Hawaii Administrative Rules
Title 6 - DEPARTMENT OF BUDGET AND FINANCE
Division - PUBLIC UTILITIES COMMISSION
Chapter 77 - TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE; MINIMUM SAFETY STANDARDS
Subchapter 10 - CUSTOMER METERS, SERVICE REGULATORS, AND SERVICE LINES
Section 6-77-117 - Service lines: cast iron and ductile iron

(a) Cast or ductile iron pipe less than six inches in diameter may not be installed for service lines.

(b) If cast iron pipe or ductile iron pipe is installed for use in a service line, the part of the service line which extends through the building wall must be of steel pipe.

(c) A cast iron or ductile iron service line may not be installed in unstable soil or under a building.