Conn. Gen. Stat. § 8-3i

(b) When an application, petition, request or plan is filed with the zoning commission, planning and zoning commission or zoning board of appeals of any municipality concerning any land, all or a portion of which is within the aquifer protection area delineated pursuant to section 22a-354c or the watershed of a water company, the applicant or the person making the filing shall: (1) Provide written notice of the application, petition, request or plan to the water company and the Department of Public Health; and (2) determine if the land is within the watershed of a water company by consulting the maps posted on the department's Internet web site showing the boundaries of the watershed. Such applicant shall send such notice to the water company by certified mail, return receipt requested, and to the department by electronic mail to the electronic mail address designated on its Internet web site for receipt of such notice. Such applicant shall mail such notice not later than seven days after the date of the application. Such water company and the Commissioner of Public Health may, through a representative, appear and be heard at any hearing on any such application, petition, request or plan.

(c) Notwithstanding the provisions of subsection (b) of this section, when an agent of the zoning commission, planning and zoning commission or zoning board of appeals is authorized to approve an application, petition, request or plan concerning any land that is within the aquifer protection area delineated pursuant to section 22a-354c or the watershed of a water company without the approval of the zoning commission, planning and zoning commission or zoning board of appeals, and such agent determines that the proposed activity will not adversely affect the public water supply, the applicant or person making the filing shall not be required to notify the water company or the Department of Public Health.