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Community Water System · PWS MO4010993

Neelyville PWS

Nellyville, Missouri 63954-0000 - drinking water served from groundwater sources to 310 people, tracked in EPA SDWIS and UCMR5.

310
People served
187
EPA violations
8
Health-based
Untested
UCMR5 result

The verdict

EPA records 187 drinking-water violations at Neelyville PWS, 4% of them health-based - above the Missouri per-system average.

187
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
310
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Neelyville PWS

Neelyville PWS is a local-owned community water system that delivers drinking water to 310 residents in Nellyville, Missouri (Butler County) through 191 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 187 total violations for this system , of which 8 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 146 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 Revised Total Coliform Rule, recorded in 118 violations (MON). 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%).

Neelyville PWS's 187 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
310
Total Violations
187
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
191
County
Butler
School/Daycare
No
MCL Violations
4
Monitoring Violations
146
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 118 2025
Coliform (TCR) MR 14 2013
Lead and Copper Rule MR 13 2023
Consumer Confidence Rule Other 10 2023
Public Notice Other 8 2022
Coliform (TCR) MCL 4 2001
Groundwater Rule TT 4 2022
Nitrate-Nitrite MR 1 2006
Groundwater Rule 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 Neelyville 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 MO4010993 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 Neelyville 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 118 SDWIS / MO4010993 / 8000
2023 Lead and Copper Rule MR 13 SDWIS / MO4010993 / 5000
2023 Consumer Confidence Rule Other 10 SDWIS / MO4010993 / 7000
2022 Public Notice Other 8 SDWIS / MO4010993 / 7500
2022 Groundwater Rule TT 4 SDWIS / MO4010993 / 0700
2022 Groundwater Rule Other 1 SDWIS / MO4010993 / 0700
2013 Coliform (TCR) MR 14 SDWIS / MO4010993 / 3100
2006 Nitrate-Nitrite MR 1 SDWIS / MO4010993 / 1038
2001 Coliform (TCR) MCL 4 SDWIS / MO4010993 / 3100

How Neelyville PWS Compares

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

Metric Neelyville PWS Missouri avg Federal benchmark
Total violations 187 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 8 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 310 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 Neelyville PWS water safe to drink? ▼
Neelyville PWS (PWS ID: MO4010993) has 187 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 310 people using Groundwater sources.
How many people does Neelyville PWS serve? ▼
Neelyville PWS serves 310 people in Nellyville, Missouri. It is a Local-owned system using Groundwater water sources with 191 service connections.
What type of violations does Neelyville PWS have? ▼
Neelyville PWS has 187 total violations: 8 health-based violations (MCL exceedances or treatment failures), 146 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Neelyville PWS water? ▼
No PFAS testing data is available for Neelyville PWS under the EPA's UCMR5 monitoring program.
What water source does Neelyville PWS use? ▼
Neelyville 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.