Conn. Gen. Stat. § 7-263
Bonds, notes or other obligations issued under the authority of this chapter (1) shall be in serial form (A) maturing in annual or semiannual installments of principal that shall substantially equalize the aggregate amount of principal and interest due in each annual period, commencing with the first annual period in which an installment of principal is due, or (B) maturing in annual or semiannual installments of principal no one of which shall exceed by more than fifty per cent the amount of any prior installment, or (2) shall be in term form with mandatory deposit of sinking fund payments into a sinking fund in amounts (A) sufficient to redeem or amortize the principal of the obligations in annual or semiannual installments that shall substantially equalize the aggregate amount of principal redeemed or amortized and interest due in each annual period, commencing with the first annual period in which a mandatory sinking fund payment becomes due, or (B) sufficient to redeem or amortize the principal of the obligations in annual or semiannual installments no one of which shall exceed by more than fifty per cent the amount of any prior installment, provided such requirements will be deemed to have been met with respect to any issue if they would have been met by the issue taken together with all other bonds, notes or other obligations previously issued under this chapter, any provision of the general statutes or any special act and declared by the municipality to be part of a single plan of finance. The first installment or the first sinking fund payment of any such series of obligations, other than obligations secured solely by a pledge of revenue to be derived from sewerage system use charges, shall mature or shall be due not later than three years from the date of issue of such series and the last installment or the last sinking fund payment shall mature or shall be due not later than forty years from the date of issue of such series or, if any notes have been issued in anticipation thereof or are to be paid from the proceeds thereof, from the date of issue of the first such note. The first installment or the first sinking fund payment of any series of obligations issued under the authority of this chapter which are secured solely by a pledge of revenues to be derived from sewerage system use charges shall mature or shall be due not later than four years from the date of issue of such series and the last installment or the last sinking fund payment shall mature or shall be due not later than forty years from the date of the issue of such series or, if any notes have been issued in anticipation thereof or are to be paid from the proceeds thereof, from the date of issue of the first such note.
Conn. Gen. Stat. § 7-263
(1949 Rev., S. 741; 1949, S. 330d; 1967, P.A. 457, S. 3; P.A. 83-408, S. 3, 6; P.A. 86-350, S. 15, 28; P.A. 87-506, S. 3, 9; P.A. 89-337, S. 1, 6; June 12 Sp. Sess. P.A. 12-2, S. 132; P.A. 15-114, S. 4.)