Washington County Department of Water Quality — NPDES permit MD0003221: limits, due date and EPA's record

Federal facility (Sewerage Systems), Cascade, Maryland. NPDES permit MD0003221, in force until May 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (48)

Parameter	Statistic	Limit	Months	Outfall
Oxygen, dissolved [DO]	instantaneous minimum	≥ 5 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum monthly average	≤ 10 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum weekly average	≤ 15 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum monthly average	≤ 50 lb/d	all year	001
BOD, 5-day, 20 deg. C	maximum weekly average	≤ 75 lb/d	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 8.5 SU	all year	001
Solids, total suspended	maximum monthly average	≤ 10 mg/L	all year	001
Solids, total suspended	maximum weekly average	≤ 15 mg/L	all year	001
Solids, total suspended	maximum monthly average	≤ 50 lb/d	all year	001
Solids, total suspended	maximum weekly average	≤ 75 lb/d	all year	001
Solids, total suspended	cumulative total	≤ 54820 lb/yr	all year	001
Solids, total suspended	monthly total	report only (lb/mo)	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	cumulative total	≤ 7306 lb/yr	all year	001
Nitrogen, total [as N]	monthly total	report only (lb/mo)	all year	001
Nitrogen, total [as N]	annual total	report only (lb/yr)	all year	001
Nitrogen, total [as N]	annual total	report only (lb/yr)	all year	001
Nitrogen, organic total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	maximum monthly average	≤ .65 mg/L	all year	001
Nitrogen, ammonia total [as N]	maximum weekly average	≤ .98 mg/L	all year	001
Nitrogen, ammonia total [as N]	maximum monthly average	≤ 3.3 lb/d	all year	001
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 5 lb/d	all year	001
Nitrite + Nitrate total [as N]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	cumulative total	≤ 548 lb/yr	all year	001
Phosphorus, total [as P]	monthly total	report only (lb/mo)	all year	001
Phosphorus, total [as P]	annual total	report only (lb/yr)	all year	001
Phosphorus, total [as P]	annual total	report only (lb/yr)	all year	001
Phosphate, ortho [as P]	monthly average	report only (mg/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	maximum	< .012 mg/L	all year	001
E. coli	maximum monthly geometric mean	≤ 126 MPN/100mL	all year	001
BOD, 5-day, percent removal	minimum	≥ 85 %	all year	001
Solids, suspended percent removal	minimum	≥ 85 %	all year	001
Flow, total	monthly total	report only (Mgal/mo)	all year	001
Flow, total	annual total	report only (Mgal/yr)	all year	001
Flow, total	annual total	report only (Mgal/yr)	all year	001
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	101
Solids, total suspended	monthly average	report only (mg/L)	all year	101
Solids, total suspended	cumulative total	report only (lb/yr)	all year	TRAD
Solids, total suspended	cumulative total	report only (lb/yr)	all year	TRAD
Nitrogen, total [as N]	aggregate rolling median	report only (lb/yr)	all year	TRAD
Nitrogen, total [as N]	cumulative total	report only (lb/yr)	all year	TRAD
Phosphorus, total [as P]	cumulative total	report only (lb/yr)	all year	TRAD
Phosphorus, total [as P]	cumulative total	report only (lb/yr)	all year	TRAD
Flow	year-to-date total	report only (Mgal/yr)	all year	TRAD

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/MD0003221 · MCP: https://passage-data.com/mcp