Transient Non-Community Water System · PWS 105338120
Lyle Tfas
Operator location Portland, EPA Region 10 — Tribal Water Systems - smaller served population (≤ 999) at 33 people served; 19 SDWIS violations on record from groundwater sources.
- 33
- People served (this PWS)
- 19
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Lyle Tfas standing, low SDWIS violation third
33 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%).
The verdict
Lyle Tfas is in the lower third by violation count (19; 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 (33; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 19
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
- 33
- 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
- 10
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 17
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 14 | 2019 |
| Chlorine | MR | 2 | 2019 |
| Nitrate | MR | 1 | 2017 |
| Revised Total Coliform Rule | RPT | 1 | 2023 |
| Groundwater Rule | TT | 1 | 2018 |
Violation Count vs. the National Corpus
Lyle Tfas has 19 recorded EPA violations, 30% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 69% carry more. 5% of this system's own violations are health-based (1 of 19), 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)
19 Lower than most fewer violations than 69% 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 Lyle Tfas
EPA SDWIS lists 33 people served and 10 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
19 violations · 33 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.
What to do with Lyle Tfas
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.