18-29-605.4 Water service pipe.
   Water service pipe shall conform to NSF 61 and to one of the standards listed in Table 18-29-605.4. All water service pipe or tubing, installed underground and outside of the structure, shall have a minimum working pressure rating of 160 psi (1100 kPa) at 73.45°F (23.03°C). Where the water pressure exceeds 160 psi (1100 kPa), piping material shall have a minimum rated working pressure equal to the highest available pressure. All ductile iron water pipe shall be cement mortar lined in accordance with AWWA C104.
Table 18-29-605.4
Water Service Pipe
 
Material
Standard
Copper or copper-alloy tubing (Type K)
ASTM B75; ASTM B88; ASTM B251; ASTM B447
Ductile iron water pipe
AWWA C151; AWWA C115