Conn. Gen. Stat. § 46a § 46a-80c

(a) On and after January 1, 2023, it shall be a discriminatory practice:

(1) To refuse to sell or rent after the making of a bona fide offer, or to refuse to negotiate for the sale or rental of, or otherwise make unavailable or deny, a dwelling to any person on the basis of the erased criminal history record information of (A) such buyer or renter, (B) a person residing in or intending to reside in such dwelling after it is so sold, rented or made available, or (C) any person associated with such buyer or renter;

(2) To discriminate against any person in the terms, conditions or privileges of the sale or rental of a dwelling, or in the provision of services or facilities in connection therewith, on the basis of the erased criminal history record information of (A) such buyer or renter, (B) a person residing in or intending to reside in such dwelling after it is so sold, rented or made available, or (C) any person associated with such buyer or renter;

(3) To make, print or publish, or cause to be made, printed or published any notice, statement or advertisement, with respect to the sale or rental of a dwelling that indicates any preference, limitation or discrimination, or to intend to make any such preference, limitation or discrimination, based on the erased criminal history record information of (A) a potential buyer or renter, (B) a person intending to reside in such dwelling after it is sold, rented or made available, or (C) any person associated with such potential buyer or renter;

(4) To represent to any person that any dwelling is not available for inspection, sale or rental when such dwelling is in fact so available, on the basis of the erased criminal history record information of (A) a potential buyer or renter, (B) a person intending to reside in such dwelling after it is so sold, rented or made available, or (C) any person associated with such potential buyer or renter;

(5) For profit, to induce or attempt to induce any person to sell or rent any dwelling by representations regarding the entry or prospective entry into the neighborhood of a person or persons with erased criminal history record information;

(6) For any person or other entity engaging in residential real estate-related transactions to discriminate against any person in making available such a transaction, or in the terms or conditions of such a transaction, on the basis of the erased criminal history record information of (A) the other party in the transaction, (B) a person residing in or intending to reside in a dwelling with such other party, or (C) any person associated with such other party;

(7) To deny any person access to or membership or participation in any multiple-listing service, real estate brokers' organization or other service, organization or facility relating to the business of selling or renting dwellings, or to discriminate against that person in the terms or conditions of such access, membership or participation, on account of that person's erased criminal history record information; or

(8) To coerce, intimidate, threaten or interfere with any person in the exercise or enjoyment of, or on account of that person having exercised or enjoyed, or on account of that person having aided or encouraged any other person in the exercise or enjoyment of, any right granted or protected by this section.

(b) The provisions of this section shall not apply to (1) the rental of a room or rooms in a unit in a dwelling if the owner actually maintains and occupies part of such unit as the owner's residence, or (2) a unit in a dwelling containing not more than four units if the owner actually maintains and occupies one of such other units as the owner's residence.

(c) Nothing in this section limits the applicability of any reasonable state statute or municipal ordinance restricting the maximum number of persons permitted to occupy a dwelling.

(d) Nothing in this section prohibits a person engaged in the business of furnishing appraisals of real property to take into consideration factors other than a person's erased criminal history record.