Clean Water Act discharge permit · NPDES MIS111688

DUNCAN AVIATION-KZOO, Kalamazoo, MI: NPDES MIS111688 discharge permit, effluent exceedances, inspections, penalties

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

DUNCAN AVIATION-KZOO, held by Duncan Aviation, holds NPDES permit MIS111688, which discharges to Davis Creek. EPA’s file records it issued October 22, 2021 and expiring April 1, 2026.

DUNCAN AVIATION-KZOO, Kalamazoo, Michigan: Coverage under a general permit MIS111688, held by Duncan Aviation; Effective; issued October 22, 2021, term to April 1, 2026, by State; discharges to Davis Creek.

July 31, 2025: Failure to develop, maintain, or get approval of an adequate SWPPP (industrial stormwater) (ST6).

Other permits held by Duncan Aviation

DUNCAN AVIATION, Battle Creek: MIS112200, issued May 31, 2026
DUNCAN AVIATION, Battle Creek: MIS120703, issued December 17, 2021

DUNCAN AVIATION-KZOO among its neighbors

EPA’s permit file holds 10 discharge permits in the Portage Creek subwatershed (HUC 040500030603), MIS111688 among them.

Other permits in the Portage Creek subwatershed (HUC 040500030603)

KALAMAZOO CDC MS4, Kalamazoo: MI0060343, minor permit, permit term to October 1, 2025
KALAMAZOO DPS - BURDICK ST WATER MAIN GWCU, Kalamazoo: MIG081302, minor permit, discharging to Axtell Creek, permit term to April 1, 2030
KALAMAZOO PS MS4-KALAMAZOO, Kalamazoo: MI0059866, minor permit, permit term to October 1, 2025
SCHAFER BAKERIES-KALAMAZOO, Kalamazoo: MIS110720, minor permit, discharging to Portage Creek, permit term to March 31, 2026
SCHUPAN & SONS INC - PEEKSTOCK ROAD, Kalamazoo: MIS112068, minor permit, discharging to Davis Creek, permit term to April 1, 2026
SENNECA HOLDINGS, Portage: MIS112137, minor permit, discharging to West Lake, permit term to April 1, 2026
SPEED BIRD X, Portage: MIS111896, minor permit, discharging to Portage Creek, permit term to April 1, 2021
STREBOR INC, Kalamazoo: MI0044288, minor permit, discharging to Portage Creek, permit term to October 1, 2020
STRYKER AVIATION, Portage: MIS111877, minor permit, permit term to April 1, 2021

Identity

Facility as filed	DUNCAN AVIATION-KZOO
Permittee as filed	Duncan Aviation
NPDES ID	MIS111688
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	October 22, 2021
Expiration date	April 1, 2026
Issuing agency	State
Address	Kalamazoo, MI 49002
Receiving water	Davis Creek
Receiving water impaired	303(D) Listed
Subwatershed	Portage Creek (HUC 040500030603)

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 MIS111688.

Inspections, violations and enforcement

1Single-event violations

Date	What EPA recorded	Agency
July 31, 2025	Failure to develop, maintain, or get approval of an adequate SWPPP (industrial stormwater)	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES MIS111688.

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 MIS111688.

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Nearby on the register

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

This public-records page covers NPDES discharge permit MIS111688, held by Duncan Aviation for DUNCAN AVIATION-KZOO in Kalamazoo, MI, which discharges to Davis Creek within the Portage Creek subwatershed (HUC 040500030603). The permit's status is listed as Effective, with an issue date of October 22, 2021 and an expiration date of April 1, 2026, and the facility's figures show 0 pollutants on file, 0 under a numeric limit, 0 with a violation of any kind and 0 with an effluent exceedance.