Clean Water Act discharge permit · NPDES MN0004006
XCEL ENERGY - PRAIRIE ISLAND NUCLEAR, Welch, MN: NPDES MN0004006 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 10Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
XCEL ENERGY - PRAIRIE ISLAND NUCLEAR, held by Xcel Energy - Prairie Island Nuclear Plant, holds NPDES permit MN0004006, which discharges to Miss R. EPA’s file records it issued July 1, 2015 and expiring June 30, 2020. 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.
Identity
| Facility as filed | XCEL ENERGY - PRAIRIE ISLAND NUCLEAR |
|---|---|
| Permittee as filed | Xcel Energy - Prairie Island Nuclear Plant |
| NPDES ID | MN0004006 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 1, 2015 |
| Expiration date | June 30, 2020 |
| Issuing agency | MPCA |
| Address | Welch, MN 55089 |
| Receiving water | MISS R |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lock and Dam No. 3-Mississippi River (HUC 070400010102) |
| Other EPA IDs (FRS) | RCRA handler MND049537780; ICIS-AIR source MN0000002704900030 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 11Pollutants on file
- 10Under a numeric limit
- 11With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 10 | 12 | 5 | June 30, 2021 | 85% over the limit |
| Solids, total suspended | 0 | 2 | 2 | April 30, 2010 | 35% over the limit |
| Oxidants, total residual | 1 | 2 | 1 | May 31, 2023 | 100% over the limit |
| Temperature, water deg. fahrenheit | 5 | 5 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Temp. diff. between samp. & upstrm deg. F | 1 | 1 | 0 | ||
| Plant capacity fact. percent of capacity | 1 | 1 | 0 | ||
| Chlorine produced oxidants | 1 | 1 | 0 | ||
| Oxidants, free available | 1 | 1 | 0 | ||
| Oxidants released, total residual | 1 | 1 | 0 | ||
| Chlorine rate | 1 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MN0004006.
Inspections
EPA’s inspection file holds no inspection for NPDES MN0004006.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES MN0004006.
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, MN0004006.
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 MN0004006 there.
Nearby on the register
- Discharge permits in Welch
- Every permit record in Welch, A to Z
- Discharge permits in Minnesota
- Every permit record in Minnesota, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.