Community Water System · PWS WA5389250
Trentwood Irrigation District 3
Operator location Spokane, Washington - UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 45 violations and 4,228 people served.
- 4,228
- People served (this PWS)
- 45
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Trentwood Irrigation District 3 standing, mid SDWIS violation third
UCMR5 detected 5 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #8,559 of 29,740 among systems serving 500+.
The verdict
Trentwood Irrigation District 3 lands in the middle third by violation volume (45), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (4,228; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 7% (middle-third health share (≤ 23%)). UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #8,559 of 29,740
- Population · /systems
- #214 of 766
- Population · WA
- 45
- Total EPA violations on record
- 7%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 2,377
- County
- Spokane
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 37
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 4 | 2024 |
| Coliform (TCR) | MR | 4 | 1992 |
| Nitrate | MR | 4 | 2025 |
| Coliform (TCR) | MCL | 3 | 1992 |
| Pentachlorophenol | MR | 2 | 2002 |
| Dalapon | MR | 1 | 2002 |
| Dinoseb | MR | 1 | 2002 |
| 2,4,5-TP | MR | 1 | 2002 |
| OXAMYL | MR | 1 | 2002 |
| Aldicarb sulfoxide | MR | 1 | 2002 |
| Carbofuran | MR | 1 | 2002 |
| Aldicarb | MR | 1 | 2002 |
| Endrin | MR | 1 | 2002 |
| Toxaphene | MR | 1 | 2002 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2002 |
| Simazine | MR | 1 | 2002 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2002 |
| LASSO | MR | 1 | 2002 |
| Heptachlor epoxide | MR | 1 | 2002 |
| HEXACHLOROBENZENE | MR | 1 | 2002 |
| Chlordane | MR | 1 | 2002 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Benzo(a)pyrene | MR | 1 | 2002 |
| Methoxychlor | MR | 1 | 2002 |
| Hexachlorocyclopentadiene | MR | 1 | 2002 |
| Heptachlor | MR | 1 | 2002 |
| Picloram | MR | 1 | 2002 |
| Revised Total Coliform Rule | MON | 1 | 2023 |
| Atrazine | MR | 1 | 2002 |
| Aldicarb sulfone | MR | 1 | 2002 |
Violation Count vs. the National Corpus
Trentwood Irrigation District 3 has 45 recorded EPA violations, 54% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 46% carry more. 7% of this system's own violations are health-based (3 of 45), and it ranks #8,559 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)
45 Around the middle fewer violations than 46% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 7 of 232 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHpS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/26/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTA | 6/26/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHxA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/26/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 6/26/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 6/26/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFBS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 6/26/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 6/26/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 6/26/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 6/26/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 6/26/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 6/26/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 6/26/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFOA | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/26/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 6/26/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/26/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
UCMR5 PFAS record for Trentwood Irrigation District 3
Open EPA SDWIS federal reports for PWS WA5389250 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
45 violations · 4,228 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Trentwood Irrigation District 3
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Washington compares on the same EPA violation measures. Washington 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.