Public water system · OH2100311
ActiveDelaware City Pws
At a glance
Delaware City Pws (PWSID OH2100311) is an active community water system in Delaware County, Ohio. It reports serving 43,895 people through 16,216 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
43,895
Service connections
16,216
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Delaware City Pws compare with other water systems in Delaware County?
By EPA's size categories, Delaware City Pws is a large system (10,001 to 100,000 people). Delaware County has 4 active public water systems, and Delaware City Pws is the 2nd-largest of them by population served. Its population served is about 10% below the county average of 48,823 people per system, and accounts for 22% of the 195,293 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 Delaware City Pws is about 6.5 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 Delaware City Pws?
EPA lists Delaware City Pws 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. 2 of the 4 active systems in Delaware County (50%) are also owned by a local government.
Does Delaware City Pws have drinking water violations?
EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2025. The violations listed here began between January 1989 and July 2025. By type: 4 contaminant level above the legal limit, 1 reporting and 1 monitoring and reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 of them). EPA lists 5 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 2014-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2014-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2013-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2009-02-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 1989-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
All 6 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.
Delaware City Pws: frequently asked questions
Who runs Delaware City Pws?
Delaware City Pws (PWSID OH2100311) is a community water system owned by a local government. It is regulated by the OH state drinking water program.
How many people does Delaware City Pws serve?
Delaware City Pws reports serving 43,895 people through 16,216 service connections in Delaware County, Ohio.
Where does Delaware City Pws 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 Delaware City Pws have any drinking water violations?
EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2025. 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 Delaware City Pws' 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. EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.
Where can I find Delaware City Pws' water quality report?
As a community water system, Delaware City Pws 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 Delaware County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Del-Co Water Company, Inc.. | Delaware | 150,000 | Community | Surface water |
| Ashley Village Pws | Delaware | 1,198 | Community | Purchased surface water |
| River Community Church Pws | Delaware | 200 | Transient non-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, “Delaware City Pws, PWSID OH2100311, Ohio”, https://aquacensus.com/water-systems/ohio/delaware-city-pws-oh2100311 (data as of October 1, 2026).