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I almost spent $150 on a plumber who would have tightened one valve. Here is what I checked first — took about 12 minutes and cost nothing.
According to the EPA, the average household leak wastes over 9,300 gallons of water a year, and a worn-out flapper is the most common culprit. With a $7–$12 universal flapper and 10 minutes, you can fix it yourself and skip the $150 plumber visit.