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Transient Non-Community Water System · PWS MO5292331

Roys Store

Dora, Missouri 65637-0000 - drinking water served from groundwater sources to 100 people, tracked in EPA SDWIS and UCMR5.

100
People served
357
EPA violations
101
Health-based
Untested
UCMR5 result

The verdict

EPA records 357 drinking-water violations at Roys Store, 28% of them health-based - above the Missouri per-system average.

357
Total EPA violations on record
28%
Health-based (MCL / treatment failure)
100
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Roys Store

Roys Store is a private-owned transient non-community water system that delivers drinking water to 100 residents in Dora, Missouri (Ozark County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 357 total violations for this system , of which 101 (28%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 224 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 144 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%).

Roys Store's 357 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
100
Total Violations
357
Health-Based Violations
101
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
1
County
Ozark
School/Daycare
No
MCL Violations
98
Monitoring Violations
224
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 144 2014
Coliform (TCR) MCL 98 2014
Groundwater Rule MR 60 2025
Public Notice Other 30 2017
E. COLI MR 10 2010
Revised Total Coliform Rule MON 8 2024
Groundwater Rule TT 3 2014
Nitrate-Nitrite MR 2 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 Roys Store.

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 MO5292331 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 Roys Store 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 60 SDWIS / MO5292331 / 0700
2024 Revised Total Coliform Rule MON 8 SDWIS / MO5292331 / 8000
2017 Public Notice Other 30 SDWIS / MO5292331 / 7500
2014 Coliform (TCR) MR 144 SDWIS / MO5292331 / 3100
2014 Coliform (TCR) MCL 98 SDWIS / MO5292331 / 3100
2014 Groundwater Rule TT 3 SDWIS / MO5292331 / 0700
2010 E. COLI MR 10 SDWIS / MO5292331 / 3014
2008 Nitrate-Nitrite MR 2 SDWIS / MO5292331 / 1038

How Roys Store Compares

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

Metric Roys Store Missouri avg Federal benchmark
Total violations 357 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 101 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 100 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 Roys Store water safe to drink? ▼
Roys Store (PWS ID: MO5292331) has 357 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 100 people using Groundwater sources.
How many people does Roys Store serve? ▼
Roys Store serves 100 people in Dora, Missouri. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Roys Store have? ▼
Roys Store has 357 total violations: 101 health-based violations (MCL exceedances or treatment failures), 224 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Roys Store water? ▼
No PFAS testing data is available for Roys Store under the EPA's UCMR5 monitoring program.
What water source does Roys Store use? ▼
Roys Store uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.