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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 a site for a septic system, leech field and all plumbing pipes sometimes run well over half of the cost of the total septic system. Expect to pay between $3,000 and $6,000 for this work alone depending on the size of the tank and the distance of the tank and field from the house.nstalling 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.