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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.
What is a leach field? A leach field is commonly know as a drain field which is a portion of area that is attached to a septic tank for an individual home. The main purpose of the leach field is to disperse liquids from the septic tank in the an area of soil by means of drains which eventually gets spread out in the large area known as the leach field.