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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.
Less extreme toilet leaks will still run your monthly water bill much higher than the norm; a moderate leak, at 6,000 gallons per month (thatâs right, 6,000 is moderate), will cost you around $70 extra each month, which comes up close to $1,000 per year.