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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.
The Infiltrator chamber septic system leach field differs from conventional leach fields, which use perforated plastic pipes laid in a twelve inch gravel bed. It is not a stretch of the imagination to envision those small holes clogging faster than a three foot wide chamber.