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Clean Water Act discharge permit · NPDES MNG490038

NORTHSTAR MATERIALS INC DBA KNIFE RIVER MATERIALS, Bemidji, MN: NPDES MNG490038 discharge permit, effluent exceedances, inspections, penalties

NORTHSTAR MATERIALS INC DBA KNIFE RIVER MATERIALS, held by Northstar Materials Inc dba Knife River, holds NPDES permit MNG490038. EPA’s file records it issued January 1, 2026 and expiring May 31, 2027.

NORTHSTAR MATERIALS INC DBA KNIFE RIVER MATERIALS, Bemidji, Minnesota: Coverage under a general permit MNG490038, held by Northstar Materials Inc dba Knife River; Effective; issued January 1, 2026, term to May 31, 2027, by STA.

  • pH: 8 limits, 2 violations of any kind, 2 effluent exceedances, latest September 30, 2020.
  • Solids, total suspended: 4 limits, 2 violations of any kind, 2 effluent exceedances, latest December 31, 2020, largest 143% over the limit.
  • Flow, in conduit or thru treatment plant: 8 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 4 limits, 0 violations of any kind, 0 effluent exceedances.

NORTHSTAR MATERIALS INC DBA KNIFE RIVER MATERIALS among its neighbors

EPA’s permit file holds 2 discharge permits in the Headwaters Kabekona River subwatershed (HUC 070101020201), MNG490038 among them. Its county holds 10, 1 of them major permits; MNG490038 is a minor permit.

Other permits in the Headwaters Kabekona River subwatershed (HUC 070101020201)

Identity

Facility as filedNORTHSTAR MATERIALS INC DBA KNIFE RIVER MATERIALS
Permittee as filedNorthstar Materials Inc dba Knife River
NPDES IDMNG490038
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedJanuary 1, 2026
Expiration dateMay 31, 2027
Issuing agencySTA
AddressBemidji, MN 56601
Receiving water impaired303(D) Listed
SubwatershedHeadwaters Kabekona River (HUC 070101020201)
SIC1442 – Construction Sand And Gravel
Other EPA IDs (FRS)RCRA handler MND985708429; ICIS-AIR source MN0000002711100081

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH822September 30, 2020
Solids, total suspended422December 31, 2020143% over the limit
Flow, in conduit or thru treatment plant800
Phosphorus, total [as P]400

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MNG490038.

Inspections

EPA’s inspection file holds no inspection for NPDES MNG490038.

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 MNG490038.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers Clean Water Act NPDES permit MNG490038, held by Northstar Materials Inc dba Knife River of Bemidji, MN, with a permit status of Effective and a discharger class of 4 minor discharger. The page lists 2 pollutants under a numeric limit and 2 pollutants with an effluent exceedance, with an issue date of January 1, 2026 and an expiration date of May 31, 2027.