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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.
leach field the fewer bacteria you will have present there, and bacteria is what will open the clogged. parts of your leach field to restore flow. Steps you can take to help your septic system recover.1  Use a septic tank treatment regularly to eat away the clogs in your leach field. 2  Please see our CHEMICALS page.ee an animation of the septic tank leach field process here. When a septic tank backs up into your house, damage to the leach field is already done. 1  The sludge layer has overflowed the baffle in the tank. 2  That sludge has run into the leach field.