Public water system · OH7400614

Active

Aqua Ohio - Tiffin

At a glance

Aqua Ohio - Tiffin (PWSID OH7400614) is an active community water system in Seneca County, Ohio. It reports serving 20,279 people through 8,311 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in December 2019.

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

Population served

20,279

Service connections

8,311

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDOH7400614

System typeCommunity water system

Activity statusActive

Population served20,279

Service connections8,311

Primary water sourceSurface water

Owner typePrivate

Primacy agencyOH state drinking water program

City served—

StateOhio

ZIP—

CountySeneca County

How does Aqua Ohio - Tiffin compare with other water systems in Seneca County?

By EPA's size categories, Aqua Ohio - Tiffin is a large system (10,001 to 100,000 people). Seneca County has 56 active public water systems, and Aqua Ohio - Tiffin is the largest of them by population served. Its population served is about 25 times the county average of 826 people per system, and accounts for 44% 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 Aqua Ohio - Tiffin is about 3 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 Aqua Ohio - Tiffin?

EPA lists Aqua Ohio - Tiffin as privately owned. 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. 49 of the 56 active systems in Seneca County (88%) are also privately owned.

Does Aqua Ohio - Tiffin have drinking water violations?

EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in December 2019. The violations listed here began between July 1993 and December 2019. By type: 6 required treatment not met, 3 monitoring and reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Surface Water Treatment Rule (6 of them). EPA lists 10 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
2019-12-30	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Unaddressed
2010-01-02	Monitoring and reportingFailure Submit IDSE/Subpart V Plan Rpt · code 35	Stage 2 Disinfectants and Disinfection Byproducts Rulecode 0600	No	Resolved
2008-10-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Total trihalomethanes (TTHM)code 2950	No	Resolved
2008-10-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Haloacetic acids (HAA5)code 2456	No	Resolved
2002-12-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
1993-12-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1993-11-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1993-10-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1993-09-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1993-08-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
1993-07-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved

All 11 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.

Aqua Ohio - Tiffin: frequently asked questions

Who runs Aqua Ohio - Tiffin?

Aqua Ohio - Tiffin (PWSID OH7400614) is a community water system privately owned. It is regulated by the OH state drinking water program.

How many people does Aqua Ohio - Tiffin serve?

Aqua Ohio - Tiffin reports serving 20,279 people through 8,311 service connections in Seneca County, Ohio.

Where does Aqua Ohio - Tiffin 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 Aqua Ohio - Tiffin have any drinking water violations?

EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in December 2019. 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 Aqua Ohio - Tiffin'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 11 violations for this system; 7 are health-based, and the most recent began in December 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the OH state drinking water program.

Where can I find Aqua Ohio - Tiffin's water quality report?

As a community water system, Aqua Ohio - Tiffin 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
Fostoria City	Seneca	13,441	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, “Aqua Ohio - Tiffin, PWSID OH7400614, Ohio”, https://aquacensus.com/water-systems/ohio/aqua-ohio-tiffin-oh7400614 (data as of October 1, 2026).