Clean Water Act discharge permit · NPDES MNG490003

KNIFE RIVER CENTRAL MINNESOTA, Sauk Rapids, MN: NPDES MNG490003 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
4Pollutants under a numeric limit
1Pollutants with an effluent exceedance

KNIFE RIVER CENTRAL MINNESOTA, held by Knife River Corporation, holds NPDES permit MNG490003. EPA’s file records it issued March 1, 2026 and expiring May 31, 2027. 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	KNIFE RIVER CENTRAL MINNESOTA
Permittee as filed	Knife River Corporation
NPDES ID	MNG490003
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	March 1, 2026
Expiration date	May 31, 2027
Issuing agency	STA
Address	Sauk Rapids, MN 56379
Receiving water impaired	303(D) Listed
Subwatershed	Little Elk River (HUC 070101040704)
SIC	1442 – Construction Sand And Gravel
Other EPA IDs (FRS)	RCRA handler MND047258306; ICIS-AIR source MN0000002700900035

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

4Pollutants on file
4Under a numeric limit
1With a violation of any kind
1With 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	8	4	4	September 30, 2024	340% over the limit
pH	16	0	0
Flow, in conduit or thru treatment plant	16	0	0
Phosphorus, total [as P]	8	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 MNG490003.

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 MNG490003 there.

Nearby on the register

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

This public-records page covers NPDES permit MNG490003 for KNIFE RIVER CENTRAL MINNESOTA in Sauk Rapids, MN, held by Knife River Corporation, with the permit status listed as Effective and the discharger class as Minor. The page reports 4 as the discharger class figure, 1 pollutant under a numeric limit, and 1 pollutant with an effluent exceedance, with the permit issued March 1, 2026 and expiring May 31, 2027, as of October 14, 2026.