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In localities having a winter design temperature of 32°F (0°C) or lower as shown in Table R301.2 of this code, a water, soil or waste pipe shall not be installed outside of a building, in exterior walls, in attics or crawl spaces, or in any other place subjected to freezing temperature unless adequate provision is made to protect it from freezing by insulation or heat or both. Water service pipe shall be installed not less than 12 inches (305 mm) deep and not less than 6 inches (152 mm) below the frost line.
P2603.5.1 Sewer Depth
Building sewers that connect to private sewage disposal systems shall be not less than [NUMBER] inches (mm) below finished grade at the point of septic tank connection. Building sewers shall be not less than [NUMBER] inches (mm) below grade.

Related Code Sections

305.4 General Regulations, Freezing
place subjected to freezing temperatures unless adequate provision is made to protect such pipes from freezing by insulation or heat or both. Exterior ...
P2603.5 General Plumbing Requirements, Freezing
not be installed outside of a building, in exterior walls, in attics or crawl spaces, or in any other place subjected to freezing temperature unless ...
P2603.5 General Plumbing Requirements, Freezing
not be installed outside of a building, in exterior walls, in attics or crawl spaces, or in any other place subjected to freezing temperature unless ...
1301.8 Nonpotable Water Systems, Freeze Protection
Where sustained freezing temperatures occur, provisions shall be made to keep storage tanks and the related piping from freezing ...
5303.3.5 Compressed Gases, Freeze Protection
Pressure relief devices or vent piping shall be designed or located so that moisture cannot collect and freeze in a manner that would interfere ...