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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.
Because each home's leach field and septic system is different, pricing a leach field replacement is done on a case-by-case basis. As a ballpark, a backhoe operator can excavate about 9.5 linear feet of soil per hour to dig a new leach pit, while a typical installer can install about 12 feet of leach line per hour.