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Community Water System · PWS MO4010170

Clarkton PWS

Clarkton, Missouri 63837-0000 - drinking water served from groundwater sources to 1,124 people, tracked in EPA SDWIS and UCMR5.

1,124
People served
145
EPA violations
43
Health-based
Untested
UCMR5 result

The verdict

EPA records 145 drinking-water violations at Clarkton PWS, 30% of them health-based - above the Missouri per-system average.

145
Total EPA violations on record
30%
Health-based (MCL / treatment failure)
1,124
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Clarkton PWS

Clarkton PWS is a local-owned community water system that delivers drinking water to 1,124 residents in Clarkton, Missouri (Dunklin County) through 499 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 145 total violations for this system , of which 43 (30%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 87 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 Coliform (TCR), recorded in 41 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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%).

Clarkton PWS's 145 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.

Population Served
1,124
Total Violations
145
Health-Based Violations
43
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
499
County
Dunklin
School/Daycare
No
MCL Violations
16
Monitoring Violations
87
Treatment Tech Violations
27

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 41 2015
Groundwater Rule TT 27 2022
Groundwater Rule MR 19 2024
Coliform (TCR) MCL 16 2015
Revised Total Coliform Rule MON 16 2025
Nitrate-Nitrite MR 9 2024
Consumer Confidence Rule Other 2 2020
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 2008
Public Notice Other 1 2022

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 Clarkton 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 MO4010170 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 Clarkton 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 Revised Total Coliform Rule MON 16 SDWIS / MO4010170 / 8000
2024 Groundwater Rule MR 19 SDWIS / MO4010170 / 0700
2024 Nitrate-Nitrite MR 9 SDWIS / MO4010170 / 1038
2022 Groundwater Rule TT 27 SDWIS / MO4010170 / 0700
2022 Public Notice Other 1 SDWIS / MO4010170 / 7500
2020 Consumer Confidence Rule Other 2 SDWIS / MO4010170 / 7000
2015 Coliform (TCR) MR 41 SDWIS / MO4010170 / 3100
2015 Coliform (TCR) MCL 16 SDWIS / MO4010170 / 3100
2008 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 SDWIS / MO4010170 / 0600

How Clarkton PWS Compares

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

Metric Clarkton PWS Missouri avg Federal benchmark
Total violations 145 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 43 19.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 70.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,124 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 Clarkton PWS water safe to drink? ▼
Clarkton PWS (PWS ID: MO4010170) has 145 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,124 people using Groundwater sources.
How many people does Clarkton PWS serve? ▼
Clarkton PWS serves 1,124 people in Clarkton, Missouri. It is a Local-owned system using Groundwater water sources with 499 service connections.
What type of violations does Clarkton PWS have? ▼
Clarkton PWS has 145 total violations: 43 health-based violations (MCL exceedances or treatment failures), 87 monitoring/reporting violations, and 27 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Clarkton PWS water? ▼
No PFAS testing data is available for Clarkton PWS under the EPA's UCMR5 monitoring program.
What water source does Clarkton PWS use? ▼
Clarkton PWS uses Groundwater 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. 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.