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Airports, Flying Fields, & Services, Indianapolis, Indiana. NPDES permit IN0058238, in force until Apr 30, 2028. Last 12 months: no values over a limit, 8 required values missing, 28 of 77 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, air [degrees Fahrenheit] | daily maximum | report only (deg F) | all year | 002 |
| Temperature, air [degrees Fahrenheit] | daily maximum | report only (deg F) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.4 mg/L | all year | 002 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 002 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | 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 |
| Propylene glycol, total | daily maximum | ≤ 200 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 002 |
| Chemical Oxygen Demand [COD] | daily maximum | ≤ 500 mg/L | all year | 002 |
| Chemical Oxygen Demand [COD] | daily maximum | ≤ 154 mg/L | all year | 002 |
| Chemical Oxygen Demand [COD] | daily maximum | ≤ 62 mg/L | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| pH | daily maximum | report only (SU) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 003 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 003 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 003 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 003 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 003 |
| Temperature, air [degrees Fahrenheit] | daily maximum | report only (deg F) | all year | 004 |
| Temperature, air [degrees Fahrenheit] | daily maximum | report only (deg F) | all year | 004 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 004 |
| pH | daily minimum | ≥ 6 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.4 mg/L | all year | 004 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 004 |
| Potassium, total [as K] | daily maximum | report only (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 |
| Propylene glycol, total | daily maximum | ≤ 200 mg/L | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 004 |
| Chemical Oxygen Demand [COD] | daily maximum | ≤ 500 mg/L | all year | 004 |
| Chemical Oxygen Demand [COD] | daily maximum | ≤ 154 mg/L | all year | 004 |
| Chemical Oxygen Demand [COD] | daily maximum | ≤ 62 mg/L | all year | 004 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 004 |
| pH | daily maximum | report only (SU) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 005 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 005 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 005 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 005 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 005 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 005 |
| pH | daily maximum | report only (SU) | all year | 006 |
| pH | daily maximum | report only (SU) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 006 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 006 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 006 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | 006 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 006 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 006 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 006 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 006 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 006 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 006 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 006 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 006 |
| pH | daily maximum | report only (SU) | all year | 007 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 007 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | 007 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 007 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 007 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | all year | 007 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 007 |
Cited limits by parameter: Indiana's rules and the federal ones.
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