Clean Water Act discharge permit · NPDES MIS510944

AJAX MATERIALS CORP-PLANT 4, Flint, MI: NPDES MIS510944 discharge permit, effluent exceedances, inspections, penalties

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

AJAX MATERIALS CORP-PLANT 4, held by Ajax Materials Corporation, holds NPDES permit MIS510944. EPA’s file records it issued December 19, 2022 and expiring April 1, 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.

What the register holds for AJAX MATERIALS CORP-PLANT 4: its NPDES ID, its permit type and status, its dates, its address in Flint, Michigan. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MIS510944.

Identity

Facility as filed	AJAX MATERIALS CORP-PLANT 4
Permittee as filed	Ajax Materials Corporation
NPDES ID	MIS510944
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 19, 2022
Expiration date	April 1, 2025
Issuing agency	State
Address	Flint, MI 48505
Receiving water impaired	303(D) Listed
Subwatershed	Clark Drain-Flint River (HUC 040802040409)
Other EPA IDs (FRS)	RCRA handler MIK145655181; ICIS-AIR source MI00000000000P1171

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MIS510944.

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 MIS510944.

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, MIS510944.

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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 MIS510944 there.

Nearby on the register

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

The permit filed as AJAX MATERIALS CORP-PLANT 4 is one of 34 general permit coverages in Flint, this one included, and it sits among 20 NPDES permits in the Clark Drain-Flint River subwatershed, this one included. Of all 34 Flint general permit coverages, 64.7% carry an earlier issue date than this permit, and 23.5% of those same 34 coverages have a violation on file. The permit has no pollutants under a numeric limit and no pollutants with an effluent exceedance.