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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.
Digging up the septic tank to reach a leak may cost $2,000 to $4,000. Some leaks can be repaired; some cannot. A typical leak that can be repaired will cost $100 to $500. Repairs to a leach field â if the absorbency of the field has failed â may cost upwards of $2,000 from start to finish.ost septic tanks cost between $400 and $2,000 depending on the type of material and the size of the tank. A 500 gallon steel tank will be cheapest, while a 2,500 gallon plastic composite tank will be the most expensive.