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Transportation by Air — NPDES discharge permits in Michigan

Of the 3 permits in EPA's SIC 45 in MI, 3 went over a limit between 2025-10-01 and 2026-09-30 (BOD, carbonaceous [5 day, 20 C]: 2; Oil & Grease: 1). 3 are past the expiry date EPA's file holds; 0 have a renewal application overdue or due within 18 months. EPA's file of 2026-10-15.

FacilityLast 12 monthsPermit
Michigan Air National Guard
MI0055328 · Airports, Flying Fields, & Services
Over a limit 5×: Oil & Grease (5×)Permit past the expiry date EPA's file holds
Gerald R Ford International Airport Authority
MI0055735 · Airports, Flying Fields, & Services
Over a limit 4×: BOD, carbonaceous [5 day, 20 C] (4×)Permit past the expiry date EPA's file holds
Wayne County Airport Authority
MI0036846 · Airports, Flying Fields, & Services
Over a limit 1×: BOD, carbonaceous [5 day, 20 C] (1×)Permit past the expiry date EPA's file holds

The record is EPA's ICIS-NPDES file of 2026-10-15: values filed against each limit between Oct 1, 2025 and Sep 30, 2026. No reports on file may be EPA's gap, not the facility's.

For programs and AI agents: this screen as JSON at /api/v1/permits?state=MI&sic=45, narrowed with &over_limit=true, &parameter=phosphorus or &renewal=due; or add https://passage-data.com/mcp as a remote MCP server (tool list_permits). Free, no key. llms.txt

From EPA's ECHO data, not the permit document itself: your permit is the final word. All states