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P-305.4 Freezing. Water, soil and waste pipes shall not be installed outside of a building, in attics or crawl spaces, concealed in outside walls, or in any other place subjected to freezing temperatures unless adequate provision is made to protect such pipes from freezing by insulation or heat or both. Exterior water supply and water distribution system piping shall be installed not less than 36" minimum below grade to the top of the pipe. 6 inches (152 mm) below the frost line and not less than 12 inches (305 mm) below grade. Where water distribution pipe and water service pipe connect at the curb or curb stop, the piping shall be a minimum of 48" below grade to the top of the pipe.
P-305.4.1 Sewer depth. Building sewers that connect to private sewage disposal systems shall be installed not less than [NUMBER] 36 inches (914 mm) below finished grade to the top of the pipe at the point of septic tank connection. Building sewers shall be installed not less than [NUMBER] 36 inches (914 mm) below grade to the top of pipe.
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