Community Water System · PWS WA5315550
Coupeville Town Of
Operator location Coupeville, Washington - 0% of 104 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 4,077 served per SDWIS.
- 4,077
- People served (this PWS)
- 104
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- 7 PFAS
- UCMR5 (this PWS)
Coupeville Town Of standing, high SDWIS violation third
0% of 104 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #8,747 of 29,740 among systems serving 500+.
The verdict
Coupeville Town Of sits in the upper third of the sitemap cohort by violation count (104), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (4,077; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is only 0% - almost all of this trail is monitoring or reporting. UCMR5 detected 7 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #8,747 of 29,740
- Population · /systems
- #219 of 766
- Population · WA
- 104
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,478
- County
- Island
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 94
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 11 | 2007 |
| Nitrate | MR | 10 | 2009 |
| Barium | MR | 4 | 2002 |
| Cadmium | MR | 4 | 2002 |
| Chromium | MR | 4 | 2002 |
| Mercury | MR | 4 | 2002 |
| Fluoride | MR | 4 | 2002 |
| Selenium | MR | 4 | 2002 |
| Antimony, Total | MR | 3 | 2002 |
| Beryllium, Total | MR | 3 | 2002 |
| Thallium, Total | MR | 3 | 2002 |
| CYANIDE | MR | 3 | 2002 |
| Nickel | MR | 3 | 2002 |
| Consumer Confidence Rule | Other | 2 | 2015 |
| Aldicarb sulfone | MR | 2 | 2008 |
| OXAMYL | MR | 2 | 2008 |
| Aldicarb | MR | 2 | 2008 |
| Carbofuran | MR | 2 | 2008 |
| Aldicarb sulfoxide | MR | 2 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2002 |
| cis-1,2-Dichloroethylene | MR | 1 | 2002 |
| o-Dichlorobenzene | MR | 1 | 2002 |
| p-Dichlorobenzene | MR | 1 | 2002 |
| trans-1,2-Dichloroethylene | MR | 1 | 2002 |
| 1,2-Dichloroethane | MR | 1 | 2002 |
| Trichloroethylene | MR | 1 | 2002 |
| Tetrachloroethylene | MR | 1 | 2002 |
| CHLOROBENZENE | MR | 1 | 2002 |
| Benzene | MR | 1 | 2002 |
| Toluene | MR | 1 | 2002 |
Violation Count vs. the National Corpus
Coupeville Town Of has 104 recorded EPA violations, 74% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 26% carry more. 0% of this system's own violations are health-based (0 of 104), and it ranks #8,747 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)
104 Around the middle fewer violations than 26% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 9 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| ADONA | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/20/2025 | 3.30 ppt | 3.00 ppt | Detected |
| PFTA | 8/20/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFOA | 8/20/2025 | 9.80 ppt | 4.00 ppt | Detected |
| PFDA | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 8/20/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFDoA | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/20/2025 | 17.00 ppt | 3.00 ppt | Detected |
| PFUnA | 8/20/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/20/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBS | 8/20/2025 | 6.70 ppt | 3.00 ppt | Detected |
| HFPO-DA | 8/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/20/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHxS | 8/20/2025 | 3.80 ppt | 3.00 ppt | Detected |
| PFNA | 8/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 8/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 8/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/20/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 8/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/20/2025 | 12.00 ppt | 3.00 ppt | Detected |
| PFMPA | 8/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeS | 8/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 3/10/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 3/10/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 3/10/2025 | 5.30 ppt | 5.00 ppt | Detected |
| HFPO-DA | 3/10/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 3/10/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 3/10/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 3/10/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 3/10/2025 | 5.90 ppt | 3.00 ppt | Detected |
| PFDoA | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 3/10/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 3/10/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 3/10/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 3/10/2025 | 11.00 ppt | 3.00 ppt | Detected |
| PFMPA | 3/10/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 3/10/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 3/10/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
Health-based violations on Coupeville Town Of
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WA5315550.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
104 violations · 4,077 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 Coupeville 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.