(1) “Board” means the board of certification created in § 68-221-905;

(2) “Certificate” means a certificate of competency issued by the commissioner stating that the operator has met the requirements for the specified operator classification of the certification program;

(3) “Commissioner” means the commissioner of environment and conservation or the commissioner's duly authorized representative;

(4) “Operator” means a person who is in direct charge, or that by education, training and experience is qualified to be in direct charge, of a water treatment plant, wastewater treatment plant, water distribution system or wastewater collection system;

(5) “Wastewater collection system” means the entire system of pipes, valves, pumping stations and appurtenances through which wastewater is collected and conveyed to the wastewater treatment plant;

(6) “Wastewater treatment plant” means the facility or group of units provided for the treatment of wastewater, either or both domestic and industrial wastes. Industrial wastes which do not enter a public wastewater system are excluded;

(7) “Water distribution system” means that portion of the water supply system in which water is conveyed from the water treatment plant or other supply point to the premises of the consumer;

(8) “Water supply system” means the system of pipes, structures and facilities through which water is obtained, treated, and sold, distributed or otherwise offered to the public for household use or any use by humans, if such system has at least fifteen (15) service connections or regularly serves an average of at least twenty-five (25) individuals at least one hundred twenty (120) days or at least sixty (60) consecutive days out of the year. An industrial water system not delivering water for human consumption is excluded from this definition; and

(9) “Water treatment plant” means the portion of the water supply system which in some way alters the physical, chemical or bacteriological quality of the water.