Waste Line to Septic Tank Inlet

Discussion in 'Plumbing Code Questions' started by Jazzman, Apr 24, 2020.

  1. Jazzman

    Jazzman Member

    Joined:
    Oct 14, 2015
    Location:
    Oregon City
    I just replaced rusted-out 300 gallon steel septic tank with a code compliant norwesco 1000 gallon tank. Because of size of tank and slope of property the inlet on tank is about 12” lower than on previous unit. Would it meet code to increase drop of inlet pipe to 45 degrees for last 3-4 feet of run? I could maintain 1/4” per foot for the first 20’ but would use 22-1/2 degree fittings to increase drop to get waste pipe into tank. Otherwise, I would have to excavate new trench from house to tank.

    Thanks!
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Most of the stuff I read sets a minimum slope of 1/8 inch per foot or 1/4 inch per foot. I did read one that said that if you want to go steeper, go down at 45 instead of 22.5.
     
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  4. Jazzman

    Jazzman Member

    Joined:
    Oct 14, 2015
    Location:
    Oregon City
    Hey thanks for your input!
     
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