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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.
Discounts: 1  Most counties and states require a building permit for installing or replacing a septic system, at a cost of $250-$1,000 or more depending on the location and the complexity of the project. 2  Check with your local building/planning department for details.ype: treating the leach field. I had a septic company come to do a septic tank pump for $150 but they said I needed a more expensive leach field treatment at a cost of over $2500 even thought there is no back up or smell anywhere.