Conn. Gen. Stat. § 7-100k
Appointment, qualifications and compensation of assessor or board of assessors.
(b) Any assessor appointed pursuant to subsection (a) of this section shall be sworn to the faithful performance of his or her duties by the clerk or clerks of the municipality or municipalities that provided for the appointment of such assessor, or, in the case of a regional council of governments, by the clerk of each participating municipality.