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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.
Mark Kent, WA. I would expect a leach field to last more like 40 years, not 20. Pumping the tank is not solving the problem. You need to check your output pipe baffle to make sure it still exists (all septic pumpers should do this, and spend the $50 extra to replace it if there is any question).f the leach field has become totally clogged or is not not porous enough anymore to take the water, then you'll need a new one. Costs can be all over the place depending on whether you can do a repair or need a whole new permitted system.