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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.
Septic tank problems cause and lead to drain field problems. The drain field is where the waste water goes after it leaves the septic tank, also called leachfield or disposal field.It can also go to a mound, a seepage bed, or a seepage pit.The general and more technical term for all these methods of handling the wastewater from the tank is the soil absorption system.eptic tank problems cause and lead to drain field problems. The drain field is where the waste water goes after it leaves the septic tank, also called leachfield or disposal field.