If, after investigation, the Department determines that any water supply system, sewerage system, or refuse disposal system is a menace to health or comfort or is causing a nuisance, and that conditions cannot be improved sufficiently only by changing the method of operation, the Department may order the owner: To alter or extend the water supply system, sewerage system, or refuse disposal system; or To install a new water supply system, sewerage system, or refuse disposal system. An order under subsection (a) of this section shall state a reasonable date for completion of the work. The Secretary may authorize a health officer: To investigate refuse disposal systems; and To enforce any regulation of the Department concerning refuse disposal systems.