Conn. Gen. Stat. § 7-439h
Sec. 7-439h. Erroneous payments; adjustment; waiver of repayment; regulations.
(b) If a member or beneficiary has been overpaid through no fault of his own, and he could not reasonably have been expected to detect the error, the Retirement Commission may waive any repayment which it believes would cause hardship.
(c) The Retirement Commission shall adopt regulations in accordance with the provisions of chapter 54 establishing criteria for the waiver of repayment.