Clean Water Act discharge permit · NPDES SDR10P5Y8
NORTHWESTERN ENERGY SD15 REROUTE, Clear Lake, SD: NPDES SDR10P5Y8 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
NORTHWESTERN ENERGY SD15 REROUTE, held by NorthWestern Energy, holds NPDES permit SDR10P5Y8. EPA’s file records it issued May 27, 2026 and expiring October 31, 2028. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
What the register holds for NORTHWESTERN ENERGY SD15 REROUTE: its NPDES ID, its permit type and status, its dates, its address in Clear Lake, South Dakota. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES SDR10P5Y8.
Identity
| Facility as filed | NORTHWESTERN ENERGY SD15 REROUTE |
|---|---|
| Permittee as filed | NorthWestern Energy |
| NPDES ID | SDR10P5Y8 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Construction stormwater |
| Issued | May 27, 2026 |
| Expiration date | October 31, 2028 |
| Issuing agency | SDDANR |
| Address | Clear Lake, SD 57226 |
| Subwatershed | Coteau Lakes (HUC 101702020401) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 0Pollutants on file
- 0Under a numeric limit
- 0With a violation of any kind
- 0With an effluent exceedance
EPA’s limits and effluent violation files hold no pollutant row for NPDES SDR10P5Y8.
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES SDR10P5Y8.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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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- One state — $4,990/year
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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 SDR10P5Y8 there.
Nearby on the register
- Discharge permits in Clear Lake
- Every permit record in Clear Lake, 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 September 15, 2026.