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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.
PVC piping for the leech field and between your house and the septic tank can run as much as $200 depending on the distance of the tank from your house. Installing the PVC plumbing to the septic tank, leech field, and exhaust pipe can cost as much as $1,000 but typically costs $400 to $600. Other costs might include:1  Tree and root removal may run over $1,000 if they interfere with the septic system design.igging 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.