Community Water System · PWS 105300026
White Swan
Operator location Toppenish, EPA Region 10 — Tribal Water Systems - smaller served population (≤ 999) at 900 people served; 647 SDWIS violations on record from groundwater sources.
- 900
- People served (this PWS)
- 647
- EPA violations (this PWS)
- 51
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
White Swan standing, high SDWIS violation third
900 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 8% is middle-third health share (≤ 23%). Population rank #20,944 of 29,740 among systems serving 500+.
The verdict
White Swan sits in the upper third of the sitemap cohort by violation count (647), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (900; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 8% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #20,944 of 29,740
- Population · /systems
- #39 of 52
- Population · 10
- 647
- Total EPA violations on record
- 8%
- 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
- 243
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 574
- Treatment Tech Violations
- 49
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Groundwater Rule | TT | 49 | 2021 |
| Di(2-ethylhexyl) phthalate | MR | 28 | 2019 |
| Coliform (TCR) | MR | 14 | 2011 |
| Atrazine | MR | 12 | 2018 |
| Thallium, Total | MR | 12 | 2014 |
| Nitrate | MR | 12 | 2017 |
| 2,3,7,8-TCDD | MR | 11 | 2018 |
| Consumer Confidence Rule | Other | 11 | 2019 |
| Chlordane | MR | 10 | 2018 |
| ETHYLENE DIBROMIDE | MR | 9 | 2018 |
| Pentachlorophenol | MR | 9 | 2018 |
| Benzo(a)pyrene | MR | 9 | 2018 |
| 2,4,5-TP | MR | 9 | 2018 |
| Hexachlorocyclopentadiene | MR | 9 | 2018 |
| Dinoseb | MR | 9 | 2018 |
| Simazine | MR | 9 | 2018 |
| OXAMYL | MR | 9 | 2018 |
| Glyphosate | MR | 9 | 2018 |
| Diquat | MR | 9 | 2018 |
| Dalapon | MR | 9 | 2018 |
| Methoxychlor | MR | 9 | 2018 |
| BHC-GAMMA | MR | 9 | 2018 |
| Endrin | MR | 9 | 2018 |
| Toxaphene | MR | 9 | 2018 |
| Endothall | MR | 9 | 2018 |
| Carbofuran | MR | 9 | 2018 |
| LASSO | MR | 9 | 2018 |
| HEXACHLOROBENZENE | MR | 9 | 2018 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 9 | 2018 |
| Heptachlor epoxide | MR | 9 | 2018 |
Violation Count vs. the National Corpus
White Swan has 647 recorded EPA violations, 97% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 3% carry more. 8% of this system's own violations are health-based (51 of 647), and it ranks #20,944 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)
647 Higher than most more violations than 97% 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 White Swan
EPA SDWIS lists 900 people served and 243 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
647 violations · 900 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 smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with White Swan
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.