Transient Non-Community Water System · PWS OR4195363
Usfws Tualatin River Natl Wlr
Operator location Sherwood, Oregon - smaller served population (≤ 999) at 275 people served; 18 SDWIS violations on record from groundwater sources.
- 275
- People served (this PWS)
- 18
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Usfws Tualatin River Natl Wlr standing, low SDWIS violation third
275 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 6% is middle-third health share (≤ 23%).
The verdict
Usfws Tualatin River Natl Wlr is in the lower third by violation count (18; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is smaller (275; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 6% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 18
- Total EPA violations on record
- 6%
- Health-based (MCL / treatment failure)
- 275
- 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
- Transient Non-Community
- Owner Type
- Federal
- Connections
- 1
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 16
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 6 | 2022 |
| Coliform (TCR) | MR | 5 | 2014 |
| Nitrate | MR | 5 | 2019 |
| Coliform (TCR) | MCL | 1 | 2008 |
Violation Count vs. the National Corpus
Usfws Tualatin River Natl Wlr has 18 recorded EPA violations, 29% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 70% carry more. 6% of this system's own violations are health-based (1 of 18), 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)
18 Lower than most fewer violations than 70% 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 Usfws Tualatin River Natl Wlr
EPA SDWIS lists 275 people served and 1 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
18 violations · 275 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
- Cheyenne Arapaho Concho EPA Region 6 — Tribal Water Systems 18violations
- Assiniboine & Sioux Rural Water System EPA Region 8 — Tribal Water Systems 18violations
- Poplar, City Of EPA Region 8 — Tribal Water Systems 18violations
- Torreon-Ojo Encino East - NTUA EPA Region 9 — Tribal Water Systems 18violations
What to do with Usfws Tualatin River Natl Wlr
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oregon compares on the same EPA violation measures. Oregon 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.