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Community Water System · PWS MO4010137

Cardwell PWS

Cardwell, Missouri 63829-0000 - drinking water served from groundwater sources to 533 people, tracked in EPA SDWIS and UCMR5.

533
People served
152
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 152 drinking-water violations at Cardwell PWS - above the Missouri per-system average.

152
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
533
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cardwell PWS

Cardwell PWS is a local-owned community water system that delivers drinking water to 533 residents in Cardwell, Missouri (Dunklin County) through 296 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 152 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 141 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 30 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%).

Cardwell PWS's 152 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
533
Total Violations
152
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
296
County
Dunklin
School/Daycare
No
MCL Violations
0
Monitoring Violations
141
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 30 2011
Revised Total Coliform Rule MON 28 2025
TTHM MR 16 2022
Total Haloacetic Acids (HAA5) MR 16 2022
Consumer Confidence Rule Other 7 2024
cis-1,2-Dichloroethylene MR 2 2025
p-Dichlorobenzene MR 2 2025
Vinyl chloride MR 2 2025
trans-1,2-Dichloroethylene MR 2 2025
1,2-Dichloroethane MR 2 2025
1,1,1-Trichloroethane MR 2 2025
1,2-Dichloropropane MR 2 2025
1,1,2-Trichloroethane MR 2 2025
Tetrachloroethylene MR 2 2025
CHLOROBENZENE MR 2 2025
Styrene MR 2 2025
1,1-Dichloroethylene MR 2 2025
Benzene MR 2 2025
DICHLOROMETHANE MR 2 2025
Trichloroethylene MR 2 2025
Carbon tetrachloride MR 2 2025
Ethylbenzene MR 2 2025
Xylenes, Total MR 2 2025
Toluene MR 2 2025
1,2,4-Trichlorobenzene MR 2 2025
Cadmium MR 1 2017
Thallium, Total MR 1 2017
Barium MR 1 2017
Chromium MR 1 2017
Mercury MR 1 2017

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 Cardwell 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 MO4010137 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 Cardwell 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 28 SDWIS / MO4010137 / 8000
2025 cis-1,2-Dichloroethylene MR 2 SDWIS / MO4010137 / 2380
2025 p-Dichlorobenzene MR 2 SDWIS / MO4010137 / 2969
2025 Vinyl chloride MR 2 SDWIS / MO4010137 / 2976
2025 trans-1,2-Dichloroethylene MR 2 SDWIS / MO4010137 / 2979
2025 1,2-Dichloroethane MR 2 SDWIS / MO4010137 / 2980
2025 1,1,1-Trichloroethane MR 2 SDWIS / MO4010137 / 2981
2025 1,2-Dichloropropane MR 2 SDWIS / MO4010137 / 2983
2025 1,1,2-Trichloroethane MR 2 SDWIS / MO4010137 / 2985
2025 Tetrachloroethylene MR 2 SDWIS / MO4010137 / 2987
2025 CHLOROBENZENE MR 2 SDWIS / MO4010137 / 2989
2025 Styrene MR 2 SDWIS / MO4010137 / 2996
2025 1,1-Dichloroethylene MR 2 SDWIS / MO4010137 / 2977
2025 Benzene MR 2 SDWIS / MO4010137 / 2990
2025 DICHLOROMETHANE MR 2 SDWIS / MO4010137 / 2964

How Cardwell PWS Compares

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

Metric Cardwell PWS Missouri avg Federal benchmark
Total violations 152 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 533 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 Cardwell PWS water safe to drink? ▼
Cardwell PWS (PWS ID: MO4010137) has 152 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 533 people using Groundwater sources.
How many people does Cardwell PWS serve? ▼
Cardwell PWS serves 533 people in Cardwell, Missouri. It is a Local-owned system using Groundwater water sources with 296 service connections.
What type of violations does Cardwell PWS have? ▼
Cardwell PWS has 152 total violations: 0 health-based violations (MCL exceedances or treatment failures), 141 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cardwell PWS water? ▼
No PFAS testing data is available for Cardwell PWS under the EPA's UCMR5 monitoring program.
What water source does Cardwell PWS use? ▼
Cardwell 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.