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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.
Occasionally they can run in the $15,000 dollar range or more. Maintenance Costs: The typical annual costs of a new septic system drainfield or mound system range from $30 up to $500 with the high end including replacement costs of pumps in mound systems.ccasionally they can run in the $15,000 dollar range or more. Maintenance Costs: The typical annual costs of a new septic system drainfield or mound system range from $30 up to $500 with the high end including replacement costs of pumps in mound systems.