The cost to fix a leaking toilet depends entirely on the source of the leak. Replacing a worn-out tank flapper or fill valve typically costs $15 to $35 in retail parts (or $100 to $250 if hiring a plumber). Fixing a leaking wax ring seal at the base costs less than $10 in materials for a DIY repair, while hiring a professional plumber for a wax ring replacement generally ranges from $125 to $250. Verification: Test the repaired toilet with multiple consecutive flush cycles to confirm zero water leakage.
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