Community Water System · PWS WA5397750
Winthrop Town Of
Operator location Winthrop, Washington - 15% of 27 violations are health-based (middle-third health share (≤ 23%)); groundwater source; 1,350 served per SDWIS.
- 1,350
- People served (this PWS)
- 27
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Winthrop Town Of standing, mid SDWIS violation third
15% of 27 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 #16,870 of 29,740 among systems serving 500+.
The verdict
Winthrop Town Of lands in the middle third by violation volume (27), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,350 (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.
- #16,870 of 29,740
- Population · /systems
- #436 of 766
- Population · WA
- 27
- 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
- Local
- Connections
- 484
- County
- Okanogan
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 20
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 11 | 2022 |
| Revised Total Coliform Rule | MON | 4 | 2024 |
| Coliform (TCR) | MCL | 4 | 2003 |
| Consumer Confidence Rule | Other | 3 | 2024 |
| Nitrate | MR | 2 | 2024 |
| Coliform (TCR) | MR | 2 | 2003 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
Violation Count vs. the National Corpus
Winthrop Town Of has 27 recorded EPA violations, 39% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 60% carry more. 15% of this system's own violations are health-based (4 of 27), and it ranks #16,870 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)
27 Lower than most fewer violations than 60% 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 Winthrop Town Of
4 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WA5397750.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
27 violations · 1,350 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 Winthrop Town Of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Washington compares on the same EPA violation measures. Washington 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.