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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 Sometimes a failing septic system can be resurrected by properly pumping the tank, cleaning the drainfield lines, installing filters and a process known as fracturing the soil, which involves inserting a hollow tube into the ground and injecting a 300-pound blast of air, at a cost of $1,000-$2,000 or more. 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.