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Community Water System · PWS MO4010527

Mill Spring PWS

Mill Spring, Missouri 63952-0000 - drinking water served from groundwater sources to 112 people, tracked in EPA SDWIS and UCMR5.

112
People served
313
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 313 drinking-water violations at Mill Spring PWS, 2% of them health-based - above the Missouri per-system average.

313
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
112
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mill Spring PWS

Mill Spring PWS is a local-owned community water system that delivers drinking water to 112 residents in Mill Spring, Missouri (Wayne County) through 63 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 313 total violations for this system , of which 6 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 285 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 Groundwater Rule, recorded in 48 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, 71 of 230 UCMR5-tested systems have reported PFAS detections (30.9%).

Mill Spring PWS's 313 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
112
Total Violations
313
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
63
County
Wayne
School/Daycare
No
MCL Violations
6
Monitoring Violations
285
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule MR 48 2025
Revised Total Coliform Rule MON 27 2023
Lead and Copper Rule MR 10 2018
Coliform (TCR) MR 9 2006
Nitrate-Nitrite MR 9 2021
TTHM MR 8 2022
Total Haloacetic Acids (HAA5) MR 8 2022
Consumer Confidence Rule Other 7 2023
Xylenes, Total MR 6 2017
DICHLOROMETHANE MR 6 2017
o-Dichlorobenzene MR 6 2017
p-Dichlorobenzene MR 6 2017
Vinyl chloride MR 6 2017
trans-1,2-Dichloroethylene MR 6 2017
1,2-Dichloroethane MR 6 2017
1,1,1-Trichloroethane MR 6 2017
1,2-Dichloropropane MR 6 2017
1,1,2-Trichloroethane MR 6 2017
Tetrachloroethylene MR 6 2017
Benzene MR 6 2017
Ethylbenzene MR 6 2017
Styrene MR 6 2017
Coliform (TCR) MCL 6 1999
1,1-Dichloroethylene MR 6 2017
cis-1,2-Dichloroethylene MR 6 2017
CHLOROBENZENE MR 6 2017
Toluene MR 6 2017
1,2,4-Trichlorobenzene MR 6 2017
Carbon tetrachloride MR 6 2017
Trichloroethylene MR 6 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 Mill Spring 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 MO4010527 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 Mill Spring 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 Groundwater Rule MR 48 SDWIS / MO4010527 / 0700
2023 Revised Total Coliform Rule MON 27 SDWIS / MO4010527 / 8000
2023 Consumer Confidence Rule Other 7 SDWIS / MO4010527 / 7000
2022 TTHM MR 8 SDWIS / MO4010527 / 2950
2022 Total Haloacetic Acids (HAA5) MR 8 SDWIS / MO4010527 / 2456
2021 Nitrate-Nitrite MR 9 SDWIS / MO4010527 / 1038
2020 Public Notice Other 1 SDWIS / MO4010527 / 7500
2018 Lead and Copper Rule MR 10 SDWIS / MO4010527 / 5000
2017 Xylenes, Total MR 6 SDWIS / MO4010527 / 2955
2017 DICHLOROMETHANE MR 6 SDWIS / MO4010527 / 2964
2017 o-Dichlorobenzene MR 6 SDWIS / MO4010527 / 2968
2017 p-Dichlorobenzene MR 6 SDWIS / MO4010527 / 2969
2017 Vinyl chloride MR 6 SDWIS / MO4010527 / 2976
2017 trans-1,2-Dichloroethylene MR 6 SDWIS / MO4010527 / 2979
2017 1,2-Dichloroethane MR 6 SDWIS / MO4010527 / 2980

How Mill Spring PWS Compares

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

Metric Mill Spring PWS Missouri avg Federal benchmark
Total violations 313 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 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 112 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 Mill Spring PWS water safe to drink? ▼
Mill Spring PWS (PWS ID: MO4010527) has 313 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 112 people using Groundwater sources.
How many people does Mill Spring PWS serve? ▼
Mill Spring PWS serves 112 people in Mill Spring, Missouri. It is a Local-owned system using Groundwater water sources with 63 service connections.
What type of violations does Mill Spring PWS have? ▼
Mill Spring PWS has 313 total violations: 6 health-based violations (MCL exceedances or treatment failures), 285 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mill Spring PWS water? ▼
No PFAS testing data is available for Mill Spring PWS under the EPA's UCMR5 monitoring program.
What water source does Mill Spring PWS use? ▼
Mill Spring 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.