Clean Water Act discharge permit · NPDES OR0026891
TRYON CREEK WWTP, Portland, OR: NPDES OR0026891 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 14Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
TRYON CREEK WWTP, held by PORTLAND, CITY OF, holds NPDES permit OR0026891, which discharges to Willamette River. EPA’s file records it issued October 20, 2004 and expiring September 30, 2009. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | TRYON CREEK WWTP |
|---|---|
| Permittee as filed | PORTLAND, CITY OF |
| NPDES ID | OR0026891 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 20, 2004 |
| Expiration date | September 30, 2009 |
| Address | Portland, OR 97034 |
| Receiving water | WILLAMETTE RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Oswego Creek-Willamette River (HUC 170900120104) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 14Pollutants on file
- 14Under a numeric limit
- 8With a violation of any kind
- 5With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| E. coli | 4 | 5 | 5 | June 30, 2026 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 17 | 155 | 3 | September 30, 2021 | 10% over the limit |
| Solids, suspended percent removal | 1 | 3 | 2 | April 30, 2023 | 60% over the limit |
| Solids, total suspended | 17 | 153 | 1 | December 31, 2014 | 28% over the limit |
| pH | 4 | 1 | 1 | November 30, 2014 | |
| Temperature, water deg. centigrade | 1 | 152 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| BOD, 5-day, percent removal | 1 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Report due [yrmoda] | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Phosphorus, total [as P] | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 25, 2023 | Permit Violations - Unapproved Operation | ST6 |
| June 14, 2023 | Violation of an Effluent Limit | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID OR0026891 there.
Nearby on the register
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- Every permit record in Oregon, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.