Community Water System · PWS WA5311850
Cathlamet Water Dept
Operator location Cathlamet, Washington - upper-third violation load (> 74 violations) with 498 EPA violations; surface water source; 1,636 served (PWS-level, not municipal population).
- 1,636
- People served (this PWS)
- 498
- EPA violations (this PWS)
- 60
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Cathlamet Water Dept standing, high SDWIS violation third
498 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 12% is middle-third health share (≤ 23%). Population rank #15,174 of 29,740 among systems serving 500+.
The verdict
Cathlamet Water Dept sits in the upper third of the sitemap cohort by violation count (498), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,636 (mid served population (≤ 3,309)). Health-based share is 12% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #15,174 of 29,740
- Population · /systems
- #399 of 766
- Population · WA
- 498
- Total EPA violations on record
- 12%
- 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
- 739
- County
- Wahkiakum
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 430
- Treatment Tech Violations
- 60
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 60 | 1999 |
| Arsenic | MR | 13 | 2008 |
| Mercury | MR | 13 | 2008 |
| Selenium | MR | 13 | 2008 |
| Barium | MR | 13 | 2008 |
| Chromium | MR | 13 | 2008 |
| Cadmium | MR | 13 | 2008 |
| Fluoride | MR | 13 | 2008 |
| Nickel | MR | 12 | 2008 |
| CYANIDE | MR | 12 | 2008 |
| Antimony, Total | MR | 12 | 2008 |
| Beryllium, Total | MR | 12 | 2008 |
| Thallium, Total | MR | 12 | 2008 |
| cis-1,2-Dichloroethylene | MR | 11 | 2008 |
| o-Dichlorobenzene | MR | 11 | 2008 |
| Vinyl chloride | MR | 11 | 2008 |
| 1,1-Dichloroethylene | MR | 11 | 2008 |
| 1,1,1-Trichloroethane | MR | 11 | 2008 |
| 1,1,2-Trichloroethane | MR | 11 | 2008 |
| CHLOROBENZENE | MR | 11 | 2008 |
| Toluene | MR | 11 | 2008 |
| Ethylbenzene | MR | 11 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 11 | 2008 |
| DICHLOROMETHANE | MR | 11 | 2008 |
| p-Dichlorobenzene | MR | 11 | 2008 |
| trans-1,2-Dichloroethylene | MR | 11 | 2008 |
| Carbon tetrachloride | MR | 11 | 2008 |
| 1,2-Dichloropropane | MR | 11 | 2008 |
| Trichloroethylene | MR | 11 | 2008 |
| Tetrachloroethylene | MR | 11 | 2008 |
Violation Count vs. the National Corpus
Cathlamet Water Dept has 498 recorded EPA violations, 95% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 5% carry more. 12% of this system's own violations are health-based (60 of 498), and it ranks #15,174 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)
498 Higher than most more violations than 95% 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
SDWIS compliance record for Cathlamet Water Dept
498 violations on record for WA5311850; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
498 violations · 1,636 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Cathlamet Water Dept
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.