Public water system · OH5100414
ActiveAqua Ohio - Marion
At a glance
Aqua Ohio - Marion (PWSID OH5100414) is an active community water system in Marion County, Ohio. It reports serving 47,102 people through 18,841 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2004.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
47,102
Service connections
18,841
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Aqua Ohio - Marion compare with other water systems in Marion County?
By EPA's size categories, Aqua Ohio - Marion is a large system (10,001 to 100,000 people). Marion County has 28 active public water systems, and Aqua Ohio - Marion is the largest of them by population served. Its population served is about 25 times the county average of 1,873 people per system, and accounts for 90% of the 52,443 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 - Marion is about 7 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 - Marion?
EPA lists Aqua Ohio - Marion 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. 27 of the 28 active systems in Marion County (96%) are also privately owned.
Does Aqua Ohio - Marion have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2004. The violations listed here began between November 2000 and July 2004. By type: 2 monitoring and reporting, 1 public notice, recordkeeping or other and 1 required treatment not met. The contaminants or rules involved are Consumer Confidence Rule, Interim Enhanced Surface Water Treatment Rule, Gross Beta Particle Activity and 2,4-D. EPA lists 4 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 |
|---|---|---|---|---|
| 2004-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2003-09-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2002-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross Beta Particle Activitycode 4100 | No | Resolved |
| 2000-11-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,4-Dcode 2105 | No | Resolved |
All 4 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 - Marion: frequently asked questions
Who runs Aqua Ohio - Marion?
Aqua Ohio - Marion (PWSID OH5100414) is a community water system privately owned. It is regulated by the OH state drinking water program.
How many people does Aqua Ohio - Marion serve?
Aqua Ohio - Marion reports serving 47,102 people through 18,841 service connections in Marion County, Ohio.
Where does Aqua Ohio - Marion 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 - Marion have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2004. 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 - Marion'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 4 violations for this system; 1 is health-based, and the most recent began in July 2004. 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 - Marion's water quality report?
As a community water system, Aqua Ohio - Marion 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 Marion County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Elgin Local Schools Pws | Marion | 1,321 | Non-transient non-community | Groundwater |
| Aqua Ohio - La Rue Village Pws | Marion | 800 | Community | Groundwater |
| Ridgedale Jr/Sr High School | Marion | 465 | Non-transient non-community | Groundwater |
| Ridgedale Elementary School | Marion | 361 | Non-transient non-community | Groundwater |
| Cornerstone Alliance Church | Marion | 350 | Transient non-community | Groundwater |
| Marion Sunoco Pws | Marion | 250 | Transient non-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 - Marion, PWSID OH5100414, Ohio”, https://aquacensus.com/water-systems/ohio/aqua-ohio-marion-oh5100414 (data as of October 1, 2026).