Community Water System · PWS OR4100312
Gaston, City Of
Operator location Gaston, Oregon - smaller served population (≤ 999) at 625 people served; 46 SDWIS violations on record from surface water sources.
- 625
- People served (this PWS)
- 46
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Gaston, City Of standing, mid SDWIS violation third
625 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). Population rank #25,712 of 29,740 among systems serving 500+.
The verdict
Gaston, City Of lands in the middle third by violation volume (46), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (625; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 2% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #25,712 of 29,740
- Population · /systems
- #316 of 373
- Population · OR
- 46
- Total EPA violations on record
- 2%
- 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
- 335
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 38
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MR | 11 | 2017 |
| TTHM | MR | 11 | 2017 |
| Lead and Copper Rule | MR | 8 | 2024 |
| Coliform (TCR) | MR | 6 | 2015 |
| Consumer Confidence Rule | Other | 4 | 2024 |
| Revised Total Coliform Rule | MON | 2 | 2016 |
| Coliform (TCR) | MCL | 1 | 1993 |
Violation Count vs. the National Corpus
Gaston, City Of has 46 recorded EPA violations, 54% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 45% carry more. 2% of this system's own violations are health-based (1 of 46), and it ranks #25,712 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)
46 Around the middle fewer violations than 45% 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 Gaston, City Of
EPA SDWIS lists 625 people served and 335 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
46 violations · 625 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
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 Gaston, 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.