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  1. #1
    Jon mackay's Avatar
    Jon mackay Guest

    Default Toilet drain line size

    Is there a minimum size for a toilet waste line?

    I came across a 3" cast iron line from a toilet and it just didn't look right.

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  2. #2
    Join Date
    Jul 2008
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    Snowbird (this means I'm retired and migrate between locations), FL/MI
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    4,086

    Default Re: Toilet drain line size

    Why don't you go ahead and access the New York State Residential Codes?


  3. #3
    Join Date
    Apr 2007
    Location
    state of jefferson
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    Default Re: Toilet drain line size

    3" is the minimum size for A toilet.


  4. #4
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Toilet drain line size

    Quote Originally Posted by H.G. Watson, Sr. View Post
    Why don't you go ahead and access the New York State Residential Codes?
    Is there a link to that?


  5. #5
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Toilet drain line size

    This was a small commercial office that has a history of the toilet backing up. When I saw the 3" I just thought I would throw it to the forum as all the residential toilet lines I find are 4".


  6. #6
    Join Date
    Nov 2007
    Location
    Chicago
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    548

    Default Re: Toilet drain line size

    THe Picture is from the New York State Code. Look at the foot note (a.) it states the minimum size of any buidling drain serving a water closet shall be 3" Here is a link to the state plumbing code 2006 New York State Plumbing Code

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