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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.
If youâre interested in costs because your current septic system has failed, then there are even more factors to consider. The EPA states an average cost of $1,200 to $2,500 to revitalize a failed drain field, but a complete removal and replacement can range from $6,000 to as much as $25,000!