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National Institutes of Health

Federal facility (Admin. Of Public Health Programs), Bethesda, Maryland. NPDES permit MD0025496, in force until Jan 31, 2030. Last 12 months: over a limit 6 times (last June 2026), 3 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (44 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 3 of 4 reports late

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

Period endingParameterReportedLimitOver by
December 2025Copper, total [as Cu], daily maximum58 ug/L≤ 26 ug/L123%
December 2025Copper, total [as Cu], monthly average42 ug/L≤ 16.2 ug/L159%
March 2026Copper, total [as Cu], daily maximum63 ug/L≤ 26 ug/L142%
March 2026Copper, total [as Cu], monthly average44 ug/L≤ 16.2 ug/L172%
June 2026Copper, total [as Cu], daily maximum69 ug/L≤ 26 ug/L165%
June 2026Copper, total [as Cu], monthly average57 ug/L≤ 16.2 ug/L252%

Limits in force (44)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
pHminimum≥ 6.5 SUall year
pHminimum≥ 6.5 SUall year
pHdaily maximum≤ 8.5 SUall year
pHdaily maximum≤ 8.5 SUall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (lb/yr)all year
Phosphorus, total [as P]daily maximumreport only (lb/yr)all year
Phosphorus, total [as P]monthly averagereport only (lb/mo)all year
Phosphorus, total [as P]monthly averagereport only (lb/mo)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Copper, dissolved [as Cu]monthly averagereport only (ug/L)all year
Copper, dissolved [as Cu]monthly averagereport only (ug/L)all year
Copper, dissolved [as Cu]daily maximumreport only (ug/L)all year
Copper, dissolved [as Cu]daily maximumreport only (ug/L)all year
Copper, total [as Cu]monthly average≤ 16.2 ug/Lall year
Copper, total [as Cu]monthly average≤ 16.2 ug/Lall year
Copper, total [as Cu]daily maximum≤ 26 ug/Lall year
Copper, total [as Cu]daily maximum≤ 26 ug/Lall year
Iron, total [as Fe]monthly averagereport only (mg/L)all year
Iron, total [as Fe]monthly averagereport only (mg/L)all year
Iron, total [as Fe]daily maximumreport only (mg/L)all year
Iron, total [as Fe]daily maximumreport only (mg/L)all year
Iron, dissolved [as Fe]monthly averagereport only (mg/L)all year
Iron, dissolved [as Fe]monthly averagereport only (mg/L)all year
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year
Iron, dissolved [as Fe]daily maximumreport only (mg/L)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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ 11 ug/Lall year
Chlorine, total residualmonthly average≤ 11 ug/Lall year
Chlorine, total residualdaily maximum≤ 19 ug/Lall year
Chlorine, total residualdaily maximum≤ 19 ug/Lall year
Temp. diff. between intake and dischargedaily maximum≤ 0 deg Fall year
Temp. diff. between intake and dischargedaily maximum≤ 0 deg Fall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0025496 · MCP: https://passage-data.com/mcp