Community Water System · PWS OR4100313
La Water Co-Op
Operator location Gaston, Oregon - 15% of 39 violations are health-based (middle-third health share (≤ 23%)); surface water source; 2,500 served per SDWIS.
- 2,500
- People served (this PWS)
- 39
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
La Water Co-Op standing, mid SDWIS violation third
15% of 39 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 15% is middle-third health share (≤ 23%). Population rank #11,955 of 29,740 among systems serving 500+.
The verdict
La Water Co-Op lands in the middle third by violation volume (39), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,500 (mid served population (≤ 3,309)). Health-based share is 15% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #11,955 of 29,740
- Population · /systems
- #147 of 373
- Population · OR
- 39
- Total EPA violations on record
- 15%
- 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
- Private
- Connections
- 803
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 27
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 7 | 2025 |
| TTHM | MR | 7 | 2025 |
| Lead and Copper Rule | TT | 6 | 2002 |
| Lead and Copper Rule | MR | 6 | 2017 |
| Consumer Confidence Rule | Other | 1 | 2024 |
Violation Count vs. the National Corpus
La Water Co-Op has 39 recorded EPA violations, 50% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 50% carry more. 15% of this system's own violations are health-based (6 of 39), and it ranks #11,955 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)
39 Lower than most fewer violations than 50% 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 La Water Co-Op
6 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OR4100313.
Sources: EPA SDWIS
Nationwide peers
39 violations · 2,500 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with La Water Co-Op
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.