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Naval Research Laboratory

Federal facility (National Security), Calvert County, Maryland. NPDES permit MD0020168, in force until Jun 30, 2030. Last 12 months: over a limit once (last April 2026), 72 required values missing, 10 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (32 values), outfall 101 form A monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 6 required values missing, 9 of 15 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, percent removal, minimum77 %≥ 85 %53%

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 10 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 10 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 15 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 5 lb/dall year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Solids, total suspendedmaximum weekly average≤ 7.5 lb/dall year001
Solids, total suspendedannual maximum≤ 2000 lb/yrall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]annual maximumreport only (lb/yr)all year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.4 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 3.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .7 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.5 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Phosphorus, total [as P]annual maximumreport only (lb/yr)all year001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmaximum< .1 mg/Lall year001
Coliform, fecal generalmaximum≤ 14 MPN/100mLall year001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
Flow, totalmonthly averagereport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101

New limits from Jan 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average0.8 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.065 lb/d (6 values)0.0813×
Nitrogen, ammonia total [as N], maximum monthly average1.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.5 mg/L (6 values)0.312×
Nitrogen, ammonia total [as N], maximum monthly average0.4 lb/d (May–Oct)tighter0.02 lb/d (3 values)0.05×
Nitrogen, ammonia total [as N], maximum monthly average0.7 mg/L (May–Oct)tighter0.5 mg/L (4 values)0.714×

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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0020168 · MCP: https://passage-data.com/mcp