Clean Water Act discharge permit · NPDES MTG770141

ROCKY BOY'S/NCMRWS CORE PIPELINE SEGMENT #3B&4, Rudyard, MT: NPDES MTG770141 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
4Pollutants under a numeric limit
0Pollutants with an effluent exceedance

ROCKY BOY'S/NCMRWS CORE PIPELINE SEGMENT #3B&4, held by CHIPPEWA CREE CONSTRUCTION CORPORATION, holds NPDES permit MTG770141, which discharges to Marias River. EPA’s file records it issued September 24, 2025 and expiring December 31, 2025. 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	ROCKY BOY'S/NCMRWS CORE PIPELINE SEGMENT #3B&4
Permittee as filed	CHIPPEWA CREE CONSTRUCTION CORPORATION
NPDES ID	MTG770141
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	September 24, 2025
Expiration date	December 31, 2025
Address	Rudyard, MT 59540
Receiving water	Marias River
Subwatershed	Lower East Fork Black Coulee (HUC 100302031906)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

4Pollutants on file
4Under a numeric limit
4With 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
Flow rate	2	14
pH	2	14
Chlorine, total residual	2	14
Solids, total suspended	1	7

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTG770141.

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 MTG770141.

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

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, MTG770141.

Start the watch

How we handle your data → Privacy

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 MTG770141 there.

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 MTG770141 for the Rocky Boy's/NCMRWS Core Pipeline Segment #3B&4 in Rudyard, MT, held by Chippewa Cree Construction Corporation and discharging to the Marias River. The page lists a permit status of administratively continued, a Minor Discharger class 4, 0 pollutants under a numeric limit, and 0 pollutants with an effluent exceedance. The permit's issued and expiration dates are September 24, 2025 and December 31, 2025, as EPA's permit file stood when the record was loaded.