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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.
potential risk of nitrate leaching maybe higher. Assessing Leaching Potential and Leaching Index Rating. In order to assess the potential for nitrate nitrogen to leach from a field, follow the four-step. process outlined below: Step 1: Identify the dominant soil map unit in the field.