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National Institutes of Health

Federal facility (Noncommercial Research Organizations), Bethesda, Maryland. NPDES permit MD0020931, in force until Aug 31, 2029. Last 12 months: no values over a limit, 35 required values missing, 9 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (30 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 7 of 12 reports late

Limits in force (43)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 10 mg/LApr–Sep
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 15 mg/LJan, Feb, Mar, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 mg/LApr–Sep
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 22.5 mg/LJan, Feb, Mar, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 8.3 lb/dApr–Sep
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 13 lb/dJan, Feb, Mar, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 13 lb/dApr–Sep
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 18.8 lb/dJan, Feb, Mar, Oct, Nov, Dec
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmaximum monthly average≤ 10 mg/LApr–Sep
Solids, total suspendedmaximum weekly average≤ 15 mg/LApr–Sep
Solids, total suspendedmaximum monthly average≤ 8.3 lb/dApr–Sep
Solids, total suspendedmaximum weekly average≤ 13 lb/dApr–Sep
Solids, total suspendedcumulative totalreport only (lb/yr)all year
Solids, total suspendedmonthly totalreport only (lb/mo)Jan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendedmaximum monthly average≤ 15 mg/LJan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendedmaximum weekly average≤ 22.5 mg/LJan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendedmaximum monthly average≤ 13 lb/dJan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendedmaximum weekly average≤ 18.8 lb/dJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all year
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year
Nitrogen, organic total [as N]monthly loadreport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.5 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.3 lb/dJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 lb/dJan, Feb, Mar, Oct, Nov, Dec
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly loadreport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all year
Phosphorus, total [as P]monthly totalreport only (lb/mo)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
Chlorine, total residualmaximum< .1 mg/Lall year
E. colimaximum monthly geometric mean≤ 126 MPN/100mLall year
Phosphorous, in total orthophosphatemonthly averagereport only (mg/L)all year
Phosphorous, in total orthophosphatemonthly loadreport only (lb/d)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

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

Same industry: the 9 Engineering, Accounting, Research and Management Services 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/MD0020931 · MCP: https://passage-data.com/mcp