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Airports, Flying Fields, & Services, Philadelphia, Pennsylvania. NPDES permit PA0056766, in force until Feb 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| pH | instantaneous minimum | ≥ 6 SU | Jan, Feb, Mar, Apr, May, Dec | 001 |
| pH | instantaneous maximum | ≤ 9 SU | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Oil & Grease | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Oil & Grease | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Acetic acid | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Potassium, total [as K] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Iron, total [as Fe] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Propylene glycol, total | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Solids, total dissolved | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Ethylene glycol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| pH | instantaneous minimum | ≥ 6 SU | Jan, Feb, Mar, Apr, May, Dec | 005 |
| pH | instantaneous maximum | ≤ 9 SU | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Oil & Grease | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Acetic acid | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Potassium, total [as K] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Iron, total [as Fe] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Propylene glycol, total | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Solids, total dissolved | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Ethylene glycol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Dec | 005 |
| Oil & Grease | quarterly average | ≤ 15 mg/L | all year | 101 |
| Oil & Grease | instantaneous maximum | ≤ 30 mg/L | all year | 101 |
| Petrol hydrocarbons, total recoverable | quarterly average | ≤ 15 mg/L | all year | 101 |
| Petrol hydrocarbons, total recoverable | instantaneous maximum | ≤ 30 mg/L | all year | 101 |
| Oil & Grease | quarterly average | ≤ 15 mg/L | all year | 201 |
| Oil & Grease | daily maximum | ≤ 30 mg/L | all year | 201 |
| Petrol hydrocarbons, total recoverable | quarterly average | ≤ 15 mg/L | all year | 201 |
| Petrol hydrocarbons, total recoverable | daily maximum | ≤ 30 mg/L | all year | 201 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
Same industry: the 14 Transportation by Air permits in Pennsylvania.
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