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My house is 25 years old- have never had a flood and have 1 sump pit that drains two drain tiles the circle the foudation. The bottom of one of these tiles is about 9-10 in from the basement surface, the other about 12-13 inches. Recently it has been dry in Chicago and the water level in the sump is about 8 inches below the lowest drain tile.
The lawn sprinker guy shut down the sprinkler system for the year on wednesday and on thursday we started getting an awful odor from the sump pit that permeated our home. We checked all the other floor drains in the basement- filled them with water and mineral oil , but the ofdor continued. The only way I could get rid of it was shut off off the sump pump and backup pump and fill the sump pit with water ABOVE the drain tiles. I put the sump pump on to confirm and the next day it rained about an inch friday but I noted nothing came out of the drain tile excpe t an awful headache causing odor so I filled it up again. .
Is it a coincidence that the lawn sprinkler guy shut off the valves- any idea o finding the cause? I cannot keep the sump pit filled and the pumps off. Should I raise th sump pump so there is always a water seal in the drain tile. /