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Federal facility (National Security), Bethesda, Maryland. NPDES permit MD0003051, in force until Jun 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 8.5 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 002 |
| Silver, total [as Ag] | monthly average | report only (mg/L) | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 002 |
| Temp. diff. between up/down stream deg. F | daily maximum | ≤ 0 deg F | 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 |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 8.5 SU | all year | 003 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | maximum daily average | ≤ 60 mg/L | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 003 |
| Silver, total [as Ag] | monthly average | report only (mg/L) | all year | 003 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 003 |
| Temp. diff. between up/down stream deg. F | daily maximum | ≤ 0 deg F | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 8.5 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Temp. diff. between up/down stream deg. F | daily maximum | ≤ 0 deg F | 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 |
| Chlorine, total residual | monthly average | report only (mg/L) | all year | 004 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 011 |
| pH | maximum | ≤ 8.5 SU | all year | 011 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 011 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 011 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 011 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 011 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 011 |
| Silver, total [as Ag] | monthly average | report only (mg/L) | all year | 011 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 011 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 011 |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year | 011 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 011 |
Cited limits by parameter: Maryland's rules and the federal ones.
Same industry: the 8 National Security and International Affairs permits in Maryland.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MD0003051 · MCP: https://passage-data.com/mcp