kitchen sink draining into dishwasher

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by CarolLee, Oct 26, 2009.

  1. CarolLee

    CarolLee New Member

    Messages:
    13
    Location:
    Missouri
    Hi,
    When I run water in the kitchen sink, it is somehow draining into the dishwasher. The dishwasher is backed up - couple of inches of standing water in the bottom - so if I run water in the sink, it overflows from the dishwasher onto the floor. I first noticed a puddle of water in front of the dishwasher this morning but hadn't run the dishwasher in a couple of days. Any ideas? Thanks.
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Dishwasher drain installed improperly. Until you get that fixed, avoid the problem by not filling the kitchen sinks, just run water as necessary and let it drain as you go, but do not fill up.

    [​IMG]
    Last edited by a moderator: Jan 28, 2011
  3. CarolLee

    CarolLee New Member

    Messages:
    13
    Location:
    Missouri
    Thanks for the reply. We have been in our home for 5.5 years w/o a problem like this. Is it still possible that the drain was installed improperly? Also, it is not draining at all. There is standing water in the dish washer and if I run the water for even a few seconds, it runs out of the dish washer where the door attaches at the bottom. Thanks.
  4. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Messages:
    1,143
    Location:
    South*East
    Your kitchen drain is stopped up.

    John
  5. CarolLee

    CarolLee New Member

    Messages:
    13
    Location:
    Missouri
    So it needs to be snaked?
  6. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Messages:
    1,143
    Location:
    South*East
    Yes, and the DW drain should at least be looped up as high as possible under the sink.

    John
  7. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    And should be (though not required by all codes) equipped with an air-gap.
  8. ChuckS

    ChuckS New Member

    Messages:
    96
    Location:
    Aurora, CO
    What is an air gap?

    Is that part of the disposer?
  9. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    [​IMG]

    Keeps stuff from backwashing into your dishwasher. Of course it creates a little bit of a mess though. The idea is so you don't get backwash without knowing what happened and then using the dishes thinking they're clean.
  10. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Holy huge pic batman. Sorry 'bout that. :cool:
  11. CarolLee

    CarolLee New Member

    Messages:
    13
    Location:
    Missouri
    Are the air gap and the coiled drain new developments? I've never seen an air gap. Our house was built about 6 -7 years ago and they did not coil the drain. It is, however, attached to the highest point possible on the garbage disposal.

    Thanks for all the help. Even though I can't take care of this myself, it is nice to know I can't take care of it myself before I make that call. :)
  12. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Like I said, it's not code everywhere, but it is a good idea to have one. I'll admit I don't, but I know I should.
  13. Kubismo

    Kubismo New Member

    Messages:
    6
    Location:
    Vancouver, BC
    Regarding the air gap - how come it can't be under the counter but high up in the cabinet? Why does it need to be above the counter? It's hard to install post hoc given that I'd have to drill a hole in the granite counter...
  14. Terry

    Terry Administrator Staff Member

    Messages:
    15,298
    Location:
    Bothell, Washington
    It's called an "Air Gap" because it breaks the siphon action.

    If you use a hose to siphon a wading pond, the moment you lift the hose out of the water the siphon stops. The same thing applies here.
    The gap needs to be above the flood level of the sink.
    O course you can put it below the counter, and the first time someone fills up the kitchen sink, it's going to leak inside your brand new cabinets because you've placed it below the flood level of the sink.
    If you don't put a hole in the counter, you would be better off to not have the air gap, but to high loop the hose from the dishwasher before connecting to your plumbing or disposer.
    You don't want a "Gap" in the drain below the counter.
    A gap means an opportunity for a big gushing leak from the dishwasher.

    Standard plumbing practice requires an air gap at many fixtures.
    Your tub, lav and sinks all have at least a 1" gap between the end of the faucet and the flood level. That way a plugged sink can't backup into the fresh water supply.

    An air gap is intended to prevent the goo from the kitchen sink from entering your dish washer.
    It's about sanitation.
    Last edited: Mar 10, 2011
Similar Threads: kitchen sink
Forum Title Date
Plumbing Forum, Professional & DIY Advice Removing the water supply line on a kitchen sink Nov 16, 2014
Plumbing Forum, Professional & DIY Advice Are kitchen sink "tailpieces" standard Nov 1, 2014
Plumbing Forum, Professional & DIY Advice Kitchen Sink Drain Oct 13, 2014
Plumbing Forum, Professional & DIY Advice Water bubble out from concrete slab surface when the downhill 12-foot far away kitchen sink is dra Sep 25, 2014
Plumbing Forum, Professional & DIY Advice Please help me identify kitchen sink issue Sep 10, 2014

Share This Page