Clean Water Act discharge permit · NPDES OR0020656
SILVERTON STP, Silverton, OR: NPDES OR0020656 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
SILVERTON STP, held by SILVERTON, CITY OF, holds NPDES permit OR0020656, which discharges to Silver Creek (Rm 6.8). EPA’s file records it issued August 2, 2005 and expiring December 31, 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 | SILVERTON STP |
|---|---|
| Permittee as filed | SILVERTON, CITY OF |
| NPDES ID | OR0020656 |
| 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 | August 2, 2005 |
| Expiration date | December 31, 2009 |
| Address | Silverton, OR 97381 |
| Receiving water | SILVER CREEK (RM 6.8) |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Silver Creek (HUC 170900090104) |
| 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
- 15Pollutants on file
- 15Under a numeric limit
- 15With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 11 | 152 | 85 | August 31, 2022 | 3,002% over the limit |
| Solids, total suspended | 16 | 206 | 43 | December 31, 2023 | 351% over the limit |
| Excess thermal load | 3 | 31 | 28 | December 31, 2025 | 606% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 16 | 128 | 10 | September 30, 2014 | 5,953% over the limit |
| pH | 8 | 28 | 10 | October 31, 2021 | |
| E. coli | 8 | 27 | 5 | February 28, 2021 | 99,999% over the limit |
| Oxygen, dissolved [DO] | 3 | 14 | 5 | June 30, 2017 | 89% over the limit |
| Solids, suspended percent removal | 2 | 10 | 3 | December 31, 2023 | 42% over the limit |
| BOD, carbonaceous, percent removal | 2 | 6 | 1 | September 30, 2014 | 73% over the limit |
| Temperature, water deg. centigrade | 3 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 3 | 7 | 0 | ||
| Ultraviolet light dosage | 4 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 3 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 3 | 0 | ||
| Phosphorus, total [as P] | 2 | 3 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 1, 2021 | Pretreatment - Failure to submit required report (non-DMR) | ST6 |
| February 1, 2021 | Reporting Violations - Failure to Submit DMRs | ST6 |
| January 1, 2021 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| June 1, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| April 24, 2018 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| April 24, 2018 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| August 28, 2017 | Biosolids: Other Management Practice Violation | ST6 |
| August 28, 2017 | Management Practice Violations - Improper Land Application (non-503 non-CAFO) | ST6 |
| August 14, 2017 | Effluent Violations - Numeric effluent violation | 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 OR0020656 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.