So I have a new build in Edmonton in a brand new suburb. Sump pump on left side and a backflow preventer on the opposite side of house (about 30 feet away).
Like a good home owner, I went and checked my backflow preventer to make sure it worked. When Opening up the cover I discovered water about 10 inches down from the floor (just underneath the foundation level). So much water that I couldn't get to the backflow preventer. I scooped out about 10 gallons of water but it would seep back in.
That was a year ago. The builder said it just needed to drain out. So this year I checked again....same issue, same amount of water.
Now they are telling me (and I quote the email)
"I have spoken with the weeping tile and the excavation crews. Both of them concurred with what one of the managers here suggested of why you have water in your back flow preventer area.
They all agreed that you must have a higher than usual water table in your neighborhood. This water flows in the soil under your foundation and weeping tile. This water enters through the trench that was made to allow the sewer pipe to exit your home. The soil in the area of the trench is not compacted, that could damage sewer line but also allowing the water to move freely.
This is why the water height never changes, never too high (as it will enter the weeping tile) and always refills. The surrounding soil in the area of your foundation will not be affected as it has never been disturbed.
There is no repair for this situation, so my suggestion is to seal a piece a plastic over the back flow preventer to prevent humidity ascending through your carpet. Place your painted steel plate back on the area and I will have the carpet company contact you to set a date and time to re-install the carpet."
My neighbor's house/backflow not 20 feet from my home is bone dry....Call me crazy , but they haven't dug a hole to see where the water table is...
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