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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.
Drain field repairs costs can range from a few hundred dollars for small repairs to several thousands of dollars for total septic tank and drain field replacement. The cost associated with septic tank and drain field repair can be determined by several factors. Leading the way would be determined by the state you live in.