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Thread: Steps on adding a water storage tank to existing well?

  1. #1

    Default Steps on adding a water storage tank to existing well?

    I am thinking about adding a 1500+ poly water tank so my existing well/pump can pump into it. I hear the pump will not have to kick on and off so it will save the life of the pump. I am trying to find a link/article on how to do it myself. I hear you have to install a booster pump from the water tank to the pressure tank and route the existing well pump to the water storage tank. I am not sure what type of float system I need to put in the water storage tank and at what level do I set it at. I currently have a 1hp pump in my well and it pumps 10gallons per minute.


  2. #2
    In the Trades Bob NH's Avatar
    Join Date
    Oct 2005
    New Hampshire


    You need two float switches in the poly tank.

    There will be a Normally Closed switch (closed when hanging down) near the top of the tank that will control the well pump.

    There will be a Normally Open switch (open when hanging down) near the bottom of the tank that will protect the pressure-tank pump if the poly tank runs low on water.

    I usually have the switches operate definite purpose contactors (big relays) to run the motors. I mount the contactors in a small pull box, such as an 8"x8"x4" box.

    I get the switches from USA Bluebook in Chicago, and the contactors from Grainger.

    You have several choices for the second pump. You can put a submersible in the tank, or use a multistage centrifugal booster pump, or a shallow well jet pump. The submersible is most efficient, the booster next, and the jet the least efficient. Power cost is usually not an big factor in that application.

    You should decide if the existing 10 GPM is adequate, and determine at what pressure you want to operate the pressure tank. Then select the pump.

    If you ever need to replace the well pump you can select one with a little less pressure capability because you are not pumping to a pressure tank.

    There is always a risk of contamination in a non-pressurized tank. You will want to watch for algae growth and add a little chlorine (laundry bleach) if necessary to keep it controlled.

  3. #3
    Moderator valveman's Avatar
    Join Date
    Mar 2006
    Lubbock, Texas


    The only reason to use a storage tank is if you have a low producing well. If your well will make plenty of water, you are just adding expense and complications to your system by using a storage tank and booster pump. You are correct that reducing the on and off cycles will make your pump system last longer. However, there are much easier ways to accomplish this task.

    See these links;




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