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Community Water System · PWS MO2010538

Monroe City PWS

Monroe, Missouri 63456-0000 - drinking water served from surface water sources to 2,500 people, tracked in EPA SDWIS and UCMR5.

2,500
People served
143
EPA violations
118
Health-based
1 PFAS
UCMR5 result

The verdict

EPA records 143 drinking-water violations at Monroe City PWS, 83% of them health-based - above the Missouri per-system average, and UCMR5 testing detected 1 PFAS compound.

143
Total EPA violations on record
83%
Health-based (MCL / treatment failure)
2,500
People served by this system
1
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Monroe City PWS

Monroe City PWS is a local-owned community water system that delivers drinking water to 2,500 residents in Monroe, Missouri (Monroe County) through 1,237 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 143 total violations for this system , of which 118 (83%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 14 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is TTHM, recorded in 52 violations (MCL, 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 5.4 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Missouri, EPA tracks 2,823 public water systems serving 5,855,885 people, with 201,695 cumulative violations and 54,821 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 71.4 violations. Statewide, 162 of 230 UCMR5-tested systems have reported PFAS detections (70.4%).

Monroe City PWS's 143 violations sit above the Missouri average.

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
2,500
Total Violations
143
Health-Based Violations
118
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,237
County
Monroe
School/Daycare
No
MCL Violations
60
Monitoring Violations
14
Treatment Tech Violations
58

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 52 2025
Interim Enhanced Surface Water Treatment Rule TT 50 2018
Surface Water Treatment Rule TT 8 1997
Total Haloacetic Acids (HAA5) MCL 5 2025
Public Notice Other 5 2025
LASSO MR 4 2022
Simazine MR 4 2022
Atrazine MR 4 2022
Atrazine MCL 3 1994
Coliform (TCR) MR 2 2001
Consumer Confidence Rule Other 1 2022

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFPeS 6/13/2023 <4.00 ppt 4.00 ppt Not Detected
ADONA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 6/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/13/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 6/13/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 6/13/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 6/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 6/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 6/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 6/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 6/13/2023 <8.00 ppt 8.00 ppt Not Detected
PFMPA 6/13/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 6/13/2023 <20.00 ppt 20.00 ppt Not Detected
PFMBA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 6/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/13/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/13/2023 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 6/13/2023 <7.00 ppt 7.00 ppt Not Detected
PFUnA 6/13/2023 <2.00 ppt 2.00 ppt Not Detected
PFDoA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 3/22/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 3/22/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 3/22/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 3/22/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 3/22/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 3/22/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 3/22/2023 <5.00 ppt 5.00 ppt Not Detected
PFMBA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 3/22/2023 <4.00 ppt 4.00 ppt Not Detected
NMeFOSAA 3/22/2023 <6.00 ppt 6.00 ppt Not Detected
PFHpS 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 3/22/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 3/22/2023 <8.00 ppt 8.00 ppt Not Detected
NFDHA 3/22/2023 <20.00 ppt 20.00 ppt Not Detected
PFHpA 3/22/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 3/22/2023 <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 Monroe 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 MO2010538 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Missouri Drinking Water Authority

Missouri DNR, Public Drinking Water Branch is the primacy agency that licenses and inspects Monroe City PWS under EPA-delegated authority.

Open MO regulator portal

Source: Missouri DNR, Public Drinking Water Branch

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
2025 TTHM MCL 52 SDWIS / MO2010538 / 2950
2025 Total Haloacetic Acids (HAA5) MCL 5 SDWIS / MO2010538 / 2456
2025 Public Notice Other 5 SDWIS / MO2010538 / 7500
2022 LASSO MR 4 SDWIS / MO2010538 / 2051
2022 Simazine MR 4 SDWIS / MO2010538 / 2037
2022 Atrazine MR 4 SDWIS / MO2010538 / 2050
2022 Consumer Confidence Rule Other 1 SDWIS / MO2010538 / 7000
2018 Interim Enhanced Surface Water Treatment Rule TT 50 SDWIS / MO2010538 / 0300
2001 Coliform (TCR) MR 2 SDWIS / MO2010538 / 3100
1997 Surface Water Treatment Rule TT 8 SDWIS / MO2010538 / 0200
1994 Atrazine MCL 3 SDWIS / MO2010538 / 2050

How Monroe City PWS Compares

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

Metric Monroe City PWS Missouri avg Federal benchmark
Total violations 143 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 118 19.4 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 70.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,500 2,074 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,823 regulated public water systems in Missouri.

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 Monroe City PWS water safe to drink? ▼
Monroe City PWS (PWS ID: MO2010538) has 143 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 2,500 people using Surface Water sources.
How many people does Monroe City PWS serve? ▼
Monroe City PWS serves 2,500 people in Monroe, Missouri. It is a Local-owned system using Surface Water water sources with 1,237 service connections.
What type of violations does Monroe City PWS have? ▼
Monroe City PWS has 143 total violations: 118 health-based violations (MCL exceedances or treatment failures), 14 monitoring/reporting violations, and 58 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Monroe City PWS water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in Monroe City PWS's water supply: PFBA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Monroe City PWS use? ▼
Monroe 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.
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.