Conn. Gen. Stat. § 31-291b
On or before October 1, 2009, the rating organization licensed pursuant to section 38a-672 shall file with the Insurance Commissioner a method of calculating workers' compensation premiums for volunteer staff which does not base such premium calculation primarily on the number of ambulances owned by the municipality or volunteer ambulance service. Such method shall be based primarily on ambulance usage and shall apply to workers' compensation insurance policies issued or renewed on or after October 1, 2009. Ambulance usage shall be determined by the estimated number of calls responded to annually. For purposes of this section, "municipality or volunteer ambulance service" means a volunteer organization or municipality licensed by the Commissioner of Public Health to transport patients.
Conn. Gen. Stat. § 31-291b
( P.A. 09-88, S. 1.)