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Community Water System · PWS MO4010379

Hornersville PWS

Hornersville, Missouri 63855-0000 - drinking water served from groundwater sources to 526 people, tracked in EPA SDWIS and UCMR5.

526
People served
390
EPA violations
27
Health-based
Untested
UCMR5 result

The verdict

EPA records 390 drinking-water violations at Hornersville PWS, 7% of them health-based - above the Missouri per-system average.

390
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
526
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hornersville PWS

Hornersville PWS is a local-owned community water system that delivers drinking water to 526 residents in Hornersville, Missouri (Dunklin County) through 261 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 390 total violations for this system , of which 27 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 352 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 Coliform (TCR), recorded in 17 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, 162 of 230 UCMR5-tested systems have reported PFAS detections (70.4%).

Hornersville PWS's 390 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
526
Total Violations
390
Health-Based Violations
27
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
261
County
Dunklin
School/Daycare
No
MCL Violations
27
Monitoring Violations
352
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 17 2007
Barium MR 12 2021
Cadmium MR 12 2021
Chromium MR 12 2021
Mercury MR 12 2021
Antimony, Total MR 12 2021
Beryllium, Total MR 12 2021
Thallium, Total MR 12 2021
Selenium MR 12 2021
Arsenic MR 12 2021
Fluoride MR 12 2021
Revised Total Coliform Rule MON 7 2024
1,2,4-Trichlorobenzene MR 6 2008
cis-1,2-Dichloroethylene MR 6 2008
Xylenes, Total MR 6 2008
DICHLOROMETHANE MR 6 2008
o-Dichlorobenzene MR 6 2008
p-Dichlorobenzene MR 6 2008
Vinyl chloride MR 6 2008
1,1-Dichloroethylene MR 6 2008
trans-1,2-Dichloroethylene MR 6 2008
1,1,1-Trichloroethane MR 6 2008
Carbon tetrachloride MR 6 2008
1,2-Dichloropropane MR 6 2008
1,1,2-Trichloroethane MR 6 2008
Tetrachloroethylene MR 6 2008
CHLOROBENZENE MR 6 2008
Benzene MR 6 2008
Toluene MR 6 2008
Ethylbenzene MR 6 2008

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 Hornersville 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 MO4010379 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 Hornersville 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 Revised Total Coliform Rule MON 7 SDWIS / MO4010379 / 8000
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / MO4010379 / 5200
2023 Public Notice Other 1 SDWIS / MO4010379 / 7500
2021 Barium MR 12 SDWIS / MO4010379 / 1010
2021 Cadmium MR 12 SDWIS / MO4010379 / 1015
2021 Chromium MR 12 SDWIS / MO4010379 / 1020
2021 Mercury MR 12 SDWIS / MO4010379 / 1035
2021 Antimony, Total MR 12 SDWIS / MO4010379 / 1074
2021 Beryllium, Total MR 12 SDWIS / MO4010379 / 1075
2021 Thallium, Total MR 12 SDWIS / MO4010379 / 1085
2021 Selenium MR 12 SDWIS / MO4010379 / 1045
2021 Arsenic MR 12 SDWIS / MO4010379 / 1005
2021 Fluoride MR 12 SDWIS / MO4010379 / 1025
2019 Consumer Confidence Rule Other 4 SDWIS / MO4010379 / 7000
2018 Revised Total Coliform Rule MCL 6 SDWIS / MO4010379 / 8000

How Hornersville PWS Compares

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

Metric Hornersville PWS Missouri avg Federal benchmark
Total violations 390 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 27 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 526 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 Hornersville PWS water safe to drink? ▼
Hornersville PWS (PWS ID: MO4010379) has 390 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 526 people using Groundwater sources.
How many people does Hornersville PWS serve? ▼
Hornersville PWS serves 526 people in Hornersville, Missouri. It is a Local-owned system using Groundwater water sources with 261 service connections.
What type of violations does Hornersville PWS have? ▼
Hornersville PWS has 390 total violations: 27 health-based violations (MCL exceedances or treatment failures), 352 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hornersville PWS water? ▼
No PFAS testing data is available for Hornersville PWS under the EPA's UCMR5 monitoring program.
What water source does Hornersville PWS use? ▼
Hornersville 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.