Conn. Agencies Regs. § 16-1-58
During the first thirty (30) days after the date on which the rate application is filed the applicant may revise the application. If the revision pertains to an amendment to the level of rates or the revenue requirements, then the revised application shall contain a complete revised statement and revised schedules for the proposed increases or changes in the existing rate schedule. In addition, all of the information required by Sections 16-1-53a, 16-1-55, 16-1-56, 16-1-57, and 16-1-59 shall be revised accordingly. After the first thirty (30) days following the date on which the rate application is filed the applicant may not amend or revise the level of rates shown therein except upon the granting of permission to amend by the commissioners upon motion by the applicant.
Conn. Agencies Regs. § 16-1-58