Clean Water Act discharge permit · NPDES NDR320639

KNIFE RIVER - WASHBURN RMX PLANT, Washburn, ND: NPDES NDR320639 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
2Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

KNIFE RIVER - WASHBURN RMX PLANT, held by Knife River Corporation North Central, holds NPDES permit NDR320639, which discharges to Painted Woods-Square Butte. EPA’s file records it issued December 23, 2019 and expiring December 31, 2024.

KNIFE RIVER - WASHBURN RMX PLANT, Washburn, North Dakota: Coverage under a general permit NDR320639, held by Knife River Corporation North Central; Administratively continued (past its expiration date and still in force until reissued); issued December 23, 2019, term to December 31, 2024, by North Dakota Department of Environmental Quality; discharges to Painted Woods-Square Butte.

Solids, total suspended: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Iron, total [as Fe]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Other permits held by Knife River Corporation North Central

CITY OF WILLISTON: NDR109840, issued March 31, 2015
KNIFE RIVER-ROCK ISLAND FACILITY, Bismarck: NDR320047, issued December 23, 2019
KNIFE RIVER CORPORATION - NORTH CENTRAL; PORTABLE LOCATIONS STATEWIDE, Bismarck: NDR320151, issued December 23, 2019
KNIFE RIVER - BEULAH PLANT, Beulah: NDR320640, issued December 23, 2019
KNIFE RIVER WESTERN NORTH DAKOTA, Williston: NDR320659, issued December 23, 2019
KNIFE RIVER - WATFORD CITY RMX, Watford City: NDR320695, issued December 23, 2019
KNIFE RIVER TIOGA FACILITY, Tioga: NDR320706, issued December 23, 2019

KNIFE RIVER - WASHBURN RMX PLANT among its neighbors

EPA’s permit file holds 4 discharge permits in the Lewis and Clark Game Management Area-Missouri River subwatershed (HUC 101301010705), NDR320639 among them. Its county holds 69, 0 of them major permits; NDR320639 is a minor permit.

Other permits in the Lewis and Clark Game Management Area-Missouri River subwatershed (HUC 101301010705)

NORTH DAKOTA 4H CAMP, Washburn: NDG124902, minor permit, discharging to Painted Woods-Square Butte, permit term to September 30, 2023
WASHBURN CITY OF, Washburn: NDG123167, minor permit, discharging to Painted Woods-Square Butte, permit term to September 30, 2023
WASHBURN WTP, Washburn: NDG525631, minor permit, discharging to Painted Woods-Square Butte, permit term to March 31, 2024

What the register holds for KNIFE RIVER - WASHBURN RMX PLANT: its NPDES ID, its permit type and status, its dates, its address in Washburn, North Dakota, its receiving water, and 2 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES NDR320639.

Identity

Facility as filed	KNIFE RIVER - WASHBURN RMX PLANT
Permittee as filed	Knife River Corporation North Central
NPDES ID	NDR320639
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	December 23, 2019
Expiration date	December 31, 2024
Issuing agency	North Dakota Department of Environmental Quality
Address	Washburn, ND 58577
Receiving water	Painted Woods-Square Butte
Subwatershed	Lewis and Clark Game Management Area-Missouri River (HUC 101301010705)

Effluent limits and exceedances

2Pollutants on file
2Under a numeric limit
0With a violation of any kind
0With 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	1	0	0
Iron, total [as Fe]	1	0	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES NDR320639.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES NDR320639.

Inspections

EPA’s inspection file holds no inspection for NPDES NDR320639.

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 NDR320639.

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, NDR320639.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers Clean Water Act discharge permit NPDES NDR320639 for KNIFE RIVER - WASHBURN RMX PLANT in Washburn, ND, held by Knife River Corporation North Central, which discharges to Painted Woods-Square Butte. The permit is listed as administratively continued, with 2 pollutants under a numeric limit and 0 pollutants with an effluent exceedance.