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1 Broken or failing parts inside the tank (like a fill valve, flapper, ball cock or tank lever) may cause a toilet to run continuously. 2  DIY replacement parts for this problem typically cost $5-$50 depending on the brand of toilet, with an average cost of less than $25. 3  This project might take 20-30 minutes or two hours.
A constantly running toilet is testing your sanity. THE QUICK FIX. The problem is most likely the flapper valve not sealing properly. First, make sure that nothing--such as a brick to raise the water level or a toilet-bowl cleaner dispenser--is blocking the valve from closing properly.