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Community Water System · PWS OH5100414

Aqua Ohio - Marion

Marion, Ohio 43302-4155 - drinking water served from surface water sources to 46,317 people, tracked in EPA SDWIS and UCMR5.

46,317
People served
20
EPA violations
4
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 20 drinking-water violations at Aqua Ohio - Marion, 20% of them health-based - below the Ohio per-system average.

20
Total EPA violations on record
20%
Health-based (MCL / treatment failure)
46,317
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Aqua Ohio - Marion

Aqua Ohio - Marion is a private-owned community water system that delivers drinking water to 46,317 residents in Marion, Ohio (Marion County) through 18,735 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 20 total violations for this system , of which 4 (20%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 8 monitoring and reporting violations are on file. The most recent violation on record dates to 2004.

The most frequently cited contaminant at this system is Gross Beta Particle Activity, recorded in 4 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Ohio, EPA tracks 4,181 public water systems serving 11,085,226 people, with 288,388 cumulative violations and 52,412 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 204 of 346 UCMR5-tested systems have reported PFAS detections (59%).

Aqua Ohio - Marion's 20 violations sit below the Ohio average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
46,317
Total Violations
20
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
18,735
County
Marion
School/Daycare
No
MCL Violations
0
Monitoring Violations
8
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Beta Particle Activity MR 4 2002
Interim Enhanced Surface Water Treatment Rule TT 4 2003
2,4-D MR 4 2000
Consumer Confidence Rule Other 2 2004

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
11Cl-PF3OUdS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/12/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/12/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 9/12/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 9/12/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFOA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
9Cl-PF3ONS 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFOS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 6/7/2023 <7.00 ppt 7.00 ppt Not Detected
PFDoA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/7/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 6/7/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 6/7/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 6/7/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 6/7/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/7/2023 <6.00 ppt 6.00 ppt Not Detected
4:2 FTS 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 6/7/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/7/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 6/7/2023 <20.00 ppt 20.00 ppt Not Detected
8:2 FTS 6/7/2023 <5.00 ppt 5.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Aqua Ohio - Marion.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID OH5100414 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Ohio Drinking Water Authority

Ohio EPA, Division of Drinking and Ground Waters is the primacy agency that licenses and inspects Aqua Ohio - Marion under EPA-delegated authority.

Open OH regulator portal

Source: Ohio EPA, Division of Drinking and Ground Waters

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2004 Consumer Confidence Rule Other 2 SDWIS / OH5100414 / 7000
2003 Interim Enhanced Surface Water Treatment Rule TT 4 SDWIS / OH5100414 / 0300
2002 Gross Beta Particle Activity MR 4 SDWIS / OH5100414 / 4100
2000 2,4-D MR 4 SDWIS / OH5100414 / 2105

How Aqua Ohio - Marion Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Aqua Ohio - Marion Ohio avg Federal benchmark
Total violations 20 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 12.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 59% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 46,317 2,651 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,181 regulated public water systems in Ohio.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Aqua Ohio - Marion water safe to drink? ▼
Aqua Ohio - Marion (PWS ID: OH5100414) has 20 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 46,317 people using Surface Water sources.
How many people does Aqua Ohio - Marion serve? ▼
Aqua Ohio - Marion serves 46,317 people in Marion, Ohio. It is a Private-owned system using Surface Water water sources with 18,735 service connections.
What type of violations does Aqua Ohio - Marion have? ▼
Aqua Ohio - Marion has 20 total violations: 4 health-based violations (MCL exceedances or treatment failures), 8 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Aqua Ohio - Marion water? ▼
No. Aqua Ohio - Marion was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Aqua Ohio - Marion use? ▼
Aqua Ohio - Marion uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.