Conn. Gen. Stat. § 10a-259

The exercise of the powers granted by sections 10a-250 to 10a-263 , inclusive, shall constitute the performance of an essential governmental function and the corporation shall not be required to pay any taxes or assessments upon or in respect of hospital facilities, or any property or moneys of the corporation, levied by any municipality or political subdivision or special district having taxing powers of the state, nor shall the corporation be required to pay state taxes of any kind. The corporation, its projects, property and moneys shall at all times be free from taxation of every kind by the state and by the municipalities and all other political subdivisions or special districts having taxing powers of the state.