Green Plumbing

Answer: D -While in general deeper is better when it comes to the water table and installing an on-site wastewater treatment system, the recommended depth varies based upon other site factors. One of the chief considerations is the percolation rate of the soil in which the drainfield is situated; where the rate is slower (e.g., three minutes per inch), the minimum depth to water table can be less because the waste is spending more time percolating through the soil and being cleaned. Where the rate is speedier, the waste needs to percolate through more soil and the necessary depth to water table is greater.