Vitrified salt-glazed clay or well-made concrete sewer pipe and
cast-iron soil pipe are the standard materials for house sewers on
farms. Asphalt-impregnated fiber pipe, of a type designed especially
for house sewers, appears to be satisfactory for this purpose.
Cast-iron soil pipe with leaded joints should be used when the sewer is
within 50 feet of a well or suction line from a well, within 10 feet
of any drinking-water supply line under pressure, within 5 feet of
basement foundations, or when laid beneath driveways with less than 3
feet of earth covering the pipes. When within 15 feet of large trees or
shrubs, the sewers should have root-tight joints.