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National Aquarium in Baltimore

Botanical And Zoological Gardens, Baltimore, Maryland. NPDES permit MD0059676, in force until Aug 31, 2029. Last 12 months: no values over a limit, 36 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (10 values), outfall 003 form A quarterly (10 values), outfall 004 form A quarterly (10 values), outfall 005 form A quarterly (12 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 22 required values missing, 44 of 48 reports late

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year001
E. colimonthly average≤ 126 MPN/100mLall year001
E. colimonthly average≤ 126 MPN/100mLall year001
pHminimum≥ 6.5 SUall year003
pHminimum≥ 6.5 SUall year003
pHmaximum≤ 8.5 SUall year003
pHmaximum≤ 8.5 SUall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year003
E. colimonthly average≤ 126 MPN/100mLall year003
E. colimonthly average≤ 126 MPN/100mLall year003
pHminimum≥ 6.5 SUall year004
pHminimum≥ 6.5 SUall year004
pHmaximum≤ 8.5 SUall year004
pHmaximum≤ 8.5 SUall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year004
E. colimonthly average≤ 126 MPN/100mLall year004
E. colimonthly average≤ 126 MPN/100mLall year004
pHminimum≥ 6.5 SUall year005
pHminimum≥ 6.5 SUall year005
pHmaximum≤ 8.5 SUall year005
pHmaximum≤ 8.5 SUall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
E. coliminimum≥ 6.5 MPN/100mLall year005
E. coliminimum≥ 6.5 MPN/100mLall year005
E. colimaximum≤ 8.5 MPN/100mLall year005
E. colimaximum≤ 8.5 MPN/100mLall year005

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/MD0059676 · MCP: https://passage-data.com/mcp