Community Water System · PWS WA5320200
Duck Lake Water Association
Operator location Okanogan, Washington - smaller served population (≤ 999) at 635 people served; 62 SDWIS violations on record from groundwater sources.
- 635
- People served (this PWS)
- 62
- EPA violations (this PWS)
- 11
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Duck Lake Water Association standing, mid SDWIS violation third
635 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 18% is middle-third health share (≤ 23%). Population rank #25,576 of 29,740 among systems serving 500+.
The verdict
Duck Lake Water Association lands in the middle third by violation volume (62), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (635; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 18% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #25,576 of 29,740
- Population · /systems
- #662 of 766
- Population · WA
- 62
- Total EPA violations on record
- 18%
- 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
- 190
- County
- Okanogan
- School/Daycare
- No
- MCL Violations
- 11
- Monitoring Violations
- 49
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 11 | 1999 |
| Coliform (TCR) | MR | 9 | 1997 |
| Aldicarb | MR | 2 | 2008 |
| Carbofuran | MR | 2 | 2008 |
| Aldicarb sulfone | MR | 2 | 2008 |
| Aldicarb sulfoxide | MR | 2 | 2008 |
| OXAMYL | MR | 2 | 2008 |
| Consumer Confidence Rule | Other | 1 | 1999 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2011 |
| DICHLOROMETHANE | MR | 1 | 2011 |
| o-Dichlorobenzene | MR | 1 | 2011 |
| p-Dichlorobenzene | MR | 1 | 2011 |
| 1,2-Dichloroethane | MR | 1 | 2011 |
| 1,1,1-Trichloroethane | MR | 1 | 2011 |
| Carbon tetrachloride | MR | 1 | 2011 |
| Tetrachloroethylene | MR | 1 | 2011 |
| CHLOROBENZENE | MR | 1 | 2011 |
| Benzene | MR | 1 | 2011 |
| Toluene | MR | 1 | 2011 |
| Barium | MR | 1 | 1979 |
| Chromium | MR | 1 | 1979 |
| Mercury | MR | 1 | 1979 |
| Cadmium | MR | 1 | 1979 |
| Nitrate | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Arsenic | MR | 1 | 1979 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Selenium | MR | 1 | 1979 |
| 1,1-Dichloroethylene | MR | 1 | 2011 |
| Ethylbenzene | MR | 1 | 2011 |
Violation Count vs. the National Corpus
Duck Lake Water Association has 62 recorded EPA violations, 62% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 18% of this system's own violations are health-based (11 of 62), and it ranks #25,576 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)
62 Around the middle fewer violations than 37% 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 Duck Lake Water Association
EPA SDWIS lists 635 people served and 190 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
62 violations · 635 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 Duck Lake Water Association
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.