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Airports, Flying Fields, & Services, Tarrant County, Texas. NPDES permit TX0025101, in force until Apr 19, 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 | daily maximum | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 001 |
| Ethylene glycol | daily maximum | report only (mg/L) | all year | 001 |
| Hydrocarbons, petroleum | daily maximum | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 019 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 019 |
| pH | minimum | ≥ 6 SU | all year | 019 |
| pH | maximum | ≤ 9 SU | all year | 019 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 019 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 019 |
| Copper, total [as Cu] | daily maximum | ≤ 2 mg/L | all year | 019 |
| Zinc, total [as Zn] | daily maximum | ≤ 6 mg/L | all year | 019 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 019 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 019 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 019 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 019 |
| Ethylene glycol | daily maximum | report only (mg/L) | all year | 019 |
| Hydrocarbons, petroleum | daily maximum | ≤ 15 mg/L | all year | 019 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 020 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 020 |
| pH | minimum | ≥ 6 SU | all year | 020 |
| pH | maximum | ≤ 9 SU | all year | 020 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 020 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 020 |
| Copper, total [as Cu] | daily maximum | ≤ 2 mg/L | all year | 020 |
| Zinc, total [as Zn] | daily maximum | ≤ 6 mg/L | all year | 020 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 020 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 020 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 020 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 020 |
| Ethylene glycol | daily maximum | report only (mg/L) | all year | 020 |
| Hydrocarbons, petroleum | daily maximum | ≤ 15 mg/L | all year | 020 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 023 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 023 |
| pH | minimum | ≥ 6 SU | all year | 023 |
| pH | maximum | ≤ 9 SU | all year | 023 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 023 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 023 |
| Copper, total [as Cu] | daily maximum | ≤ 2 mg/L | all year | 023 |
| Zinc, total [as Zn] | daily maximum | ≤ 6 mg/L | all year | 023 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 023 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 023 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 023 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 023 |
| Ethylene glycol | daily maximum | report only (mg/L) | all year | 023 |
| Hydrocarbons, petroleum | daily maximum | ≤ 15 mg/L | all year | 023 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 059 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 059 |
| pH | minimum | ≥ 6 SU | all year | 059 |
| pH | maximum | ≤ 9 SU | all year | 059 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 059 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | 059 |
| Copper, total [as Cu] | daily maximum | ≤ 2 mg/L | all year | 059 |
| Zinc, total [as Zn] | daily maximum | ≤ 6 mg/L | all year | 059 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 059 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 059 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 059 |
| Propylene glycol, total | daily maximum | report only (mg/L) | all year | 059 |
| Ethylene glycol | daily maximum | report only (mg/L) | all year | 059 |
| Hydrocarbons, petroleum | daily maximum | ≤ 15 mg/L | all year | 059 |
Cited limits by parameter: Texas's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/TX0025101 · MCP: https://passage-data.com/mcp