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Gerald R Ford International Airport Authority

Airports, Flying Fields, & Services, Grand Rapids, Michigan. NPDES permit MI0055735 expired Oct 1, 2025; its limits still apply. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum23974≤ 11000 lb/d118%
January 2026BOD, carbonaceous [5 day, 20 C], daily maximum13322≤ 11000 lb/d21%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum26656≤ 11000 lb/d142%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum18585≤ 11000 lb/d69%

Limits in force (23)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec
pHdaily minimum≥ 6.5 SUJan, Feb, Mar, Apr, May, Oct, Nov, Dec
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, May, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Acetate, Totaldaily maximumreport only (ug/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)May
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Oct
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Apr
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Jan, Feb, Dec
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Nov
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 3600 lb/dOct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20000 lb/dApr
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 11000 lb/dJan, Feb, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum= 20000 lb/dNov
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Mar
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 11000 lb/dMar
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Mar
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20000 lb/dMar
Chemical oxygen demand [COD]daily maximum= 3500 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year

How strict are these limits?

Cited limits by parameter: Michigan's rules and the federal ones.

Same industry: the 3 Transportation by Air permits in Michigan.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0055735 · MCP: https://passage-data.com/mcp