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The cost for a new drainfield can vary a great deal depending on the amount of bedrooms in the house and the soils in the area. An average mound will cost around $23,000-$30,000, while a gravity trench system will average about $18,000.
Maintenance inspections do not include soil borings and therefore will not identify systems that are too close to the water table or bedrock. However, a maintenance inspection may detect a system that is surface discharging or one that includes a cesspool or seepage pit. Systems that are found to be an imminent threat to public health will be required to be repaired or replaced within ten months.