Conn. Agencies Regs. § 7-453-10
Any municipality desiring to terminate its participation in the Old-Age, Survivors, Disability, and Health Insurance System may, by vote of its legislative body, make application therefor to the commission. Such application for termination shall be made at least thirty months prior to the intended termination date and, upon its approval by the commission, the municipality shall terminate its participation in the plan in accordance with the terms of such approved application at the end of the calendar quarter specified therein. This plan may be terminated in its entirety or with respect to any coverage group only if it has been in effect from the effective date specified herein for not less than fifty-four months prior to receipt by the commission of an application to terminate with respect to any group for which termination is sought.
Conn. Agencies Regs. § 7-453-10