Administrative Rules of Montana
Department 17 - ENVIRONMENTAL QUALITY
Chapter 17.38 - PUBLIC WATER AND SEWAGE SYSTEM REQUIREMENTS
Subchapter 17.38.5 - Water Hauled for Cisterns
Rule 17.38.512 - FILLING POINTS

(1) Filling points must be constructed in order to protect against contamination of the filling pipe or hose when not in use. They must also be protected during the tank filling operation to prevent contamination of either the water being piped into the tank or water in the public water supply system.

(2) There must be no direct connection between the hose or pipe on the public water supply and the hauling tank itself. An air gap must be provided or an adequate back flow prevention device must be installed on the filler pipe.