Public water system · OH2503411

Active

Westerville City Pws

At a glance

Westerville City Pws (PWSID OH2503411) is an active community water system in Franklin County, Ohio. It reports serving 39,000 people through 13,624 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, 3 are health-based, and the most recent began in January 2016.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

39,000

Service connections

13,624

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDOH2503411

System typeCommunity water system

Activity statusActive

Population served39,000

Service connections13,624

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyOH state drinking water program

City served—

StateOhio

ZIP—

CountyFranklin County

How does Westerville City Pws compare with other water systems in Franklin County?

By EPA's size categories, Westerville City Pws is a large system (10,001 to 100,000 people). Franklin County has 90 active public water systems, and Westerville City Pws is the 2nd-largest of them by population served. Its population served is about 134% above the county average of 16,670 people per system, and accounts for 2.6% of the 1,500,285 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 Westerville City Pws is about 5.8 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 Westerville City Pws?

EPA lists Westerville 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. 19 of the 90 active systems in Franklin County (21%) are also owned by a local government.

Does Westerville City Pws have drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in January 2016. The violations listed here began between October 1982 and January 2016. By type: 9 monitoring and reporting and 3 contaminant level above the legal limit. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 of them). EPA lists 6 as resolved and 6 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
2016-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2015-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2015-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2004-05-01	Monitoring and reportingMonitoring, Regular · code 03	Atrazinecode 2050	No	Resolved
2004-05-01	Monitoring and reportingMonitoring, Regular · code 03	Alachlor (Lasso)code 2051	No	Resolved
2004-05-01	Monitoring and reportingMonitoring, Regular · code 03	Simazinecode 2037	No	Resolved
1982-10-01	Monitoring and reportingMonitoring, Regular · code 03	Bariumcode 1010	No	Archived
1982-10-01	Monitoring and reportingMonitoring, Regular · code 03	Arseniccode 1005	No	Archived
1982-10-01	Monitoring and reportingMonitoring, Regular · code 03	Mercurycode 1035	No	Archived
1982-10-01	Monitoring and reportingMonitoring, Regular · code 03	Chromiumcode 1020	No	Archived
1982-10-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Archived
1982-10-01	Monitoring and reportingMonitoring, Regular · code 03	Cadmiumcode 1015	No	Archived

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.

Westerville City Pws: frequently asked questions

Who runs Westerville City Pws?

Westerville City Pws (PWSID OH2503411) is a community water system owned by a local government. It is regulated by the OH state drinking water program.

How many people does Westerville City Pws serve?

Westerville City Pws reports serving 39,000 people through 13,624 service connections in Franklin County, Ohio.

Where does Westerville 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 Westerville City Pws have any drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in January 2016. 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 Westerville 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. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in January 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.

Where can I find Westerville City Pws' water quality report?

As a community water system, Westerville 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 Franklin County

Water system	County	Population served	Type	Source
Columbus Public Water System	Franklin	1,305,946	Community	Surface water
Reynoldsburg City Pws	Franklin	37,847	Community	Purchased surface water
Gahanna City Pws	Franklin	33,258	Community	Purchased surface water
Bexley City Pws	Franklin	14,250	Community	Purchased surface water
Jefferson Water and Sewer District Pws	Franklin	11,294	Community	Groundwater
Canal Winchester City Pws	Franklin	9,286	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, “Westerville City Pws, PWSID OH2503411, Ohio”, https://aquacensus.com/water-systems/ohio/westerville-city-pws-oh2503411 (data as of October 1, 2026).