1. (a) Tanks shall be listed to approved standards and securely installed in a location to be removable for service, repair or replacement without the necessity of removing permanent, structural, mechanical or electrical equipment.

2. (b) Minimum size of inlet connections shall be determined by the total number of fixtures to be connected to the tank.

   Toilet connections shall be 3-inch minimum pipe size and shall extend vertically. The inlet fitting shall not extend downward into the tank more than 1 ½ inches (38 mm). The toilet connection shall be designed to receive or conform to an approved shape closet flange of standard dimensions or other approved fitting.

3. (c) Body waste holding tank drain opening shall be a minimum 3-inch pipe size. Liquid waste holding tank drain opening shall be a minimum 1 ½ inch pipe size. Drain openings shall be located at the lowest point in the tank.

   A listed fullway valve shall be directly connected to the tank or installed in the drain pipe of the tank within 36 inches (915 mm) of the drain outlet.

4. (d) The tank shall be vented at the highest point in the top of the tank by one of the following methods:

   1. (1) A 1 ¼ inch minimum diameter individual vent pipe extending undiminished in size through the roof.
   2. (2) A wet vent serving as a drain provided the drain portion is increased one pipe size larger than the connected trap arm.

Waste holding tanks installed in plumbing systems shall comply with the following:

Note: Authority cited: Section 18020, Health and Safety Code. Reference: Section 18055, Health and Safety Code.

History

1. New section filed 12-7-79; effective thirtieth day thereafter (Register 79, No. 49).