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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.
Save. Building a septic drain field is time-consuming but pays off in the long run. Septic tanks last from 15 to 30 years. Unfortunately, drain fields, also known as leach fields, do not last that long. If placed in an area with good ground absorption, a drain field can last up to 10 years.lace the perforated pipe into the trench on top of the gravel and, using a clamp, attach the pipe to the septic tank drain. Place another half-inch of gravel on top of the perforated pipe and some along the sides of the pipe. Place the thin cloth over the gravel to prevent loose dirt from getting into the rocks.