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When our crews are cleaning the sewer mains they are using high-pressure hoses that spray water in the sewer main. This can cause high air pressure or negative air pressure in the sewer main and sewer service lines that connect to the house plumbing. If a house does not have adequate sewer vents, which are usually vented through the roof, the excess air pressure can cause water to be blown out of the toilets or p-traps in the home. If your toilet is blown, please contact the equipment operator or call 509-477-1984.