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Community Water System · PWS MO1010179

Coffey PWS

Coffey, Missouri 64636-0000 - drinking water served from groundwater sources to 166 people, tracked in EPA SDWIS and UCMR5.

166
People served
112
EPA violations
31
Health-based
Untested
UCMR5 result

The verdict

EPA records 112 drinking-water violations at Coffey PWS, 28% of them health-based - above the Missouri per-system average.

112
Total EPA violations on record
28%
Health-based (MCL / treatment failure)
166
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Coffey PWS

Coffey PWS is a local-owned community water system that delivers drinking water to 166 residents in Coffey, Missouri (Daviess County) through 60 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 112 total violations for this system , of which 31 (28%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 53 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is TTHM, recorded in 28 violations (MCL, health-based). 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, 71 of 230 UCMR5-tested systems have reported PFAS detections (30.9%).

Coffey PWS's 112 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
166
Total Violations
112
Health-Based Violations
31
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
60
County
Daviess
School/Daycare
No
MCL Violations
31
Monitoring Violations
53
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 28 2017
Coliform (TCR) MR 18 2015
Coliform (TCR) MCL 3 1997
Lead and Copper Rule MR 2 2024
1,1,1-Trichloroethane MR 1 1996
Chromium MR 1 1996
Thallium, Total MR 1 1996
CYANIDE MR 1 1996
o-Dichlorobenzene MR 1 1996
1,2-Dichloroethane MR 1 1996
1,2,4-Trichlorobenzene MR 1 1996
cis-1,2-Dichloroethylene MR 1 1996
Arsenic MR 1 1996
Tetrachloroethylene MR 1 1996
DICHLOROMETHANE MR 1 1996
Vinyl chloride MR 1 1996
Antimony, Total MR 1 1996
Xylenes, Total MR 1 1996
1,1-Dichloroethylene MR 1 1996
trans-1,2-Dichloroethylene MR 1 1996
Beryllium, Total MR 1 1996
Styrene MR 1 1996
1,2-Dichloropropane MR 1 1996
Trichloroethylene MR 1 1996
p-Dichlorobenzene MR 1 1996
Fluoride MR 1 1996
Cadmium MR 1 1996
Nickel MR 1 1996
Barium MR 1 1996
CHLOROBENZENE MR 1 1996

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 Coffey 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 MO1010179 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 Coffey 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
2024 Lead and Copper Rule MR 2 SDWIS / MO1010179 / 5000
2017 TTHM MCL 28 SDWIS / MO1010179 / 2950
2015 Coliform (TCR) MR 18 SDWIS / MO1010179 / 3100
1997 Coliform (TCR) MCL 3 SDWIS / MO1010179 / 3100
1996 1,1,1-Trichloroethane MR 1 SDWIS / MO1010179 / 2981
1996 Chromium MR 1 SDWIS / MO1010179 / 1020
1996 Thallium, Total MR 1 SDWIS / MO1010179 / 1085
1996 CYANIDE MR 1 SDWIS / MO1010179 / 1024
1996 o-Dichlorobenzene MR 1 SDWIS / MO1010179 / 2968
1996 1,2-Dichloroethane MR 1 SDWIS / MO1010179 / 2980
1996 1,2,4-Trichlorobenzene MR 1 SDWIS / MO1010179 / 2378
1996 cis-1,2-Dichloroethylene MR 1 SDWIS / MO1010179 / 2380
1996 Arsenic MR 1 SDWIS / MO1010179 / 1005
1996 Tetrachloroethylene MR 1 SDWIS / MO1010179 / 2987
1996 DICHLOROMETHANE MR 1 SDWIS / MO1010179 / 2964

How Coffey PWS Compares

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

Metric Coffey PWS Missouri avg Federal benchmark
Total violations 112 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 31 19.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 30.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 166 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 Coffey PWS water safe to drink? ▼
Coffey PWS (PWS ID: MO1010179) has 112 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 166 people using Groundwater sources.
How many people does Coffey PWS serve? ▼
Coffey PWS serves 166 people in Coffey, Missouri. It is a Local-owned system using Groundwater water sources with 60 service connections.
What type of violations does Coffey PWS have? ▼
Coffey PWS has 112 total violations: 31 health-based violations (MCL exceedances or treatment failures), 53 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Coffey PWS water? ▼
No PFAS testing data is available for Coffey PWS under the EPA's UCMR5 monitoring program.
What water source does Coffey PWS use? ▼
Coffey 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.