Community Water System · PWS OR4100546
Mount Vernon, City Of
Operator location Mount Vernon, Oregon - smaller served population (≤ 999) at 510 people served; 105 SDWIS violations on record from groundwater sources.
- 510
- People served (this PWS)
- 105
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mount Vernon, City Of standing, high SDWIS violation third
510 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). Population rank #28,389 of 29,740 among systems serving 500+.
The verdict
Mount Vernon, City Of sits in the upper third of the sitemap cohort by violation count (105), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (510; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 7% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #28,389 of 29,740
- Population · /systems
- #350 of 373
- Population · OR
- 105
- Total EPA violations on record
- 7%
- Health-based (MCL / treatment failure)
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
- 273
- County
- Grant
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 86
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 14 | 2007 |
| Consumer Confidence Rule | Other | 4 | 2025 |
| Nitrate | MR | 4 | 2002 |
| Coliform (TCR) | MCL | 4 | 2015 |
| Lead and Copper Rule | TT | 3 | 2002 |
| Methoxychlor | MR | 2 | 2005 |
| Total Polychlorinated Biphenyls (PCB) | MR | 2 | 2005 |
| HEXACHLOROBENZENE | MR | 2 | 2005 |
| Arsenic | MR | 1 | 2002 |
| Barium | MR | 1 | 2002 |
| Nitrite | MR | 1 | 2002 |
| DICHLOROMETHANE | MR | 1 | 2002 |
| 1,1-Dichloroethylene | MR | 1 | 2002 |
| trans-1,2-Dichloroethylene | MR | 1 | 2002 |
| 1,2-Dichloroethane | MR | 1 | 2002 |
| 1,1,1-Trichloroethane | MR | 1 | 2002 |
| 1,2-Dichloropropane | MR | 1 | 2002 |
| 1,1,2-Trichloroethane | MR | 1 | 2002 |
| Tetrachloroethylene | MR | 1 | 2002 |
| CHLOROBENZENE | MR | 1 | 2002 |
| Toluene | MR | 1 | 2002 |
| Ethylbenzene | MR | 1 | 2002 |
| Styrene | MR | 1 | 2002 |
| Endrin | MR | 1 | 2002 |
| BHC-GAMMA | MR | 1 | 2002 |
| Toxaphene | MR | 1 | 2002 |
| Dalapon | MR | 1 | 2002 |
| Endothall | MR | 1 | 2002 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2002 |
| Picloram | MR | 1 | 2002 |
Violation Count vs. the National Corpus
Mount Vernon, City Of has 105 recorded EPA violations, 74% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 26% carry more. 7% of this system's own violations are health-based (7 of 105), and it ranks #28,389 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
105 Around the middle fewer violations than 26% 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
Population served record for Mount Vernon, City Of
EPA SDWIS lists 510 people served and 273 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
105 violations · 510 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.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Mount Vernon, City Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oregon compares on the same EPA violation measures. Oregon 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.