Public water system · OH8601512
ActiveAqua Ohio - Seneca
At a glance
Aqua Ohio - Seneca (PWSID OH8601512) is an active community water system in Williams County, Ohio. It reports serving 750 people through 307 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 11 violations for this system; none is health-based, and the most recent began in August 2007.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
750
Service connections
307
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Aqua Ohio - Seneca compare with other water systems in Williams County?
By EPA's size categories, Aqua Ohio - Seneca is a small system (501 to 3,300 people). Williams County has 43 active public water systems. Its population served is about 19% above the county average of 628 people per system, and accounts for 2.8% of the 27,007 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 - Seneca is well below 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 3,446 Ohio systems (89%) list groundwater as their primary source.
Who owns and regulates Aqua Ohio - Seneca?
EPA lists Aqua Ohio - Seneca 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. 35 of the 43 active systems in Williams County (81%) are also privately owned.
Does Aqua Ohio - Seneca have drinking water violations?
EPA's records list 11 violations for this system; none is health-based, and the most recent began in August 2007. The violations listed here began between October 1984 and August 2007. By type: 10 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Total coliform bacteria (TCR), Consumer Confidence Rule, Cadmium and Fluoride. EPA lists 10 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 |
|---|---|---|---|---|
| 2007-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1986-09-16 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Resolved |
| 1984-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
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 - Seneca: frequently asked questions
Who runs Aqua Ohio - Seneca?
Aqua Ohio - Seneca (PWSID OH8601512) is a community water system privately owned. It is regulated by the OH state drinking water program.
How many people does Aqua Ohio - Seneca serve?
Aqua Ohio - Seneca reports serving 750 people through 307 service connections in Williams County, Ohio.
Where does Aqua Ohio - Seneca get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Aqua Ohio - Seneca have any drinking water violations?
EPA's records list 11 violations for this system; none is health-based, and the most recent began in August 2007. 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 - Seneca'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; none is health-based, and the most recent began in August 2007. 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 - Seneca's water quality report?
As a community water system, Aqua Ohio - Seneca 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 Williams County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Bryan City Pws | Williams | 8,729 | Community | Groundwater |
| Montpelier Village | Williams | 4,280 | Community | Groundwater |
| Edgerton Village | Williams | 1,881 | Community | Groundwater |
| West Unity Village | Williams | 1,760 | Community | Groundwater |
| Pioneer Village | Williams | 1,449 | Community | Groundwater |
| Stryker Village | Williams | 1,259 | 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 - Seneca, PWSID OH8601512, Ohio”, https://aquacensus.com/water-systems/ohio/aqua-ohio-seneca-oh8601512 (data as of October 1, 2026).