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Replacement Costs. Although costs vary according to the size of the leach field, soils and costs of local permits, expect to pay between $5,000 and $20,000 for leach field replacement.It is the most expensive component of the septic system.eplacement Costs. Although costs vary according to the size of the leach field, soils and costs of local permits, expect to pay between $5,000 and $20,000 for leach field replacement.
The following are estimates for a drain field repair: ( 1 between 10 & 15 USD) supply pipes, replacement with copper. ( 2 between 25 & 50 USD) installation of shut-off valve. ( 3 between 1 & 3 USD ) insulation of supply piping. ( between 1,200 & 2,500 USD) repairs for drain 1  field. [between 75 & 125 USD] repairs for ordinary leaks.