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Generally a small tank leak, some soil, testing, reporting ect can run up to the $5,000.00 range. Costs can incrementally increase by thousands of dollars based on the increase in soil removal (contaminated soil) and replacement (clean fill). Could you spend $7000.00, $10,000.00 or more, yes, if the tank leak is big enough to require that expense.
Typical costs: 1  Do-it-yourself replacement of a leaking toilet shutoff valve typically costs $10-$25 for new parts; requires no special tools or skills; and usually takes 1-2 hours. Broken or failing parts inside the tank (like a fill valve, flapper, ball cock or tank lever) may cause a toilet to run continuously. DIY replacement parts for this problem typically cost $5-$50 depending on the brand of toilet, with an average cost of less than $25. This project might take 20-30 minutes or two hours.