HAR §4-157-19. Cross-connections

(a) No cross-connections shall be made without the written consent of the department. (b) The department requires the installation of a mechanical or any other methods or devices on the consumer's side of the meter to prevent backflow on all new services at the sole cost and expense of the consumer. (c) Whenever the consumer maintains a separate pressure system or separate storage facility, or in any way increases the pressure of the water within the premises above the pressure furnished by the department, or has the equipment, devices, or arrangement of piping, storage, or industrial methods or processes that might, under certain circumstances, raise the pressure of the water within the premises above the pressure of the water in the mains of the department, a backflow prevention device shall be specified and approved by the administrator-chief engineer for installation at the sole cost and expense of the consumer. (d) As a protection to the consumer's water system, a suitable pressure relief valve shall be installed and maintained at the consumer's expense when backflow devices are installed on the consumer's side of the meter. (e) Any device installed for the prevention of backflow as may be required under these rules shall, unless the department approves otherwise in writing, be located above ground and in a manner safe from flooding or submergence in water or other liquid, properly protected from external damage, freely accessible, and with adequate working room for inspections, testing, and repairing. 157-20