MARYSVILLE CITY PWS

Q: Is MARYSVILLE CITY PWS water safe to drink?

MARYSVILLE CITY PWS (PWS ID: OH8000314) has 110 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 25,571 people using Surface Water sources.

Q: What type of violations does MARYSVILLE CITY PWS have?

MARYSVILLE CITY PWS has 110 total violations: 63 health-based violations (MCL exceedances or treatment failures), 39 monitoring/reporting violations, and 59 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in MARYSVILLE CITY PWS water?

Yes. UCMR5 testing detected 1 PFAS compound in MARYSVILLE CITY PWS's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.

Q: What water source does MARYSVILLE CITY PWS use?

MARYSVILLE CITY PWS uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Q: 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.

Reviewed byPlainWater Editorial, Drinking Water Quality Editorial Team · June 3, 2026

PWS ID: OH8000314 · MARYSVILLE, Ohio 43040

MARYSVILLE CITY PWS serves 25,571 people in MARYSVILLE, Ohio using Surface Water water sources. It has 110 recorded EPA violations, including 63 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: MARYSVILLE CITY PWS

MARYSVILLE CITY PWS is a local-owned community water system that delivers drinking water to 25,571 residents in MARYSVILLE, Ohio (Union County) through 11,520 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 110 total violations for this system , of which 63 (57%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 39 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 55 violations (TT, health-based). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 13.4 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. MARYSVILLE CITY PWS's 110 violations sit above the Ohio average. Statewide, 204 of 346 UCMR5-tested systems have reported PFAS detections (59%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served

25,571

Total Violations

110

Health-Based Violations

Water Source

Surface Water

System Details

System Type: Community
Owner Type: Local
Connections: 11,520
County: Union
School/Daycare: No
MCL Violations: 4
Monitoring Violations: 39
Treatment Tech Violations: 59

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Surface Water Treatment Rule	TT	55	1997
LASSO	MR	9	2005
Atrazine	MR	9	2005
Simazine	MR	9	2005
Arsenic	MR	4	1996
Fluoride	MR	4	1996
Interim Enhanced Surface Water Treatment Rule	MR	4	2008
CARBON, TOTAL	TT	4	2011
Coliform (TCR)	MCL	4	1992
Consumer Confidence Rule	Other	1	2019

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 90 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFUnA	6/27/2023	<0.002 µg/L	0.002 µg/L	Not Detected
11Cl-PF3OUdS	6/27/2023	<0.005 µg/L	0.005 µg/L	Not Detected
9Cl-PF3ONS	6/27/2023	<0.002 µg/L	0.002 µg/L	Not Detected
ADONA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	6/27/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	6/27/2023	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMPA	6/27/2023	<0.004 µg/L	0.004 µg/L	Not Detected
6:2 FTS	6/27/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFDoA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFOA	6/27/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	6/27/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFNA	6/27/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxS	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpS	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeS	6/27/2023	<0.004 µg/L	0.004 µg/L	Not Detected
NFDHA	6/27/2023	<0.02 µg/L	0.02 µg/L	Not Detected
PFMBA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFEESA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	6/27/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFBS	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeA	6/27/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFTA	5/10/2023	<0.008 µg/L	0.008 µg/L	Not Detected
NMeFOSAA	5/10/2023	<0.006 µg/L	0.006 µg/L	Not Detected
NEtFOSAA	5/10/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFTrDA	5/10/2023	<0.007 µg/L	0.007 µg/L	Not Detected
lithium	5/10/2023	13.4000 µg/L	9 µg/L	Detected
NMeFOSAA	4/4/2024	<0.006 µg/L	0.006 µg/L	Not Detected
NEtFOSAA	4/4/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFTrDA	4/4/2024	<0.007 µg/L	0.007 µg/L	Not Detected
PFTA	4/4/2024	<0.008 µg/L	0.008 µg/L	Not Detected
PFMPA	3/6/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFHpA	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	3/6/2024	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
6:2 FTS	3/6/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	3/6/2024	<0.005 µg/L	0.005 µg/L	Not Detected
HFPO-DA	3/6/2024	<0.005 µg/L	0.005 µg/L	Not Detected
ADONA	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
9Cl-PF3ONS	3/6/2024	<0.002 µg/L	0.002 µg/L	Not Detected
PFUnA	3/6/2024	<0.002 µg/L	0.002 µg/L	Not Detected
PFDoA	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeA	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	3/6/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeS	3/6/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	3/6/2024	<0.004 µg/L	0.004 µg/L	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 MARYSVILLE CITY PWS.

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 OH8000314 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 MARYSVILLE CITY PWS 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
2019	Consumer Confidence Rule	Other	1	SDWIS / OH8000314 / 7000
2011	CARBON, TOTAL	TT	4	SDWIS / OH8000314 / 2920
2008	Interim Enhanced Surface Water Treatment Rule	MR	4	SDWIS / OH8000314 / 0300
2005	LASSO	MR	9	SDWIS / OH8000314 / 2051
2005	Atrazine	MR	9	SDWIS / OH8000314 / 2050
2005	Simazine	MR	9	SDWIS / OH8000314 / 2037
1997	Surface Water Treatment Rule	TT	55	SDWIS / OH8000314 / 0200
1996	Arsenic	MR	4	SDWIS / OH8000314 / 1005
1996	Fluoride	MR	4	SDWIS / OH8000314 / 1025
1992	Coliform (TCR)	MCL	4	SDWIS / OH8000314 / 3100

How MARYSVILLE CITY PWS Compares

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

Metric	MARYSVILLE CITY PWS	Ohio avg	Federal benchmark
Total violations	110	69	SDWA compliance — any non-zero count is a recorded breach
Health-based violations	63	12.5	Indicates a contaminant exceeded a federal MCL
PFAS detection	1 compound	59%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	25,571	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
Nitrate (as N)	10 mg/L	Acute health risk for infants

Frequently Asked Questions

Is MARYSVILLE CITY PWS water safe to drink? ▼

MARYSVILLE CITY PWS (PWS ID: OH8000314) has 110 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 25,571 people using Surface Water sources.

How many people does MARYSVILLE CITY PWS serve? ▼

MARYSVILLE CITY PWS serves 25,571 people in MARYSVILLE, Ohio. It is a Local-owned system using Surface Water water sources with 11,520 service connections.

What type of violations does MARYSVILLE CITY PWS have? ▼

MARYSVILLE CITY PWS has 110 total violations: 63 health-based violations (MCL exceedances or treatment failures), 39 monitoring/reporting violations, and 59 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in MARYSVILLE CITY PWS water? ▼

Yes. UCMR5 testing detected 1 PFAS compound in MARYSVILLE CITY PWS's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.

What water source does MARYSVILLE CITY PWS use? ▼

MARYSVILLE CITY PWS 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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial