Conn. Gen. Stat. § 4-146: Notice of injury by claimant.

Any person who suffers damage or injury because of the defective condition of a building, park or ground owned or leased by the state shall, within a reasonable time after such damage or injury, notify the official having control of or the agency using such building, park or ground, stating the date, time, place and circumstances of such damage or injury. No claim shall be defeated because of a lack or failure of such notice except upon a showing by the state that it was substantially prejudiced thereby.