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Federal facility (Airports, Flying Fields, & Services), Selfridge Angb, Michigan. NPDES permit MI0055328 expired Oct 1, 2015; its limits still apply. Last 12 months: over a limit 5 times (last April 2026), 86 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| December 2025 | 004 | Oil & Grease, monthly average | 11 | ≤ 10 mg/L | 10% |
| April 2026 | 002 | Oil & Grease, daily maximum | 16 | ≤ 15 mg/L | 7% |
| April 2026 | 002 | Oil & Grease, monthly average | 16 | ≤ 10 mg/L | 60% |
| April 2026 | 003 | Oil & Grease, daily maximum | 29 | ≤ 15 mg/L | 93% |
| April 2026 | 003 | Oil & Grease, monthly average | 29 | ≤ 10 mg/L | 190% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Oct, Nov | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.3 mg/L | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2200 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2200 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1900 lb/d | Oct, Nov | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Coliform, fecal general | monthly average | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 32 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 34 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 34 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 32 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | Oct, Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 46000 lb/d | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 49000 lb/d | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 49000 lb/d | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 46000 lb/d | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 14000 lb/d | Oct, Nov | 001 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Oct, Nov | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.3 mg/L | Oct, Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2200 lb/d | Jan, Feb, Mar, Apr, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1900 lb/d | Oct, Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2200 lb/d | Jan, Feb, Mar, Apr, Dec | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Coliform, fecal general | monthly average | report only (#/100mL) | all year | 002 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 34 mg/L | Apr | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 32 mg/L | Jan, Feb, Mar, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | Oct, Nov | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 34 mg/L | Apr | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 49000 lb/d | Apr | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 46000 lb/d | Jan, Feb, Mar, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 14000 lb/d | Oct, Nov | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 49000 lb/d | Apr | 002 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 003 |
| pH | daily minimum | ≥ 6.5 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Coliform, fecal general | monthly average | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 003 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 004 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Coliform, fecal general | monthly average | report only (#/100mL) | all year | 004 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 004 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 004 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 005 |
| pH | daily minimum | ≥ 6.5 SU | all year | 005 |
| pH | daily maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Coliform, fecal general | monthly maximum | report only (#/100mL) | all year | 005 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 005 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 005 |
| pH | daily minimum | ≥ 6.5 SU | all year | 006 |
| pH | daily maximum | ≤ 9 SU | all year | 006 |
| Naphthalene | daily maximum | ≤ 5 ug/L | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 006 |
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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