Transient Non-Community Water System · PWS MO5292331
Roys Store
Operator location Dora, Missouri - 28% of 357 violations are health-based (upper-third health share (> 23%)); groundwater source; 100 served per SDWIS.
- 100
- People served (this PWS)
- 357
- EPA violations (this PWS)
- 101
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Roys Store standing, high SDWIS violation third
28% of 357 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 28% is upper-third health share (> 23%).
The verdict
Roys Store sits in the upper third of the sitemap cohort by violation count (357), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (100; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 28% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 357
- Total EPA violations on record
- 28%
- Health-based (MCL / treatment failure)
- 100
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
Roys Store has 357 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 28% of this system's own violations are health-based (101 of 357), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
357 Higher than most more violations than 93% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Roys Store
101 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MO5292331.
Sources: EPA SDWIS · Missouri DNR, Public Drinking Water Branch
Nationwide peers
357 violations · 100 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Roys Store
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Missouri compares on the same EPA violation measures. Missouri systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.