Clean Water Act discharge permit · NPDES INRM00063

GAF/ELK MATERIALS CORPORATION, Michigan City, IN: NPDES INRM00063 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
8Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

GAF/ELK MATERIALS CORPORATION, held by GAF/Elk Materials Corporation, holds NPDES permit INRM00063. EPA’s file records it issued June 30, 2020 and expiring October 25, 2025.

GAF/ELK MATERIALS CORPORATION, Michigan City, Indiana: Individual permit INRM00063, held by GAF/Elk Materials Corporation; Industrial stormwater; Administratively continued (past its expiration date and still in force until reissued); issued June 30, 2020, term to October 25, 2025, by IDEM; Asphalt Shingle and Coating Materials Manufacturing.

pH: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Solids, total suspended: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Oil and grease, hexane extr method: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrite + Nitrate total [as N]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
BOD, carbonaceous [5 day, 20 C]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Chemical Oxygen Demand [COD]: 3 limits, 0 violations of any kind, 0 effluent exceedances.

Indiana holds 1,027 Industrial stormwater coverages of this permit type in EPA’s file; 694 were issued before INRM00063.

Coverages issued nearest INRM00063

June 16, 2020: OSCAR WINSKI COMPANY, Lafayette, INRM00065, held by Oscar Winski Company
June 18, 2020: ATMI INDY LLC, Greenfield, INRM01875, held by ATMI Indy LLC
June 25, 2020: RBC PRECISION PRODUCTS, Bremen, INRM00061, held by RBC Precision Products
June 29, 2020: SINGLETON STONE LLC, Hebron, INRM01853, held by Singleton Stone LLC
June 30, 2020: CREATIVE FOAM MEDICAL SYSTEMS, Bremen, INRM00008, held by Creative Foam Medical Systems
July 2, 2020: PPG INDUSTRIES INCORPORATED, Brazil, INRM01921, held by PPG Industries Incorporated
July 2, 2020: E & B PAVING LLC BLOOMINGTON MARTINSVILLE, Martinsville, INRM02682, held by E & B Paving LLC Bloomington Martinsville
July 7, 2020: FORT WAYNE POOLS INC, Fort Wayne, INRM00147, held by Fort Wayne Pools Inc
July 8, 2020: BLOOMINGTON AUTO PARTS, Bloomington, INRM01328, held by Bloomington Auto Parts
July 9, 2020: MODERN FORGE INDIANA LLC, Merrillville, INRM01878, held by Modern Forge Indiana LLC

GAF/ELK MATERIALS CORPORATION among its neighbors

EPA’s permit file holds 25 discharge permits in the Trail Creek subwatershed (HUC 040400010105), INRM00063 among them. Its county holds 59, 4 of them major permits; INRM00063 is a minor permit.

Other permits in the Trail Creek subwatershed (HUC 040400010105)

AUTUMN CREEK MOBILE HOME PARK, Michigan City: IN0050041, minor permit, discharging to LAKE MICHIGAN/EAST BRANCH TRAIL CRK, permit term to May 31, 2022
BEACHWOOD SUBDIVISION, Michigan City: INRA10838, minor permit, permit term to November 6, 2027
BLOCKSOM & COMPANY, Michigan City: INRM00405, minor permit, discharging to Trail Creek, permit term to August 22, 2023
BOYS & GIRLS CLUB - MICHIGAN CITY, Michigan City: INRA15304, minor permit, permit term to January 22, 2030
CYTEC-SOLVAY GROUNDWATER REMEDIATION PROJECT, Michigan City: INRA15539, minor permit, permit term to March 10, 2030
FEDERAL MOGUL CORP, Michigan City: IN0059226, minor permit, discharging to TRAIL CR VIA UNNAMED TRIBUTARY, permit term to November 30, 2011
FRANCISCAN HEALTH DEMOLITION, Michigan City: INRA06707, minor permit, permit term to November 29, 2025
GRANDMA'S ATTIC, Michigan City: INRA17000, minor permit, permit term to October 14, 2030
HWY 12/LAKE AVE LIFT STATION PROJECT, Michigan City: INRA16566, minor permit, permit term to August 4, 2030
IN DOT DES 2000607 2101096 2500075 U.S. 12 HMA OVERLAY PREVENTATIVE MAIN, Michigan City: INRA17277, minor permit, permit term to December 7, 2030

What the register holds for GAF/ELK MATERIALS CORPORATION: its NPDES ID, its permit type and status, its dates, its address in Michigan City, Indiana, and 8 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES INRM00063.

Identity

Facility as filed	GAF/ELK MATERIALS CORPORATION
Permittee as filed	GAF/Elk Materials Corporation
NPDES ID	INRM00063
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
Program	Industrial stormwater
Issued	June 30, 2020
Expiration date	October 25, 2025
Issuing agency	IDEM
Address	Michigan City, IN 46360
Subwatershed	Trail Creek (HUC 040400010105)
NAICS	324122 – Asphalt Shingle and Coating Materials Manufacturing
SIC	2952 – Asphalt Felts And Coatings
Other EPA IDs (FRS)	RCRA handler IND040272312

Effluent limits and exceedances

8Pollutants on file
8Under 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
pH	3	0	0
Solids, total suspended	3	0	0
Oil and grease, hexane extr method	3	0	0
Nitrogen, Kjeldahl, total [as N]	3	0	0
Nitrite + Nitrate total [as N]	3	0	0
Phosphorus, total [as P]	3	0	0
BOD, carbonaceous [5 day, 20 C]	3	0	0
Chemical Oxygen Demand [COD]	3	0	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES INRM00063.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES INRM00063.

Inspections

EPA’s inspection file holds no inspection for NPDES INRM00063.

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 INRM00063.

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Nearby on the register

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

This public-records page covers NPDES permit INRM00063, held by GAF/Elk Materials Corporation in Michigan City, Indiana, under the Clean Water Act discharge permit register. The facts list 8 pollutants under a numeric limit, 0 pollutants with an effluent exceedance, and a discharger class of 8.