GAF/Elk Materials Corporation

NPDES permit INRM00063 · Minor NON-POTW · effective, expires 2030-10-25 · EPA's file as of 2026-09-26

Keep this permit as a site — opens New site at EPA's facility point (41.711744, -86.86291); you set the radius.

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

These are the last limits EPA's file holds for this permit, from an earlier version of it (version 2 in EPA's file): its current version carries none yet. Read your permit: a renewal can change them.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 3 forms filed late

Last period with anything received: 2025-10-25.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among IN permits in EPA's filings — check your permit).

Limits in force (24)

OutfallParameterStatisticLimitMonths
A001pHmaximum report only Oct
A001Solids, total suspendedmaximum report only Oct
A001Oil and grease, hexane extr methodmaximum report only Oct
A001Nitrogen, Kjeldahl, total [as N]maximum report only Oct
A001Nitrite + Nitrate total [as N]maximum report only Oct
A001Phosphorus, total [as P]maximum report only Oct
A001BOD, carbonaceous [5 day, 20 C]maximum report only Oct
A001Chemical Oxygen Demand [COD]maximum report only Oct
A002pHmaximum report only Oct
A002Solids, total suspendedmaximum report only Oct
A002Oil and grease, hexane extr methodmaximum report only Oct
A002Nitrogen, Kjeldahl, total [as N]maximum report only Oct
A002Nitrite + Nitrate total [as N]maximum report only Oct
A002Phosphorus, total [as P]maximum report only Oct
A002BOD, carbonaceous [5 day, 20 C]maximum report only Oct
A002Chemical Oxygen Demand [COD]maximum report only Oct
A003pHmaximum report only Oct
A003Solids, total suspendedmaximum report only Oct
A003Oil and grease, hexane extr methodmaximum report only Oct
A003Nitrogen, Kjeldahl, total [as N]maximum report only Oct
A003Nitrite + Nitrate total [as N]maximum report only Oct
A003Phosphorus, total [as P]maximum report only Oct
A003BOD, carbonaceous [5 day, 20 C]maximum report only Oct
A003Chemical Oxygen Demand [COD]maximum report only Oct

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states