GenOn MD Ash Management, LLC — NPDES permit MD0057584: limits, due date and EPA's record

Refuse Systems, Dickerson, Maryland. NPDES permit MD0057584, in force until Feb 28, 2030. Last 12 months: no values over a limit, 2 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Limits in force (55)

Parameter	Statistic	Limit	Months
Conductivity	monthly average	report only (uS/cm)	all year
Conductivity	daily maximum	report only (uS/cm)	all year
Oxygen, dissolved [DO]	minimum	≥ 5 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 8.5 SU	all year
Solids, total suspended	monthly average	≤ 30 mg/L	all year
Solids, total suspended	daily maximum	≤ 70 mg/L	all year
Oil & Grease	monthly average	≤ 15 mg/L	all year
Oil & Grease	daily maximum	≤ 20 mg/L	all year
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year
Nitrogen, total [as N]	monthly average	report only (lb/d)	all year
Nitrogen, total [as N]	daily maximum	report only (lb/d)	all year
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year
Phosphorus, total [as P]	daily maximum	report only (lb/d)	all year
Hardness, total [as CaCO3]	monthly average	report only (mg/L)	all year
Hardness, total [as CaCO3]	daily maximum	report only (mg/L)	all year
Arsenic, Inorganic	monthly average	report only (ug/L)	all year
Arsenic, Inorganic	daily maximum	report only (ug/L)	all year
Arsenic, total [as As]	monthly average	≤ 150 ug/L	all year
Arsenic, total [as As]	daily maximum	≤ 340 ug/L	all year
Boron, total [as B]	monthly average	report only (mg/L)	all year
Boron, total [as B]	daily maximum	report only (mg/L)	all year
Cadmium, total [as Cd]	monthly average	≤ .25 ug/L	all year
Cadmium, total [as Cd]	daily maximum	≤ 2 ug/L	all year
Chromium, total [as Cr]	monthly average	report only (mg/L)	all year
Chromium, total [as Cr]	daily maximum	report only (mg/L)	all year
Copper, total [as Cu]	monthly average	≤ 9 ug/L	all year
Copper, total [as Cu]	daily maximum	≤ 13 ug/L	all year
Iron, total [as Fe]	monthly average	≤ 3.5 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 7 mg/L	all year
Lead, total [as Pb]	monthly average	≤ 2.5 ug/L	all year
Lead, total [as Pb]	daily maximum	≤ 65 ug/L	all year
Nickel, total [as Ni]	monthly average	≤ 52 ug/L	all year
Nickel, total [as Ni]	daily maximum	≤ 470 ug/L	all year
Zinc, total [as Zn]	monthly average	≤ 120 ug/L	all year
Zinc, total [as Zn]	daily maximum	≤ 120 ug/L	all year
Selenium, total [as Se]	monthly average	≤ 5 ug/L	all year
Selenium, total [as Se]	daily maximum	≤ 20 ug/L	all year
Whole effluent toxicity	monthly average	report only (%)	all year
Whole effluent toxicity	daily maximum	≤ 1 %	all year
Chloride	monthly average	≤ 230 mg/L	all year
Chloride	daily maximum	≤ 860 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (gal/d)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (gal/d)	all year
Sulfates, total [as SO4]	monthly average	report only (mg/L)	all year
Sulfates, total [as SO4]	daily maximum	report only (mg/L)	all year
Solids, total dissolved	monthly average	report only (mg/L)	all year
Solids, total dissolved	daily maximum	report only (mg/L)	all year
Mercury, total [as Hg]	monthly average	≤ .77 ug/L	all year
Mercury, total [as Hg]	daily maximum	≤ 1.4 ug/L	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/MD0057584 · MCP: https://passage-data.com/mcp