Clean Water Act discharge permit · NPDES OR0020885
THE DALLES STP, The Dalles, OR: NPDES OR0020885 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 12Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
THE DALLES STP, held by THE DALLES, CITY OF, holds NPDES permit OR0020885, which discharges to Columbia River (Rm 189.5). EPA’s file records it issued December 28, 2018 and expiring November 30, 2023. 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 | THE DALLES STP |
|---|---|
| Permittee as filed | THE DALLES, CITY OF |
| NPDES ID | OR0020885 |
| 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 | December 28, 2018 |
| Expiration date | November 30, 2023 |
| Address | The Dalles, OR 97058 |
| Receiving water | COLUMBIA RIVER (RM 189.5) |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Murdock-Columbia River (HUC 170701050406) |
| 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
- 12Pollutants on file
- 12Under a numeric limit
- 6With a violation of any kind
- 4With 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 | 52 | 13 | October 31, 2025 | 99,999% over the limit |
| Solids, total suspended | 11 | 114 | 3 | May 31, 2018 | 70% over the limit |
| BOD, 5-day, 20 deg. C | 11 | 113 | 3 | May 31, 2018 | 50% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | May 31, 2018 | 7% over the limit |
| pH | 4 | 2 | 0 | ||
| Ultraviolet light dosage | 2 | 1 | 0 | ||
| Ultraviolet light intensity | 4 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| Ultraviolet light transmittance | 4 | 0 | 0 | ||
| Report due [yrmoda] | 3 | 0 | 0 | ||
| Temperature, water deg. centigrade | 2 | 0 | 0 | ||
| BOD, 5-day, percent removal | 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
- 12Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 1, 2025 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| May 1, 2023 | WW SSO - Discharge to Waters | ST6 |
| September 23, 2022 | WW SSO - Discharge to Waters | ST6 |
| January 1, 2022 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| January 1, 2022 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| May 14, 2021 | WW SSO - Discharge to Waters | ST6 |
| February 2, 2021 | WW SSO - Discharge to Waters | ST6 |
| December 18, 2020 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| December 17, 2020 | WW SSO - Discharge to Waters | ST6 |
| July 13, 2020 | WW SSO - Discharge to Waters | ST6 |
| July 12, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| May 1, 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, OR0020885.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 OR0020885 there.
Nearby on the register
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- Every permit record in The Dalles, A to Z
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- Every permit record in Oregon, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.