rain question

Discussion in 'Septic Tanks' started by robertbarnes, Jan 14, 2019.

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  1. Jan 14, 2019 #1

    robertbarnes

    robertbarnes

    robertbarnes

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    If a septic tank is pumped out and the house is empty and it rains for a day or two, should the tank fill back up with water from the field lines? Or should it remain empty until the sinks and toilets are used in the house? If it does the opposite of what it is suppose to do would that be due to bad field line?
     
  2. Jan 14, 2019 #2

    Diehard

    Diehard

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    https://inspectapedia.com/septic/Septic_Tank_Flooding.php

    Not all systems are the same. Some are pumped some go by gravity.
    Ideally the tank should not fill back up if it rains for 2 days but it can happen.
    I don't think they typically put a back water valve on the tanks outlet pipe, which would help prevent it.

    If it does the opposite of what it is suppose to do, it could be a number of reasons.

    Googling various article would probably help answer your question.
     
  3. Jan 15, 2019 #3

    robertbarnes

    robertbarnes

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    Thank you for the reply and the great link. I am reading through that information. I am in the middle of buying a foreclosed home and when I had the septic tank drained and inspected it was found that the one of the lids were half way put on and it had been raining for over 5 days. when he pumped it he noticed what he said were black level lines that indicated that the septic tank had sat at different levels. The house is vacant and I have no clue how long it has sat empty. But the guy who pumped it out said that he could not say for sure if the system was good or bad. So I have a few days left to make a decision and was going to go back over there and look at the septic tank and see if it has filled back up or not. I think it is a 1500 gallon gravity fed system. The reason I asked about the water draining back into it is because since the inspection and him pumping it out there has been a few days of sunshine and now a couple days of rain. was just wondering what to expect when i look in the tank, should it be half full of rain water or what?
     
  4. Jan 15, 2019 #4

    SHEPLMBR

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    Your lid should never be buried (lid to tank). Risers and lids should be above ground for that reason. Do you have a concrete tank?
     
  5. Jan 15, 2019 #5

    Diehard

    Diehard

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    There's no telling what to expect.
    I would require the seller provide at least a 6 month warranty that the system is functioning.
    In my state it is typically required that the the septic system be inspected and approved or a new system be installed prior to the sale of the property. For us, it's a $20 to $30,000 potential cost for a new system.
     
  6. Jan 15, 2019 #6

    frodo

    frodo

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    You should see a layer of crust, with the water below that layer

    septic tank.jpg
     
  7. Jan 16, 2019 #7

    robertbarnes

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    yes it is a concrete tank. it has risers on it and the lids are about 3 inches underground. the guy said they people who installed it must have done it for the looks.
     
  8. Jan 16, 2019 #8

    robertbarnes

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    this is a foreclosure and sold as is. but i did have a second opinion and they said it is good to go and are giving me a written letter stating that.
     
  9. Jan 16, 2019 #9

    robertbarnes

    robertbarnes

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    the tank was pumped out and the home is sitting empty with the water cut off. So when I looked in there there was a little water in the bottom but not even close to being filled up.
     
  10. Jan 16, 2019 #10

    SHEPLMBR

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    They may have done it for looks but it creates a problem.
     
  11. Jan 16, 2019 #11

    Diehard

    Diehard

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    It definitely can create a problem if there is a ground water problem and/or poor runoff for storm water.
    My tank top and lid are about 3 feet below grade. Bought the house 42 years ago. For convenience of access ,for pumping every few years, I built a pressure treated wood access box. lid is still in tank top and box just sits on tank. Never any signs of on water on tank top.
    Not the best design but not uncommon to have buried access in my area.
     
  12. Jan 16, 2019 #12

    frodo

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