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Department of the Navy - Nas P

Federal facility (National Security), Naval Air Station Patuxent River, Maryland. NPDES permit MD0020150, in force until Jan 31, 2027. Last 12 months: over a limit once (last December 2025), 5 required values missing, 1 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (10 values)
Renewal application due
Aug 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 4 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025Oil & Grease, daily maximum142 mg/L≤ 15 mg/L847%

Limits in force (10)

ParameterStatisticLimitMonths
pHminimum≥ 6.5 SUall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
pHmaximum≤ 8.5 SUall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year

How strict are these limits?

Cited limits by parameter: Maryland's rules and the federal ones.

Same industry: the 8 National Security and International Affairs permits in Maryland.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0020150 · MCP: https://passage-data.com/mcp