Clean Water Act discharge permit · NPDES MN0046256
MINNESOTA POWER - ARROWHEAD HVDC, Hermantown, MN: NPDES MN0046256 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MINNESOTA POWER - ARROWHEAD HVDC, held by MINNESOTA POWER INC-ARROWHEAD, holds NPDES permit MN0046256, which discharges to Unnamed Cr. EPA’s file records it issued July 1, 2012 and expiring June 30, 2017. 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 | MINNESOTA POWER - ARROWHEAD HVDC |
|---|---|
| Permittee as filed | MINNESOTA POWER INC-ARROWHEAD |
| NPDES ID | MN0046256 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 1, 2012 |
| Expiration date | June 30, 2017 |
| Address | Hermantown, MN 55810 |
| Receiving water | UNNAMED CR |
| Subwatershed | Middle Midway River (HUC 040102011402) |
| Other EPA IDs (FRS) | RCRA handler MND985713882 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 5Pollutants on file
- 0Under a numeric limit
- 5With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 0 | 12 | 2 | June 30, 1992 | 1,233% over the limit |
| Zinc, total [as Zn] | 0 | 1 | 1 | June 30, 2020 | 225% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 15 | 0 | ||
| pH | 0 | 9 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 4 | 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 MN0046256.
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 MN0046256 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.