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MARYSVILLE, CITY OF

PWS ID: MI0004160 · MARYSVILLE, Michigan 48040

MARYSVILLE, CITY OF serves 9,959 people in MARYSVILLE, Michigan using Surface Water water sources. It has 234 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: MARYSVILLE, CITY OF

MARYSVILLE, CITY OF is a local-owned community water system that delivers drinking water to 9,959 residents in MARYSVILLE, Michigan (St. Clair County) through 2,296 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 234 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 228 monitoring and reporting violations are on file. The most recent violation on record dates to 2010.

The most frequently cited contaminant at this system is Endrin, recorded in 8 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 Michigan, EPA tracks 10,959 public water systems serving 9,098,093 people, with 255,201 cumulative violations and 31,467 health-based violations on record. About 86% of systems in the state carry at least one violation, and state-wide the average per system is 23.3 violations. MARYSVILLE, CITY OF's 234 violations sit above the Michigan average. Statewide, 87 of 318 UCMR5-tested systems have reported PFAS detections (27.4%). 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
9,959
Total Violations
234
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
2,296
County
St. Clair
School/Daycare
No
MCL Violations
0
Monitoring Violations
228
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Endrin MR 8 2010
Picloram MR 8 2010
Hexachlorocyclopentadiene MR 8 2010
Aldicarb sulfoxide MR 8 2010
Aldicarb sulfone MR 8 2010
Heptachlor MR 8 2010
Heptachlor epoxide MR 8 2010
2,4-D MR 8 2010
HEXACHLOROBENZENE MR 8 2010
Pentachlorophenol MR 8 2010
Toxaphene MR 8 2010
Simazine MR 8 2010
Dinoseb MR 8 2010
Aldicarb MR 8 2010
Atrazine MR 8 2010
Total Polychlorinated Biphenyls (PCB) MR 8 2010
LASSO MR 8 2010
BHC-GAMMA MR 8 2010
Methoxychlor MR 8 2010
OXAMYL MR 8 2010
Carbofuran MR 8 2010
2,4,5-TP MR 8 2010
Chlordane MR 8 2010
Coliform (TCR) MR 4 2003
Dalapon MR 4 2004
Diquat MR 4 2004
Endothall MR 4 2004
Glyphosate MR 4 2004
Di(2-ethylhexyl) adipate MR 4 2004
2,3,7,8-TCDD MR 4 2004

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
NFDHA 8/12/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFTA 8/12/2025 <0.008 µg/L 0.008 µg/L Not Detected
lithium 8/12/2025 <9 µg/L 9 µg/L Not Detected
PFBS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/12/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHpS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 8/12/2025 <0.007 µg/L 0.007 µg/L Not Detected
6:2 FTS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
NEtFOSAA 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
8:2 FTS 8/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 5/13/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFMPA 5/13/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 5/13/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 5/13/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 5/13/2025 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 5/13/2025 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 5/13/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 5/13/2025 <9 µg/L 9 µg/L Not Detected
PFHpS 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 5/13/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFBS 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/13/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 5/13/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 5/13/2025 <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 OF.

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 MI0004160 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Michigan Drinking Water Authority

Michigan EGLE — Drinking Water and Environmental Health Division is the primacy agency that licenses and inspects MARYSVILLE, CITY OF under EPA-delegated authority.

Open MI regulator portal

Source: Michigan EGLE — Drinking Water and Environmental Health Division

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
2010 Endrin MR 8 SDWIS / MI0004160 / 2005
2010 Picloram MR 8 SDWIS / MI0004160 / 2040
2010 Hexachlorocyclopentadiene MR 8 SDWIS / MI0004160 / 2042
2010 Aldicarb sulfoxide MR 8 SDWIS / MI0004160 / 2043
2010 Aldicarb sulfone MR 8 SDWIS / MI0004160 / 2044
2010 Heptachlor MR 8 SDWIS / MI0004160 / 2065
2010 Heptachlor epoxide MR 8 SDWIS / MI0004160 / 2067
2010 2,4-D MR 8 SDWIS / MI0004160 / 2105
2010 HEXACHLOROBENZENE MR 8 SDWIS / MI0004160 / 2274
2010 Pentachlorophenol MR 8 SDWIS / MI0004160 / 2326
2010 Toxaphene MR 8 SDWIS / MI0004160 / 2020
2010 Simazine MR 8 SDWIS / MI0004160 / 2037
2010 Dinoseb MR 8 SDWIS / MI0004160 / 2041
2010 Aldicarb MR 8 SDWIS / MI0004160 / 2047
2010 Atrazine MR 8 SDWIS / MI0004160 / 2050

How MARYSVILLE, CITY OF Compares

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

Metric MARYSVILLE, CITY OF Michigan avg Federal benchmark
Total violations 234 23.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 2.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 27.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 9,959 830 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,959 regulated public water systems in Michigan.

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 OF water safe to drink? ▼
MARYSVILLE, CITY OF (PWS ID: MI0004160) has 234 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 9,959 people using Surface Water sources.
How many people does MARYSVILLE, CITY OF serve? ▼
MARYSVILLE, CITY OF serves 9,959 people in MARYSVILLE, Michigan. It is a Local-owned system using Surface Water water sources with 2,296 service connections.
What type of violations does MARYSVILLE, CITY OF have? ▼
MARYSVILLE, CITY OF has 234 total violations: 0 health-based violations (MCL exceedances or treatment failures), 228 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in MARYSVILLE, CITY OF water? ▼
No. MARYSVILLE, CITY OF was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does MARYSVILLE, CITY OF use? ▼
MARYSVILLE, CITY OF 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.

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

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