Community Water System · PWS WA5335500
Ilwaco Water Department City Of
Operator location Ilwaco, Washington - upper-third violation load (> 74 violations) with 159 EPA violations; surface water source; 2,757 served (PWS-level, not municipal population).
- 2,757
- People served (this PWS)
- 159
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Ilwaco Water Department City Of standing, high SDWIS violation third
159 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 4% is middle-third health share (≤ 23%). Population rank #11,222 of 29,740 among systems serving 500+.
The verdict
Ilwaco Water Department City Of sits in the upper third of the sitemap cohort by violation count (159), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,757 (mid served population (≤ 3,309)). Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #11,222 of 29,740
- Population · /systems
- #286 of 766
- Population · WA
- 159
- Total EPA violations on record
- 4%
- 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
- 703
- County
- Pacific
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 152
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 12 | 2007 |
| Lead and Copper Rule | MR | 11 | 2009 |
| Arsenic | MR | 8 | 2007 |
| Barium | MR | 8 | 2007 |
| Cadmium | MR | 8 | 2007 |
| Chromium | MR | 8 | 2007 |
| CYANIDE | MR | 8 | 2007 |
| Fluoride | MR | 8 | 2007 |
| Mercury | MR | 8 | 2007 |
| Beryllium, Total | MR | 8 | 2007 |
| Coliform (TCR) | MR | 8 | 1998 |
| Selenium | MR | 8 | 2007 |
| Nickel | MR | 8 | 2007 |
| Thallium, Total | MR | 8 | 2007 |
| Antimony, Total | MR | 8 | 2007 |
| Surface Water Treatment Rule | TT | 6 | 2005 |
| TTHM | MR | 2 | 2015 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2015 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2007 |
| o-Dichlorobenzene | MR | 1 | 2007 |
| p-Dichlorobenzene | MR | 1 | 2007 |
| Vinyl chloride | MR | 1 | 2007 |
| Carbon tetrachloride | MR | 1 | 2007 |
| Trichloroethylene | MR | 1 | 2007 |
| 1,1,2-Trichloroethane | MR | 1 | 2007 |
| Tetrachloroethylene | MR | 1 | 2007 |
| Benzene | MR | 1 | 2007 |
| Styrene | MR | 1 | 2007 |
| Consumer Confidence Rule | Other | 1 | 2016 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
Violation Count vs. the National Corpus
Ilwaco Water Department City Of has 159 recorded EPA violations, 82% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 18% carry more. 4% of this system's own violations are health-based (6 of 159), and it ranks #11,222 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)
159 Higher than most more violations than 82% 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 Ilwaco Water Department City Of
159 violations on record for WA5335500; 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
159 violations · 2,757 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 Ilwaco Water Department 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.