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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 only a septic tank needs to be replaced â and the drain field is still undamaged â the cost will be in the order of about $2500 to $3500. If a whole new drain field, including the septic tank, is needed you should plan on spending $8000 to $10000 for a typical home.