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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.
A cluster system, where each home has their own septic tank but empty into a community drainfield will generally cost $5,000 to $8,000 for the initial install. Engineered systems, like mounds, sand/peat filters, aerobic systems and constructed wetlands will run $6,000 to $10,000.he typical total cost for a new septic system over a 20 year period is $6,300 to $13,000 for trenches and mounds, or $13,500 to $32,000 for alternative treatment systems.