Clean Water Act discharge permit · NPDES OR0020630
RIDDLE STP, Riddle, OR: NPDES OR0020630 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
RIDDLE STP, held by RIDDLE, CITY OF, holds NPDES permit OR0020630, which discharges to Cow Creek (Rm 2.0). EPA’s file records it issued April 25, 2005 and expiring March 31, 2010. 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 | RIDDLE STP |
|---|---|
| Permittee as filed | RIDDLE, CITY OF |
| NPDES ID | OR0020630 |
| 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 25, 2005 |
| Expiration date | March 31, 2010 |
| Address | Riddle, OR 97469 |
| Receiving water | COW CREEK (RM 2.0) |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Russell Creek-Cow Creek (HUC 171003020905) |
| 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
- 9Pollutants on file
- 0Under a numeric limit
- 9With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 0 | 9 | 9 | June 30, 2025 | 303% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 19 | 8 | January 31, 2025 | 99,999% over the limit |
| BOD, 5-day, percent removal | 0 | 6 | 4 | March 31, 2025 | 99,999% over the limit |
| Solids, total suspended | 0 | 7 | 1 | July 31, 2025 | 7% over the limit |
| Solids, suspended percent removal | 0 | 2 | 1 | January 31, 2025 | 13% over the limit |
| pH | 0 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 2 | 0 | ||
| E. coli | 0 | 2 | 0 | ||
| Temperature, water deg. centigrade | 0 | 1 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 1, 2025 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| November 7, 2022 | Management Practice Violations - Best Management Practice Deficiencies | ST6 |
| February 1, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| February 20, 2020 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, OR0020630.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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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 OR0020630 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.