Public water system · OH4700911

Active

Oberlin Water Department

At a glance

Oberlin Water Department (PWSID OH4700911) is an active community water system in Lorain County, Ohio. It reports serving 8,600 people through 2,593 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in March 2024.

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

Population served

8,600

Service connections

2,593

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDOH4700911

System typeCommunity water system

Activity statusActive

Population served8,600

Service connections2,593

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyOH state drinking water program

City served—

StateOhio

ZIP—

CountyLorain County

How does Oberlin Water Department compare with other water systems in Lorain County?

By EPA's size categories, Oberlin Water Department is a medium system (3,301 to 10,000 people). Lorain County has 16 active public water systems. Its population served is about 58% below the county average of 20,599 people per system, and accounts for 2.6% of the 329,580 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 Oberlin Water Department is about 28% above 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 Oberlin Water Department?

EPA lists Oberlin Water Department 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. 12 of the 16 active systems in Lorain County (75%) are also owned by a local government.

Does Oberlin Water Department have drinking water violations?

EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in March 2024. The violations listed here began between July 1996 and March 2024. By type: 3 required treatment not met, 3 contaminant level above the legal limit, 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 of them). EPA lists 8 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2024-03-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2018-09-14	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Unaddressed
2017-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2011-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2011-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2005-05-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
2005-01-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1996-07-01	Monitoring and reportingMonitoring, Regular · code 03	Fluoridecode 1025	No	Resolved
1996-07-01	Monitoring and reportingMonitoring, Regular · code 03	Arseniccode 1005	No	Resolved

All 9 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.

Oberlin Water Department: frequently asked questions

Who runs Oberlin Water Department?

Oberlin Water Department (PWSID OH4700911) is a community water system owned by a local government. It is regulated by the OH state drinking water program.

How many people does Oberlin Water Department serve?

Oberlin Water Department reports serving 8,600 people through 2,593 service connections in Lorain County, Ohio.

Where does Oberlin Water Department 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 Oberlin Water Department have any drinking water violations?

EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in March 2024. 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 Oberlin Water Department'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. EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in March 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.

Where can I find Oberlin Water Department's water quality report?

As a community water system, Oberlin Water Department 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 Lorain County

Water system	County	Population served	Type	Source
Rural Lorain Co. Water A	Lorain	73,125	Community	Purchased surface water
Elyria Water Department	Lorain	68,000	Community	Surface water
Lorain City Pws	Lorain	64,152	Community	Surface water
North Ridgeville City Pws	Lorain	29,465	Community	Purchased surface water
Avon City Pws	Lorain	23,800	Community	Purchased surface water
Avon Lake City Pws	Lorain	23,659	Community	Surface water

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Oberlin Water Department, PWSID OH4700911, Ohio”, https://aquacensus.com/water-systems/ohio/oberlin-water-department-oh4700911 (data as of October 1, 2026).