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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 cost of septic system replacement depends on the type of system installed. Here are the average ranges: 1  Gravity fed drainfields of all types: $5,000 to $10,000, or an average of $7,500.2  Mounds: $10,000 to $50,000, or an average of $30,000.he cost of septic system replacement depends on the type of system installed. Here are the average ranges: 1  Gravity fed drainfields of all types: $5,000 to $10,000, or an average of $7,500.