Usarmy Letterkenny Army Depot — NPDES permit PA0010502: limits, due date and EPA's record

Federal facility (Ordnance And Accessories), Chambersburg, Pennsylvania. NPDES permit PA0010502, in force until May 31, 2027. Last 12 months: no values over a limit, 80 required values missing. Source: EPA ECHO, Oct 22, 2026.

Limits in force (117)

Parameter	Statistic	Limit	Months	Outfall
pH	instantaneous minimum	≥ 6 SU	all year	001
pH	instantaneous maximum	≤ 9 SU	all year	001
Solids, total suspended	monthly average	≤ 10 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 20 mg/L	all year	001
Solids, total suspended	monthly average	report only (lb/d)	all year	001
Solids, total suspended	daily maximum	report only (lb/d)	all year	001
Oil & Grease	monthly average	≤ 15 mg/L	all year	001
Oil & Grease	daily maximum	≤ 30 mg/L	all year	001
Oil & Grease	monthly average	report only (lb/d)	all year	001
Oil & Grease	daily maximum	report only (lb/d)	all year	001
Phosphorus, total [as P]	monthly average	≤ 2 mg/L	all year	001
Phosphorus, total [as P]	daily maximum	≤ 4 mg/L	all year	001
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year	001
Phosphorus, total [as P]	daily maximum	report only (lb/d)	all year	001
Cyanide, total [as CN]	monthly average	≤ .65 mg/L	all year	001
Cyanide, total [as CN]	daily maximum	≤ 1.2 mg/L	all year	001
Cyanide, total [as CN]	monthly average	report only (lb/d)	all year	001
Cyanide, total [as CN]	daily maximum	report only (lb/d)	all year	001
Chloride [as Cl]	monthly average	report only (mg/L)	all year	001
Chloride [as Cl]	daily maximum	report only (mg/L)	all year	001
Chloride [as Cl]	monthly average	report only (lb/d)	all year	001
Chloride [as Cl]	daily maximum	report only (lb/d)	all year	001
Sulfate, total [as SO4]	monthly average	report only (mg/L)	all year	001
Sulfate, total [as SO4]	daily maximum	report only (mg/L)	all year	001
Sulfate, total [as SO4]	monthly average	report only (lb/d)	all year	001
Sulfate, total [as SO4]	daily maximum	report only (lb/d)	all year	001
Cadmium, total [as Cd]	monthly average	≤ .0015 mg/L	all year	001
Cadmium, total [as Cd]	daily maximum	≤ .0023 mg/L	all year	001
Cadmium, total [as Cd]	monthly average	≤ .004 lb/d	all year	001
Cadmium, total [as Cd]	daily maximum	≤ .005 lb/d	all year	001
Chromium, total [as Cr]	monthly average	≤ 1.71 mg/L	all year	001
Chromium, total [as Cr]	daily maximum	≤ 2.77 mg/L	all year	001
Chromium, total [as Cr]	monthly average	report only (lb/d)	all year	001
Chromium, total [as Cr]	daily maximum	report only (lb/d)	all year	001
Copper, total [as Cu]	monthly average	≤ .054 mg/L	all year	001
Copper, total [as Cu]	daily maximum	≤ .084 mg/L	all year	001
Copper, total [as Cu]	monthly average	≤ .13 lb/d	all year	001
Copper, total [as Cu]	daily maximum	≤ .2 lb/d	all year	001
Lead, total [as Pb]	monthly average	≤ .024 mg/L	all year	001
Lead, total [as Pb]	daily maximum	≤ .038 mg/L	all year	001
Lead, total [as Pb]	monthly average	≤ .059 lb/d	all year	001
Lead, total [as Pb]	daily maximum	≤ .092 lb/d	all year	001
Nickel, total [as Ni]	monthly average	≤ .3 mg/L	all year	001
Nickel, total [as Ni]	daily maximum	≤ .469 mg/L	all year	001
Nickel, total [as Ni]	monthly average	≤ .73 lb/d	all year	001
Nickel, total [as Ni]	daily maximum	≤ 1.13 lb/d	all year	001
Silver, total [as Ag]	monthly average	≤ .025 mg/L	all year	001
Silver, total [as Ag]	daily maximum	≤ .039 mg/L	all year	001
Silver, total [as Ag]	monthly average	≤ .061 lb/d	all year	001
Silver, total [as Ag]	daily maximum	≤ .094 lb/d	all year	001
Zinc, total [as Zn]	monthly average	≤ .443 mg/L	all year	001
Zinc, total [as Zn]	daily maximum	≤ .692 mg/L	all year	001
Zinc, total [as Zn]	monthly average	≤ 1.07 lb/d	all year	001
Zinc, total [as Zn]	daily maximum	≤ 1.67 lb/d	all year	001
Antimony, total [as Sb]	monthly average	report only (mg/L)	all year	001
Antimony, total [as Sb]	daily maximum	report only (mg/L)	all year	001
Antimony, total [as Sb]	monthly average	report only (lb/d)	all year	001
Antimony, total [as Sb]	daily maximum	report only (lb/d)	all year	001
Aluminum, total [as Al]	monthly average	≤ 1.57 mg/L	all year	001
Aluminum, total [as Al]	daily maximum	≤ 2.45 mg/L	all year	001
Aluminum, total [as Al]	monthly average	≤ 3.8 lb/d	all year	001
Aluminum, total [as Al]	daily maximum	≤ 5.92 lb/d	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
Phosphorus, Total	annual total	≤ 1765 lb	all year	001
Solids, total dissolved	monthly average	report only (mg/L)	all year	001
Solids, total dissolved	daily maximum	report only (mg/L)	all year	001
Solids, total dissolved	monthly average	report only (lb/d)	all year	001
Solids, total dissolved	daily maximum	report only (lb/d)	all year	001
Bromide [as Br]	monthly average	report only (mg/L)	all year	001
Bromide [as Br]	daily maximum	report only (mg/L)	all year	001
Bromide [as Br]	monthly average	report only (lb/d)	all year	001
Bromide [as Br]	daily maximum	report only (lb/d)	all year	001
Mercury, total [as Hg]	monthly average	≤ .0002 mg/L	all year	001
Mercury, total [as Hg]	daily maximum	≤ .0003 mg/L	all year	001
Mercury, total [as Hg]	monthly average	≤ .0004 lb/d	all year	001
Mercury, total [as Hg]	daily maximum	≤ .0006 lb/d	all year	001
Organics, total toxic [TTO]	daily maximum	≤ 2.13 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 20 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 40 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 48 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 97 lb/d	all year	001
Oxygen demand, chem. [high level] [COD]	semi-annual average	report only (mg/L)	all year	002
pH	semi-annual average	report only (SU)	all year	002
Solids, total suspended	semi-annual average	report only (mg/L)	all year	002
Nitrogen, Kjeldahl, total [as N]	semi-annual average	report only (mg/L)	all year	002
Nitrite + Nitrate total [as N]	semi-annual average	report only (mg/L)	all year	002
Phosphorus, total [as P]	semi-annual average	report only (mg/L)	all year	002
Iron, total [as Fe]	semi-annual average	report only (mg/L)	all year	002
Zinc, total [as Zn]	semi-annual average	report only (mg/L)	all year	002
Aluminum, total [as Al]	semi-annual average	report only (mg/L)	all year	002
BOD, carbonaceous [5 day, 20 C]	semi-annual average	report only (mg/L)	all year	002
Oxygen demand, chem. [high level] [COD]	semi-annual average	report only (mg/L)	all year	004
pH	semi-annual average	report only (SU)	all year	004
Solids, total suspended	semi-annual average	report only (mg/L)	all year	004
Nitrogen, Kjeldahl, total [as N]	semi-annual average	report only (mg/L)	all year	004
Nitrite + Nitrate total [as N]	semi-annual average	report only (mg/L)	all year	004
Phosphorus, total [as P]	semi-annual average	report only (mg/L)	all year	004
Cyanide, total [as CN]	annual average	report only (mg/L)	all year	004
Cadmium, total [as Cd]	annual average	report only (mg/L)	all year	004
Chromium, total [as Cr]	annual average	report only (mg/L)	all year	004
Copper, total [as Cu]	annual average	report only (mg/L)	all year	004
Iron, total [as Fe]	semi-annual average	report only (mg/L)	all year	004
Lead, total [as Pb]	annual average	report only (mg/L)	all year	004
Zinc, total [as Zn]	annual average	report only (mg/L)	all year	004
Aluminum, total [as Al]	semi-annual average	report only (mg/L)	all year	004
BOD, carbonaceous [5 day, 20 C]	semi-annual average	report only (mg/L)	all year	004
Oxygen demand, chem. [high level] [COD]	semi-annual average	report only (mg/L)	all year	005
pH	semi-annual average	report only (SU)	all year	005
Solids, total suspended	semi-annual average	report only (mg/L)	all year	005
Nitrogen, Kjeldahl, total [as N]	semi-annual average	report only (mg/L)	all year	005
Nitrite + Nitrate total [as N]	semi-annual average	report only (mg/L)	all year	005
Phosphorus, total [as P]	semi-annual average	report only (mg/L)	all year	005
Iron, total [as Fe]	semi-annual average	report only (mg/L)	all year	005
Zinc, total [as Zn]	semi-annual average	report only (mg/L)	all year	005
Aluminum, total [as Al]	semi-annual average	report only (mg/L)	all year	005
BOD, carbonaceous [5 day, 20 C]	semi-annual average	report only (mg/L)	all year	005

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/PA0010502 · MCP: https://passage-data.com/mcp