Community Water System · PWS 105300020
Skokomish
Operator location Skokomish Nation, EPA Region 10 — Tribal Water Systems - upper-third violation load (> 74 violations) with 532 EPA violations; groundwater source; 1,150 served (PWS-level, not municipal population).
- 1,150
- People served (this PWS)
- 532
- EPA violations (this PWS)
- 5
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Skokomish standing, high SDWIS violation third
532 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 1% is middle-third health share (≤ 23%). Population rank #18,245 of 29,740 among systems serving 500+.
The verdict
Skokomish sits in the upper third of the sitemap cohort by violation count (532), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,150 (mid served population (≤ 3,309)). Health-based share is 1% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #18,245 of 29,740
- Population · /systems
- #32 of 52
- Population · 10
- 532
- Total EPA violations on record
- 1%
- 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
- Native American
- Connections
- 115
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 506
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 46 | 2009 |
| Consumer Confidence Rule | Other | 19 | 2024 |
| Endothall | MR | 11 | 2008 |
| Glyphosate | MR | 11 | 2008 |
| Atrazine | MR | 11 | 2002 |
| 2,3,7,8-TCDD | MR | 11 | 2008 |
| ETHYLENE DIBROMIDE | MR | 11 | 2008 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 11 | 2008 |
| Diquat | MR | 11 | 2008 |
| Endrin | MR | 10 | 1996 |
| BHC-GAMMA | MR | 10 | 1996 |
| Methoxychlor | MR | 10 | 1996 |
| Dalapon | MR | 10 | 1996 |
| Di(2-ethylhexyl) adipate | MR | 10 | 1996 |
| Di(2-ethylhexyl) phthalate | MR | 10 | 1996 |
| Picloram | MR | 10 | 1996 |
| Dinoseb | MR | 10 | 1996 |
| Hexachlorocyclopentadiene | MR | 10 | 1996 |
| Carbofuran | MR | 10 | 1996 |
| LASSO | MR | 10 | 1996 |
| 2,4-D | MR | 10 | 1996 |
| 2,4,5-TP | MR | 10 | 1996 |
| Pentachlorophenol | MR | 10 | 1996 |
| Chlordane | MR | 10 | 1996 |
| Benzo(a)pyrene | MR | 10 | 1996 |
| HEXACHLOROBENZENE | MR | 10 | 1996 |
| Simazine | MR | 10 | 1996 |
| Toxaphene | MR | 10 | 1996 |
| Heptachlor | MR | 10 | 1996 |
| Heptachlor epoxide | MR | 10 | 1996 |
Violation Count vs. the National Corpus
Skokomish has 532 recorded EPA violations, 96% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 4% carry more. 1% of this system's own violations are health-based (5 of 532), and it ranks #18,245 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)
532 Higher than most more violations than 96% 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 Skokomish
532 violations on record for 105300020; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
532 violations · 1,150 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 Skokomish
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 10 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 10 — Tribal Water Systems 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.