Community Water System · PWS WA5397500
Winlock City Of
Operator location Winlock, Washington - larger served population (> 3,309) at 3,502 people served; 237 SDWIS violations on record from groundwater sources.
- 3,502
- People served (this PWS)
- 237
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Winlock City Of standing, high SDWIS violation third
3,502 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 3% is middle-third health share (≤ 23%). Population rank #9,604 of 29,740 among systems serving 500+.
The verdict
Winlock City Of sits in the upper third of the sitemap cohort by violation count (237), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (3,502; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #9,604 of 29,740
- Population · /systems
- #239 of 766
- Population · WA
- 237
- Total EPA violations on record
- 3%
- 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
- 1,040
- County
- Lewis
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 223
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 12 | 2007 |
| cis-1,2-Dichloroethylene | MR | 8 | 2008 |
| Vinyl chloride | MR | 8 | 2008 |
| 1,1-Dichloroethylene | MR | 8 | 2008 |
| trans-1,2-Dichloroethylene | MR | 8 | 2008 |
| 1,1,1-Trichloroethane | MR | 8 | 2008 |
| Carbon tetrachloride | MR | 8 | 2008 |
| 1,2-Dichloropropane | MR | 8 | 2008 |
| CHLOROBENZENE | MR | 8 | 2008 |
| Benzene | MR | 8 | 2008 |
| Toluene | MR | 8 | 2008 |
| Styrene | MR | 8 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 8 | 2008 |
| DICHLOROMETHANE | MR | 8 | 2008 |
| o-Dichlorobenzene | MR | 8 | 2008 |
| 1,1,2-Trichloroethane | MR | 8 | 2008 |
| Tetrachloroethylene | MR | 8 | 2008 |
| Ethylbenzene | MR | 8 | 2008 |
| p-Dichlorobenzene | MR | 8 | 2008 |
| Trichloroethylene | MR | 8 | 2008 |
| 1,2-Dichloroethane | MR | 8 | 2008 |
| Coliform (TCR) | MCL | 7 | 1998 |
| Consumer Confidence Rule | Other | 4 | 2014 |
| Coliform (TCR) | MR | 2 | 2010 |
| Pentachlorophenol | MR | 2 | 2008 |
| Arsenic | MR | 2 | 2005 |
| Selenium | MR | 2 | 2005 |
| Diquat | MR | 2 | 2006 |
| Cadmium | MR | 2 | 2005 |
| Barium | MR | 2 | 2005 |
Violation Count vs. the National Corpus
Winlock City Of has 237 recorded EPA violations, 88% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 12% carry more. 3% of this system's own violations are health-based (7 of 237), and it ranks #9,604 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)
237 Higher than most more violations than 88% 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 Winlock City Of
EPA SDWIS lists 3,502 people served and 1,040 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
237 violations · 3,502 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Winlock City 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.