Check with the local building and fire departments for details. Sewer Some rural parcels can connect to public or community sewer systems. The water is then distributed through buried perforated pipe into level trenches filled with drain rock. The leachfield trenches cover an area ranging from about 3000-10,000 square feet, depending on the soil capabilities. The leachfield area should be kept devoid of trees and brush so that the roots won't interfere with the drain.
Nothing varies more between parcels than the ability to support septic systems.
Most environmental health departments require percolation and soil mantle tests prior to the issuance of a sewage disposal permit. If they don't, have the tests done anyway as a condition of your closing escrow. Parcels with numerous rock outcrops, swampy areas, water courses or ditches, and sparse trees and vegetation may be particularly suspect. A soils mantle test is usually one or more backhoe pits dug at least eight feet deep and observed by a civil engineer, geologist, or environmental health specialist. The soil can't have ground water or shallow bed rock.