Sec. 4. (a) The department under IC 13-14-2-2:
(1) may investigate allegations of; and
(2) shall investigate confirmed incidents of;
contamination of groundwater that affect private water supply wells.
(b) The commissioner shall:
(1) issue an advisory to the users and owners of a water well found to be contaminated concerning the hazards to health posed by the contamination;
(2) take emergency action, including emergency action under IC 13-14-10, to reduce exposure to well water contaminants that pose a threat to human health; and
(3) as appropriate to safeguard human health, order abandonment of contaminated water wells.