In this chapter,
(1) “certificate” means certificate of competency issued by the department stating that the operator has met the requirements for the specified operator classification of the certification program;
(2) “department” means the Department of Environmental Conservation;
(3) “potable 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;
(4) “wastewater system” means the system of pipes, structures, equipment and processes required to collect, carry away, and treat domestic and industrial wastewater and dispose of the effluent.