Clean Water Act discharge permit · NPDES OR0028045
MOSIER STP, Mosier, OR: NPDES OR0028045 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
MOSIER STP, held by MOSIER, CITY OF, holds NPDES permit OR0028045, which discharges to Columbia River (Rm 174.5). EPA’s file records it issued April 4, 2013 and expiring December 31, 2017. 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 | MOSIER STP |
|---|---|
| Permittee as filed | MOSIER, CITY OF |
| NPDES ID | OR0028045 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | April 4, 2013 |
| Expiration date | December 31, 2017 |
| Address | Mosier, OR 97040 |
| Receiving water | COLUMBIA RIVER (RM 174.5) |
| Subwatershed | Rowena Creek-Columbia River (HUC 170701051105) |
| 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
- 13Pollutants on file
- 13Under a numeric limit
- 5With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 11 | 14 | 5 | April 30, 2023 | 99,999% over the limit |
| E. coli | 4 | 15 | 4 | November 30, 2024 | 496% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | July 31, 2024 | 73% over the limit |
| Solids, total suspended | 11 | 10 | 0 | ||
| BOD, 5-day, percent removal | 1 | 1 | 0 | ||
| pH | 6 | 0 | 0 | ||
| Temperature, water deg. centigrade | 3 | 0 | 0 | ||
| Turbidity | 2 | 0 | 0 | ||
| Alkalinity, total [as CaCO3] | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 1 | 0 | 0 | ||
| Ultraviolet light transmittance | 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
- 8Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 16, 2024 | Management Practice Violations - Failure to Maintain Records | ST6 |
| September 16, 2024 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| September 16, 2024 | Management Practice Violations - Failure to Develop/Enforce Standards | ST6 |
| April 1, 2024 | Monitoring Violations - No Flow Measurement Device | ST6 |
| April 1, 2023 | Management Practice Violations - Best Management Practice Deficiencies | ST6 |
| February 1, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| November 1, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 1, 2019 | Reporting Violations - Improper/ Incorrect Reporting | 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 OR0028045 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.