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Airports, Flying Fields, & Services, Sterling, Virginia. NPDES permit VA0089541, in force until Jul 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 020 |
| pH | maximum | ≤ 9 SU | all year | 020 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 020 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 020 |
| Petrol hydrocarbons, total recoverable | monthly average | ≤ 15 mg/L | all year | 020 |
| Petrol hydrocarbons, total recoverable | daily maximum | ≤ 30 mg/L | all year | 020 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 020 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 020 |
| pH | minimum | ≥ 6 SU | all year | 021 |
| pH | maximum | ≤ 9 SU | all year | 021 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 021 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 021 |
| Petrol hydrocarbons, total recoverable | monthly average | ≤ 15 mg/L | all year | 021 |
| Petrol hydrocarbons, total recoverable | daily maximum | ≤ 30 mg/L | all year | 021 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 021 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 021 |
| Specific conductance | monthly average | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Specific conductance | daily maximum | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| pH | minimum | report only (SU) | all year | 025 |
| pH | maximum | report only (SU) | all year | 025 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 025 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 025 |
| Petrol hydrocarbons, total recoverable | monthly average | report only (mg/L) | all year | 025 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 025 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 025 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 025 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 025 |
| Specific conductance | monthly average | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| Specific conductance | daily maximum | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| pH | minimum | report only (SU) | all year | 551 |
| pH | maximum | report only (SU) | all year | 551 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 551 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 551 |
| Petrol hydrocarbons, total recoverable | monthly average | report only (mg/L) | all year | 551 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 551 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 551 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 551 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 551 |
| Specific conductance | monthly average | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| Specific conductance | daily maximum | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| pH | minimum | report only (SU) | all year | 552 |
| pH | maximum | report only (SU) | all year | 552 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 552 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 552 |
| Petrol hydrocarbons, total recoverable | monthly average | report only (mg/L) | all year | 552 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 552 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 552 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 552 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 552 |
| Specific conductance | monthly average | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| Specific conductance | daily maximum | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| pH | minimum | report only (SU) | all year | 553 |
| pH | maximum | report only (SU) | all year | 553 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 553 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 553 |
| Petrol hydrocarbons, total recoverable | monthly average | report only (mg/L) | all year | 553 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 553 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 553 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 553 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 553 |
| Specific conductance | monthly average | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| Specific conductance | daily maximum | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| pH | minimum | report only (SU) | all year | 554 |
| pH | maximum | report only (SU) | all year | 554 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 554 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 554 |
| Petrol hydrocarbons, total recoverable | monthly average | report only (mg/L) | all year | 554 |
| Petrol hydrocarbons, total recoverable | daily maximum | report only (mg/L) | all year | 554 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 554 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 554 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 554 |
| Specific conductance | monthly average | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| Specific conductance | daily maximum | report only (uS/cm) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| pH | minimum | report only (SU) | all year | 555 |
| pH | maximum | report only (SU) | all year | 555 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 555 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 555 |
| Petrol hydrocarbons, total recoverable | monthly average | ≤ 15 mg/L | all year | 555 |
| Petrol hydrocarbons, total recoverable | daily maximum | ≤ 30 mg/L | all year | 555 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 555 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 555 |
| 1,2-Propanediol | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
| 1,2-Propanediol | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 555 |
Cited limits by parameter: Virginia's rules and the federal ones.
Same industry: the 6 Transportation by Air permits in Virginia.
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