Public water system · OH7400411

Active

Fostoria City

At a glance

Fostoria City (PWSID OH7400411) is an active community water system in Seneca County, Ohio. It reports serving 13,441 people through 5,279 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, 6 are health-based, and the most recent began in November 2010.

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

Population served

13,441

Service connections

5,279

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDOH7400411

System typeCommunity water system

Activity statusActive

Population served13,441

Service connections5,279

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyOH state drinking water program

City served—

StateOhio

ZIP—

CountySeneca County

How does Fostoria City compare with other water systems in Seneca County?

By EPA's size categories, Fostoria City is a large system (10,001 to 100,000 people). Seneca County has 56 active public water systems, and Fostoria City is the 2nd-largest of them by population served. Its population served is about 16 times the county average of 826 people per system, and accounts for 29% of the 46,231 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 Fostoria City is about twice 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 Fostoria City?

EPA lists Fostoria City 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. 7 of the 56 active systems in Seneca County (13%) are also owned by a local government.

Does Fostoria City have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in November 2010. The violations listed here began between November 1995 and November 2010. By type: 6 required treatment not met, 4 monitoring and reporting and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (3 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
2010-11-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2009-02-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2009-01-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2005-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2005-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2002-02-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
2001-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Resolved
1999-05-01	Monitoring and reportingMonitoring, Regular · code 03	Alachlor (Lasso)code 2051	No	Resolved
1999-05-01	Monitoring and reportingMonitoring, Regular · code 03	Atrazinecode 2050	No	Resolved
1999-05-01	Monitoring and reportingMonitoring, Regular · code 03	Simazinecode 2037	No	Resolved
1997-12-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1995-11-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	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.

Fostoria City: frequently asked questions

Who runs Fostoria City?

Fostoria City (PWSID OH7400411) is a community water system owned by a local government. It is regulated by the OH state drinking water program.

How many people does Fostoria City serve?

Fostoria City reports serving 13,441 people through 5,279 service connections in Seneca County, Ohio.

Where does Fostoria City 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 Fostoria City have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in November 2010. 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 Fostoria City'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, 6 are health-based, and the most recent began in November 2010. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.

Where can I find Fostoria City's water quality report?

As a community water system, Fostoria City 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 Seneca County

Water system	County	Population served	Type	Source
Aqua Ohio - Tiffin	Seneca	20,279	Community	Surface water
Green Springs Village Pws	Seneca	1,592	Community	Purchased surface water
Attica Village	Seneca	1,148	Community	Surface water
Bloomville Village Pws	Seneca	956	Community	Groundwater
Hopewell-Loudon School	Seneca	890	Non-transient non-community	Groundwater
Bettsville Village	Seneca	692	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, “Fostoria City, PWSID OH7400411, Ohio”, https://aquacensus.com/water-systems/ohio/fostoria-city-oh7400411 (data as of October 1, 2026).