Community Water System · PWS MO1010546
Mosby PWS
Operator location Mosby, Missouri - 65% of 185 violations are health-based (upper-third health share (> 23%)); surface water source; 115 served per SDWIS.
- 115
- People served (this PWS)
- 185
- EPA violations (this PWS)
- 121
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mosby PWS standing, high SDWIS violation third
65% of 185 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 65% is upper-third health share (> 23%).
The verdict
Mosby PWS sits in the upper third of the sitemap cohort by violation count (185), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (115; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 65% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 185
- Total EPA violations on record
- 65%
- Health-based (MCL / treatment failure)
- 115
- 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
- Community
- Owner Type
- Local
- Connections
- 48
- County
- Clay
- School/Daycare
- No
- MCL Violations
- 119
- Monitoring Violations
- 38
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 116 | 2025 |
| Coliform (TCR) | MR | 23 | 2009 |
| Consumer Confidence Rule | Other | 9 | 2023 |
| TTHM | MR | 5 | 2020 |
| Revised Total Coliform Rule | MON | 5 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2020 |
| Public Notice | Other | 4 | 2025 |
| Coliform (TCR) | MCL | 3 | 1993 |
| Groundwater Rule | TT | 2 | 2010 |
Violation Count vs. the National Corpus
Mosby PWS has 185 recorded EPA violations, 84% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 16% carry more. 65% of this system's own violations are health-based (121 of 185), 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)
185 Higher than most more violations than 84% 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 Mosby PWS
121 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MO1010546.
Sources: EPA SDWIS · Missouri DNR, Public Drinking Water Branch
Nationwide peers
185 violations · 115 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 Mosby PWS
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.