Dishwasher Drain to Disposal Req'd?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by whizmo, Aug 10, 2005.

  1. whizmo

    whizmo New Member

    Messages:
    2
    Hi, while doing a minor kitchen remodel with new sinks and faucets, I discovered the our ten-year-old house was originally plumbed with the waste line from the dishwasher draining directly to the sink waste line (through an air gap) rather than going through a garbage disposal that sits right next to the dishwasher. (The disposal's dishwasher inlet knockout plugs are are still intact, so it's been this way since the house was built.)

    Is this Okay? It's been fine for ten years and I know that if there is no disposal, then this is acceptable, but I'm seeing some reports that a connection to a disposal, if one exists, is required by code and highly recommended.

    I'm in the Seattle area, BTW.

    Thanks
    Last edited: Aug 10, 2005
  2. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,395
    Location:
    Yakima WA
    Boy, I sure hope it's OK. I don't have a garbage disposal in my house and the DW goes into a tailpiece above the sink trap. Don't have a airgap either, just looped the hose under the countertop.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,416
    Location:
    Bothell, Washington
    The dishwasher doesn't need to drain to the disposer.
  4. ok but better to

    Its ok, and either way works....

    more a matter of convienance to have
    an easy place to install that dw into

    Though I have always felt that through
    the garbage disposal any large residue
    that might be on the dishes would get a
    little better groundup ....before going down the drain...


    whatever
  5. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Here we almost always see it connected to the disposal, although I don't believe code requires that. The drawback is, if a person tends to leave a lot of food scraps on the plates as they go to the DW, enough stuff in the waste water can clog the grind chamber in the disposer. I had to "train" the misses to try to remember to cycle the disposer briefly after the first wash cycle in the DW.
  6. whizmo

    whizmo New Member

    Messages:
    2
    Thanks everyone. If I every rework the plumbing, I'll put it throught he disposal, but for now, I'll let it go and just be sure to scrape dishes well. Appreciate the advice.
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