Community Water System · PWS 105300008
Omak HUD
Operator location Nespelem, EPA Region 10 — Tribal Water Systems - smaller served population (≤ 999) at 380 people served; 529 SDWIS violations on record from groundwater sources.
- 380
- People served (this PWS)
- 529
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Omak HUD standing, high SDWIS violation third
380 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 1% is middle-third health share (≤ 23%).
The verdict
Omak HUD sits in the upper third of the sitemap cohort by violation count (529), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (380; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 1% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 529
- Total EPA violations on record
- 1%
- Health-based (MCL / treatment failure)
- 380
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
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
- 109
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 498
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 19 | 2023 |
| Consumer Confidence Rule | Other | 19 | 2025 |
| Gross Alpha, Excl. Radon and U | MR | 18 | 2014 |
| Atrazine | MR | 12 | 2017 |
| Benzene | MR | 11 | 2017 |
| Antimony, Total | MR | 10 | 2017 |
| Coliform (TCR) | MR | 9 | 2012 |
| Combined Radium (-226 and -228) | MR | 9 | 2014 |
| Combined Uranium | MR | 8 | 2014 |
| Di(2-ethylhexyl) phthalate | MR | 8 | 2017 |
| Endrin | MR | 7 | 2017 |
| BHC-GAMMA | MR | 7 | 2017 |
| Methoxychlor | MR | 7 | 2017 |
| Toxaphene | MR | 7 | 2017 |
| Di(2-ethylhexyl) adipate | MR | 7 | 2017 |
| Simazine | MR | 7 | 2017 |
| Hexachlorocyclopentadiene | MR | 7 | 2017 |
| LASSO | MR | 7 | 2017 |
| Heptachlor epoxide | MR | 7 | 2017 |
| Chlordane | MR | 7 | 2017 |
| Benzo(a)pyrene | MR | 7 | 2017 |
| Chlorine | MR | 7 | 2023 |
| HEXACHLOROBENZENE | MR | 7 | 2017 |
| Heptachlor | MR | 7 | 2017 |
| Picloram | MR | 7 | 2017 |
| Arsenic | MR | 6 | 2017 |
| Barium | MR | 6 | 2017 |
| Cadmium | MR | 6 | 2017 |
| Mercury | MR | 6 | 2017 |
| Fluoride | MR | 6 | 2017 |
Violation Count vs. the National Corpus
Omak HUD has 529 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 (7 of 529), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
529 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
Population served record for Omak HUD
EPA SDWIS lists 380 people served and 109 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
529 violations · 380 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.
What to do with Omak HUD
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.