Clean Water Act discharge permit · NPDES SD0026794
USCOE - OAHE DAM, Pierre, SD: NPDES SD0026794 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
USCOE - OAHE DAM, held by USCOE - Oahe Dam, holds NPDES permit SD0026794, which discharges to Lake Oahe (Missouri River), Lake Sharpe. EPA’s file records it issued April 1, 2017 and expiring March 31, 2022. 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 | USCOE - OAHE DAM |
|---|---|
| Permittee as filed | USCOE - Oahe Dam |
| NPDES ID | SD0026794 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Program | Publicly owned treatment works |
| Issued | April 1, 2017 |
| Expiration date | March 31, 2022 |
| Issuing agency | SDDANR |
| Address | Pierre, SD 57501 |
| Receiving water | LAKE OAHE (MISSOURI RIVER), LAKE SHARPE |
| Subwatershed | Snake Butte-Missouri River (HUC 101401010301) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler SD8210890069 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 8Pollutants on file
- 6Under a numeric limit
- 8With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| pH | 6 | 253 | 11 | March 31, 2020 | |
| Solids, total suspended | 0 | 19 | 3 | July 31, 2002 | 73% over the limit |
| Temperature, water deg. centigrade | 6 | 551 | 0 | ||
| Floating solids, waste or visible foam-visual | 3 | 117 | 0 | ||
| Oil and grease visual | 3 | 110 | 0 | ||
| Hydrocarbons, petroleum | 0 | 88 | 0 | ||
| Oil and grease, hexane extr method | 3 | 17 | 0 | ||
| Flow rate | 2 | 16 | 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 |
|---|---|---|
| August 26, 2025 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| February 21, 2025 | Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment | 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, SD0026794.
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 SD0026794 there.
Nearby on the register
- Discharge permits in Pierre
- Every permit record in Pierre, A to Z
- Discharge permits in South Dakota
- Every permit record in South Dakota, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.