Conn. Gen. Stat. § 19a § 19a-111

(a) The Commissioner of Public Health shall develop informational materials describing the dangers of lead poisoning, precautions to reduce the risk of lead poisoning, potential eligibility for services for children from birth to three years of age pursuant to sections 17a-248 to 17a-248i, inclusive, laws and regulations concerning lead abatement and any other information as prescribed by the commissioner. The director of health of the town, city, borough or district shall provide, or cause to be provided, such informational materials to the parent or guardian of a child who is (1) known to have a blood lead level of three and one-half micrograms per deciliter of blood or more, or (2) the subject of a report by an institution or clinical laboratory, pursuant to section 19a-110. The director of health need only provide, or cause to be provided, such information to such parent or guardian on one occasion after receipt of an initial report of an abnormal blood lead level as described in section 19a-110.

(b) Upon receipt of each report of a child with a blood lead level (1) equal to or greater than ten micrograms per deciliter but less than fifteen micrograms per deciliter on or before January 1, 2024, and (2) equal to or greater than five micrograms per deciliter but less than ten micrograms per deciliter from January 1, 2024, to December 31, 2024, inclusive, the director shall conduct an on-site inspection to identify the source of the lead causing such blood lead level and order remediation of such source by the appropriate persons responsible for the conditions at such source.

(c) Upon receipt of each report of a blood lead level equal to or greater than fifteen micrograms per deciliter of blood from January 1, 2023, to December 31, 2023, inclusive, ten micrograms per deciliter of blood from January 1, 2024, to December 31, 2024, inclusive, and five micrograms per deciliter of blood on and after January 1, 2025, the local director of health shall make or cause to be made an epidemiological investigation of the source of the lead causing the increased lead level or abnormal body burden and shall order action to be taken by the appropriate person responsible for the condition that brought about such lead poisoning as may be necessary to prevent further exposure of persons to such poisoning. In the case of any residential unit where such action will not result in removal of the hazard within a reasonable time, the local director of health shall utilize such community resources as are available to effect relocation of any family occupying such unit. The local director of health may permit occupancy in said residential unit during abatement if, in such director's judgment, occupancy would not threaten the health and well-being of the occupants.

(d) The local director of health shall, not later than thirty days after the conclusion of such director's epidemiological investigation, report to the commissioner, using a web-based surveillance system as prescribed by the commissioner, the result of such investigation and the action taken to ensure against further lead poisoning from the same source, including any measures taken to effect relocation of families. Such report shall include information relevant to the identification and location of the source of lead poisoning and such other information as the commissioner may require pursuant to regulations adopted in accordance with the provisions of chapter 54. Nothing in this section shall be construed to prohibit a local building official from requiring abatement of sources of lead or to prohibit a local director of health from making or causing to be made an epidemiological investigation upon receipt of a report of a blood lead level that is less than the minimum blood level specified in this section.