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Grace Davison-Curtis Bay

Industrial Inorganic Chemicals, major discharger, Baltimore, Maryland. NPDES permit MD0000311 expired Jul 31, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (42 values), outfall 002 form Q quarterly (2 values), outfall 001 form AA yearly, outfall MW08 form A quarterly, outfall MW16 form A quarterly, outfall MW17 form A quarterly, and 1 more form
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 33 reports late

Limits in force (58)

ParameterStatisticLimitMonthsOutfall
Turbiditymaximum monthly average≤ 45 NTUall year001
Turbiditymaximum daily average≤ 90 NTUall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly loadreport only (lb/mo)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedannual maximum≤ 569246 lb/yrall year001
Solids, total suspendedannual maximum≤ 683096 lb/yrall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, total [as N]monthly averagereport only (lb/mo)all year001
Nitrogen, total [as N]cumulative total≤ 155370 lb/yrMay–Oct001
Nitrogen, total [as N]cumulative total≤ 310737 lb/yrall year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 3600 lb/moall year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1700 lb/moall year001
Nitrogen, ammonia total [as N]daily maximum≤ 2140 lb/moApr, May001
Nitrogen, ammonia total [as N]daily maximum≤ 1420 lb/moJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 2600 lb/moSep–Nov001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1500 lb/moApr, May001
Nitrogen, ammonia total [as N]maximum monthly average≤ 970 lb/moJun–Aug001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1700 lb/moSep–Nov001
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, 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]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]cumulative total≤ 1236 lb/yrMay–Oct001
Phosphorus, total [as P]cumulative totalreport only (lb/mo)all year001
Phosphorus, total [as P]cumulative total≤ 2475 lb/yrall year001
Copper, total [as Cu]maximum monthly average≤ 122 mg/Lall year001
Copper, total [as Cu]maximum daily average≤ 122 mg/Lall year001
Phosphate, ortho [as P]daily maximumreport only (lb/d)all year001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year001
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year001
Phosphate, ortho [as P]monthly loadreport only (lb/mo)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
Flow, totaltotalreport only (Mgal/mo)all year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
Toxicity characteristic leaching procedurequarterly averagereport only (abst=0;prst=1)Mar, Jun, Sep, Dec002
Toxicity characteristic leaching procedurequarterly averagereport only (abst=0;prst=1)Mar, Jun, Sep, Dec002
Nitrogen, nitrate total [as N]valuereport only (mg/L)all yearMW08
Nitrogen, Kjeldahl, total [as N]valuereport only (mg/L)all yearMW08
Nitrogen, nitrate total [as N]valuereport only (mg/L)all yearMW16
Nitrogen, Kjeldahl, total [as N]valuereport only (mg/L)all yearMW16
Nitrogen, nitrate total [as N]valuereport only (mg/L)all yearMW17
Nitrogen, Kjeldahl, total [as N]valuereport only (mg/L)all yearMW17
Nitrogen, nitrate total [as N]valuereport only (mg/L)all yearMW18
Nitrogen, Kjeldahl, total [as N]valuereport only (mg/L)all yearMW18

How strict are these limits?

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

Same industry: the 7 Chemicals and Allied Products 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/MD0000311 · MCP: https://passage-data.com/mcp