Clean Water Act discharge permit · NPDES MN0001007
MINNESOTA POWER - BOSWELL ENERGY CENTER, Cohasset, MN: NPDES MN0001007 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 34Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
MINNESOTA POWER - BOSWELL ENERGY CENTER, held by Minnesota Power, holds NPDES permit MN0001007. EPA’s file records it issued April 1, 2025 and expiring January 31, 2030. 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 | MINNESOTA POWER - BOSWELL ENERGY CENTER |
|---|---|
| Permittee as filed | Minnesota Power |
| NPDES ID | MN0001007 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | April 1, 2025 |
| Expiration date | January 31, 2030 |
| Issuing agency | STA |
| Address | Cohasset, MN 55721 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Mississippi River (HUC 070101010909) |
| Other EPA IDs (FRS) | RCRA handler MND076494616; ICIS-AIR source MN0000002706100004 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 38Pollutants on file
- 34Under a numeric limit
- 14With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 23 | 15 | July 31, 2008 | 460% over the limit |
| Oil and grease, hexane extr method | 4 | 336 | 8 | December 31, 2020 | 793% over the limit |
| Copper, total [as Cu] | 2 | 14 | 8 | March 31, 2026 | 2,044% over the limit |
| Chlorine, total residual | 2 | 8 | 6 | June 30, 2026 | 2,532% over the limit |
| Mercury, total [as Hg] | 2 | 6 | 2 | February 28, 2021 | 46% over the limit |
| pH | 6 | 5 | 1 | May 31, 2020 | |
| Sulfate, total [as SO4] | 4 | 4 | 1 | June 30, 2005 | 515% over the limit |
| Flow, in conduit or thru treatment plant | 5 | 75 | 0 | ||
| Temperature, water deg. fahrenheit | 1 | 12 | 0 | ||
| Cycles Of Concentration | 0 | 8 | 0 | ||
| Chlorination | 1 | 2 | 0 | ||
| Temp. diff. between samp. & upstrm deg. F | 0 | 2 | 0 | ||
| Plant capacity fact. percent of capacity | 0 | 1 | 0 | ||
| Chlorine rate | 0 | 1 | 0 | ||
| Specific conductance | 5 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 0 | 0 | ||
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | 3 | 0 | 0 | ||
| Solids, total dissolved | 3 | 0 | 0 | ||
| Bicarbonate ion- [as HCO3] | 2 | 0 | 0 | ||
| Nitrogen, total [as N] | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Calcium, dissolved [as Ca] | 2 | 0 | 0 | ||
| Magnesium, dissolved [as Mg] | 2 | 0 | 0 | ||
| Sodium, total [as Na] | 2 | 0 | 0 | ||
| Potassium, dissolved [as K] | 2 | 0 | 0 | ||
| Chloride [as Cl] | 2 | 0 | 0 | ||
| Sulfate, dissolved [as SO4] | 2 | 0 | 0 | ||
| Fluoride, total [as F] | 2 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 2 | 0 | 0 | ||
| Manganese, dissolved [as Mn] | 2 | 0 | 0 | ||
| Magnesium, total [as Mg] | 1 | 0 | 0 | ||
| Arsenic, total [as As] | 1 | 0 | 0 | ||
| Boron, total [as B] | 1 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 1 | 0 | 0 | ||
| Lead, total [as Pb] | 1 | 0 | 0 | ||
| Manganese, total [as Mn] | 1 | 0 | 0 | ||
| Lithium, total [as Li] | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MN0001007.
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
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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 MN0001007 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.