Community Water System · PWS 105300014
Nisqually-Leschi & West Nisqually
Operator location Olympia, EPA Region 10 — Tribal Water Systems - upper-third violation load (> 74 violations) with 694 EPA violations; groundwater source; 3,200 served (PWS-level, not municipal population).
- 3,200
- People served (this PWS) Middle third of systems
- 694
- EPA violations (this PWS) Upper third of systems
- 4
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Nisqually-Leschi & West Nisqually standing, high SDWIS violation third
694 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 #10,142 of 29,740 among systems serving 500+.
The verdict
Nisqually-Leschi & West Nisqually sits in the upper third of the sitemap cohort by violation count (694), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 3,200 (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.
- #10,142 of 29,740
- Population · /systems
- #9 of 52
- Population · 10
- 694
- 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.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 84
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 669
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 61 | 2015 |
| Nitrate | MR | 19 | 2023 |
| Endothall | MR | 13 | 2016 |
| Gross Alpha, Excl. Radon and U | MR | 13 | 2020 |
| Chlorine | MR | 13 | 2024 |
| Glyphosate | MR | 13 | 2016 |
| Consumer Confidence Rule | Other | 13 | 2015 |
| 2,3,7,8-TCDD | MR | 12 | 2016 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 12 | 2016 |
| Methoxychlor | MR | 11 | 2016 |
| Toxaphene | MR | 11 | 2016 |
| Simazine | MR | 11 | 2016 |
| Atrazine | MR | 11 | 2016 |
| LASSO | MR | 11 | 2016 |
| Heptachlor | MR | 11 | 2016 |
| Total Polychlorinated Biphenyls (PCB) | MR | 11 | 2016 |
| ETHYLENE DIBROMIDE | MR | 11 | 2016 |
| BHC-GAMMA | MR | 11 | 2016 |
| Hexachlorocyclopentadiene | MR | 11 | 2016 |
| Benzo(a)pyrene | MR | 11 | 2016 |
| Di(2-ethylhexyl) adipate | MR | 11 | 2016 |
| HEXACHLOROBENZENE | MR | 11 | 2016 |
| Endrin | MR | 11 | 2016 |
| Chlordane | MR | 11 | 2016 |
| Diquat | MR | 11 | 2016 |
| Picloram | MR | 10 | 2016 |
| 2,4-D | MR | 10 | 2016 |
| Pentachlorophenol | MR | 10 | 2016 |
| Combined Radium (-226 and -228) | MR | 10 | 2020 |
| Dalapon | MR | 10 | 2016 |
Violation Count vs. the National Corpus
Nisqually-Leschi & West Nisqually has 694 recorded EPA violations, 98% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 2% carry more. 1% of this system's own violations are health-based (4 of 694), and it ranks #10,142 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)
694 Higher than most more violations than 98% 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
How many violations vs. how serious, among peer systems
Nisqually-Leschi & West Nisqually plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
SDWIS compliance record for Nisqually-Leschi & West Nisqually
694 violations on record for 105300014; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
694 violations · 3,200 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 Nisqually-Leschi & West Nisqually
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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.