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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.
1 Pumping out larger tanks (1,500-2,500 gallons) can cost $200-$350 or more. 2  Installing a high-quality filter to protect your leachfield/drainfield costs about $200-$300, according to officials in Olympia, Washington. Pumping out larger tanks (1,500-2,500 gallons) can cost $200-$350 or more. 2  Installing a high-quality filter to protect your leachfield/drainfield costs about $200-$300, according to officials in Olympia, Washington.