Septic Tank sizes AND dimensions:


(I = "invert" - the distance measured from the bottom of the tank to the bottom of the inlet.  W = width.  L = length.  TH = total height of the tank, including standard 4" thick cover)


  • 500 gallon  1 piece:  I = 4', W = 4'5", L = 5'8", TH = 4'11.5""
  • 1000 gallon 1 piece:  I = 4,' W = 5'8", L = 8'2", TH = 5'
  • 1000 gallon 1 piece low profile:  I = 3'5", W = 5'8", L = 8'2", TH = 4'4"
  • 1000 gallon 2 piece:  I = 5', W = 5'4", L = 8'4", TH = 6'
  • 1250 gallon 1 piece low profile:  I = 3'5", W = 5'8", L = 12'3", TH = 4'4"
  • 1250 gallon 2 piece:  I = 5', W = 4'11", L = 9'3", TH = 6'
  • 1500 gallon 1 piece:  I = 4', W = 5'8", L = 12'3", TH = 5'
  • 1500 gallon 2 piece:  I = 5'1", W = 7', L = 9', TH = 6'
  • 2000 gallon 2 piece:  I = 5', W = 7', L = 12'9", TH = 5'10"
  • 3000 gallon 3 piece:  I = 7'4", W = 7', L = 12'9", TH = 8'3"