Conn. Gen. Stat. § 9-140e

(b) The registrars of voters shall send written notice to each such elector with permanent absentee ballot status in January of each year, on a form prescribed by the Secretary of the State, for the purpose of determining if such elector continues to reside at the address indicated on the elector's permanent absentee ballot application. If such written notice is returned as undeliverable, the elector in question shall be removed from permanent absentee ballot status. If such elector indicates on such notice that the elector no longer resides at such address and the elector's new address is within the same municipality, the registrars of voters shall change the elector's address pursuant to section 9-35 and such elector shall retain permanent absentee ballot status. If the elector indicates on such notice that the elector no longer resides in the municipality, the registrars of voters shall remove such individual from the registry list of the municipality and send such individual an application for voter registration. Failure to return such written notice shall not result in the removal of an elector from the official registry list of the municipality or from permanent absentee ballot status.