(1)    The department may, after being notified that an occupant of a dwelling or premises who is under 6 years of age has blood lead poisoning or lead exposure, present official credentials to the owner or occupant of the dwelling or premises, or to a representative of the owner, and request admission to conduct a lead investigation of the dwelling or premises. If the department is notified that an occupant of a dwelling or premises who is a child under 6 years of age has an elevated blood lead level, the department shall conduct a lead investigation of the dwelling or premises or ensure that a lead investigation of the dwelling or premises is conducted. The lead investigation shall be conducted during business hours, unless the owner or occupant of the dwelling or premises consents to an investigation during nonbusiness hours or unless the department determines that the dwelling or premises presents an imminent lead hazard. The department shall use reasonable efforts to provide prior notice of the lead investigation to the owner of the dwelling or premises. The department may remove samples or objects necessary for laboratory analysis to determine the presence of a lead hazard in the dwelling or premises. The department shall prepare and file written reports of all lead investigations conducted under this section and shall make the contents of these reports available for inspection by the public, except for medical information, which may be disclosed only to the extent that patient health care records may be disclosed under ss. 146.82 to 146.835. If the owner or occupant refuses admission, the department may seek a warrant to investigate the dwelling or premises. The warrant shall advise the owner or occupant of the scope of the lead investigation.

   (2)   If the department determines that a lead hazard is present in any dwelling or premises, the department may do any of the following:

      (a)    Cause to be posted in a conspicuous place upon the dwelling or premises a notice of the presence of a lead hazard.

      (b)    Inform the local health officer of the results of the lead investigation and provide recommendations to reduce or eliminate the lead hazard.

      (c)    Notify the occupant of the dwelling or premises or the occupant’s representative of all of the following:

         1.    That a lead hazard is present on or in the dwelling or premises.

         2.    The results of any lead investigations conducted on or in the dwelling or premises.

         3.    Any actions taken to reduce or eliminate the lead hazard.

      (d)    Notify the owner of the dwelling or premises of the presence of a lead hazard.

   (2m)   If the department determines that a lead hazard is present in any dwelling or premises, the local health department shall and the department may issue an order that requires reduction or elimination of an imminent lead hazard within 5 days after the order’s issuance and reduction or elimination of other lead hazards within 30 days after the order’s issuance, except that, for orders that are issued between October 1 and May 1 and that relate only to exterior lead hazards that are not imminent lead hazards, the order may require elimination or reduction of the lead hazard no earlier than the June 1 immediately following the order’s issuance. If the agency that issued the order determines that the owner has good cause for not complying with the order within the 5-day or 30-day time period, the agency may extend the time period within which the owner is required to comply with the order. The failure to comply with an order within the time prescribed or as extended shall be prima facie evidence of negligence in any action brought to recover damages for injuries incurred after the time period expires. If an order to conduct lead hazard reduction is issued by the department or by a local health department and if the owner of the dwelling or premises complies with that order, there is a rebuttable presumption that the owner of the dwelling or premises has exercised reasonable care with respect to lead poisoning or lead exposure caused, after the order has been complied with, by lead hazards covered by the order, except that with respect to interim control activities the rebuttable presumption continues only for the period for which the interim control activity is reasonably expected to reduce or eliminate the lead hazard.

   (2r)   The department may conduct or require a certified lead risk assessor or other person certified under s. 254.176 to conduct a lead investigation, a check of work completed, and dust tests for the presence of hazardous levels of lead to ensure compliance with an order issued under sub. (2m).

   (4)   The department shall give priority to eliminating lead hazards from dwellings in which children under 6 years of age with diagnosed lead poisoning or lead exposure reside.