
EPA lists Dayton Public Water System as owned by a local government. The OH state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 21 of the 69 active systems in Montgomery County (30%) are also owned by a local government.
Does Dayton Public Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in May 2009. The violations listed here began between July 1994 and May 2009. By type: 10 monitoring and reporting, 1 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Surface Water Treatment Rule (4 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2009-05-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2004-12-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2003-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2002-05-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2002-05-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2002-05-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2001-05-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2001-05-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2001-05-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2000-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Dayton Public Water System: frequently asked questions
Who runs Dayton Public Water System?
Dayton Public Water System (PWSID OH5703512) is a community water system owned by a local government. It is regulated by the OH state drinking water program.
How many people does Dayton Public Water System serve?
Dayton Public Water System reports serving 141,407 people through 50,351 service connections in Montgomery County, Ohio.
Where does Dayton Public Water System get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Dayton Public Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in May 2009. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Dayton Public Water System's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in May 2009. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.
Where can I find Dayton Public Water System's water quality report?
As a community water system, Dayton Public Water System must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Montgomery County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Montgomery County Water Services 1 Pws | Montgomery | 150,207 | Community | Purchased surface water |
| Montgomery County Water Services 2 Pws | Montgomery | 83,033 | Community | Purchased surface water |
| Huber Heights Public Water System | Montgomery | 43,439 | Community | Groundwater |
| Miamisburg City Pws | Montgomery | 19,790 | Community | Groundwater |
| Englewood City Pws | Montgomery | 13,463 | Community | Groundwater |
| Oakwood City Pws | Montgomery | 9,572 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Dayton Public Water System, PWSID OH5703512, Ohio”, https://aquacensus.com/water-systems/ohio/dayton-public-water-system-oh5703512 (data as of October 1, 2026).