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Separation of water and sewer

Discussion in 'Plumbing Codes' started by Joe Engel, Dec 7, 2018.

  1. Joe Engel

    Joe Engel Member

    Jun 16, 2011
    Likes Received:
    Running discussion with plumber,
    2012 IPC, 603.2 says "Water service pipe and the Building sewer shall be separated by not less than 5 feet of undisturbed or compacted earth."

    But 603.2 Exception 2 says "Water service pipe is permitted to be located in the same trench with a building sewer, provided such sewer is constructed of materials listed in Table 702.2."

    Table 702.2 UNDERGROUND BUILDING DRAINAGE AND VENT PIPE gives reference to all materials allowed to be used within the building footprint or building drain system.

    In my experience, we always separated the two outside the slab either by 5 foot or on a shelf in the same trench, 18" above the building sewer. Here is the deal... If a building drain meets code and you use the same material as in the slab outside the slab, then you should be able to run the water service in the same trench (his argument)... Opinions?
  2. HForester

    HForester Member

    Sep 21, 2015
    Likes Received:
    Correct. Don't we commonly lay building drain piping and water distribution piping in the same trench under a slab on grade foundation? If it is not in the same trench under a slab on grade foundation, we certainly don't pay much attention to separation between the two.
  3. jeffc

    jeffc Bronze Member

    Oct 23, 2009
    Likes Received:
    The 2015 Uniform Plumbing Code, Section 720, requires a separation only if the sewer pipe is not approved for use inside of a building. Not the IPC but close.
  4. Master Pipe

    Master Pipe Registered User

    Dec 5, 2018
    Likes Received:
    You can take different decision after situation.

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