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Thread: Whole house, back splash issue

  1. #1
    DIY Junior Member sciarrino's Avatar
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    Question Whole house, back splash issue

    I'm new to this forum and am a homeowner, so sorry if there is a better place I should be posting this. My question is not so much a question but wondering what my issues could be; I am occasionally getting water coming out of the trap where our washer exhaust is. I have a sump pump after the washer and it seems like when the sump pump goes off it pushes water back out of that washer trap (seem my diagram here). I can't say it's always started by the sump pump because I initially suspected it was from too much water consumption in the upper floor. The washer and sump pump are in the basement and the main goes out right after the sump pump. Could it be that my cesspool is full? I had it drained 2-3 years ago but now my boys are older and taking long showers (another issue altogether). Any thoughts/ideas? And the amount of water coming back can vary from a single splash back to a decent sized puddle. Thanks in advance for any help or info.
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    DIY Senior Member Reach4's Avatar
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    Raise the standpipe for the washer. http://www.terrylove.com/forums/show...ndry-standpipe post 7 says the standpipe should be between 18 and 30 inches from the P-trap. I suspect yours is less.

    If you want a technique, you might want to post a picture or describe your washer standpipe.

  3. #3
    DIY Junior Member sciarrino's Avatar
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    Thanks. Yes, the standpipe is definitely less than 18 inches. I will extend it to the highest that the washer hose will allow me (up to 30". What could be the reason why this has only started happening in the past few months?

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    Forum Admin, Expert Plumber Terry's Avatar
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    Does the washer have a p-trap, and is that vented?
    A pumped line can back pressure a drain.

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    DIY Junior Member sciarrino's Avatar
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    It doesn't appear to have a p trap, at least based on what is visible, which is just a flex hose and I put into the standpipe. I'm not a plumber by any stretch but wondered if putting some kind of 45 degree angle in the middle of the standpipe (like below) would help keep water from splashing out.

    l
    \
    l

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    DIY Senior Member Reach4's Avatar
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    Quote Originally Posted by sciarrino View Post
    I'm new to this forum and am a homeowner, so sorry if there is a better place I should be posting this. My question is not so much a question but wondering what my issues could be; I am occasionally getting water coming out of the trap where our washer exhaust is. I have a sump pump after the washer and it seems like when the sump pump goes off it pushes water back out of that washer trap (seem my diagram here). I can't say it's always started by the sump pump because I initially suspected it was from too much water consumption in the upper floor.
    After further thinking, septic, basement... Hmmm. Unless your septic system is down hill, I am having trouble with the concept that your sump pump is pumping into the same pipe that your washing machine is.

    OK... I expect that you have a septic tank. I suspect that you have a pump in a basement pit. The pit accepts the water from the washer, laundry tub, and floor drains, and is pumping that into the septic system.

    If you have a toilet or shower, (and probably other cases) that pit should be sealed and vented with a vent pipe. Then the sewer ejector pump inside would pump into the septic tank periodically. Such a system should not be called a sump pump but rather a sewage ejector pump.

    It could also be that you have just the washer going into an non-sealed pit with a sump pump at the bottom. Then that is pumping into the septic system. The problem with that is that your floor drains and foundation perimeter drains probably go into that same pit. You are putting a lot of extra water into your septic unless your area is very dry or you are on a hill. Sometimes those systems get retrofit with a manual valve that dumps water outside usually, but to the septic system when doing laundry.

    You should probably figure out what you have, although you may decide not to change what works. Do you have a sump pump *and* a sewer ejector pump? That would be the most probable condition to go along with your symptoms

    Quote Originally Posted by sciarrino View Post
    The washer and sump pump are in the basement and the main goes out right after the sump pump. Could it be that my cesspool is full? I had it drained 2-3 years ago but now my boys are older and taking long showers (another issue altogether). Any thoughts/ideas? And the amount of water coming back can vary from a single splash back to a decent sized puddle. Thanks in advance for any help or info.
    Anyway, I suggest getting your septic tank pumped again. Ask the worker how long he thinks you should go between pumpings after he has done the pumping. I suggest looking for a local owner-operator for good work and very good suggestions as a bonus. He will probably know what the typical sizes of septic tanks for your kind of house in your neighborhood. He will know how full you were. $200 (make that $300 for the LI cost of living) is still worthwhile for the peace of mind and the education. If you pump it a year too early, that only cost you an extra $100 maybe. If you already needed pumping, that will save you big bucks.

    I am not a pro. I do have a septic system and a basement.

    Edit: http://www.terrylove.com/forums/show...dpipe-pls-help Use of an AAV may not be allowed in your area, but it would definitely be better than what you have.
    Last edited by Reach4; 12-09-2013 at 10:44 AM.

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    DIY Junior Member sciarrino's Avatar
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    Hi reach4, sorry for the confusion. What I am calling a sump pump in my diagram is a sewer ejector pump. That sever ejector is below ground level and sealed with a vent to the outdoors. The consensus among friends on Facebook is that I need the tank pumped out. If it were the case that the tank was full, would it still continue to drain, if even slowly? It has been a little over a month that this back splashing has happened on occasion, and it's a little more frequent now.

    Thanks again for all of the input guys.

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    DIY Junior Member sciarrino's Avatar
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    Hi All, just wanted to follow up and close this out. As some had led me to expect, the cesspool was full and that trap for the washing machine was my lowest opening in the system. The pressure from the sewer ejector pump was causing the already filled pipes to come back through that trap and into the house. All is better now. Thanks again, and happy holidays!

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