"Regional Planning Organizations are statutorily authorized regional entities voluntarily established by the municipalities located within the  state-defined planning regions."[3, p.i] There is no requirement that they be formed.
Regional Councils of Governments (RCOGs) are the only type of RPO authorized in Connecticut as of January 1, 2015.
Connecticut has nine geographic planning regions as of January 1, 2015 (previously: 15 planning regions that had minor variation over time). Membership in RPOs was, and still is, voluntary - municipalities are assigned to a planning region by Office of Policy and Management (OPM), but they are not required to join the corresponding organization(s). There were variations in the beginning years, as the program addressed issues and smoothed out kinks.
"The former Connecticut Development Commission designated the regions during the 1950s to prevent the proliferation of geographically small planning regions and organizations. But towns within a region can petition the OPM secretary to subdivide the region, which he may do only if the proposed region would better address the towns’ needs..."
Connecticut had, and still has, wide variation between different areas and municipalities within the state. This fact impacts regional planning as much as the other issues concerning Connecticut and its people. Differences between the RPOs often reflected this variationcal regional planning area may serve as the Metropolitan Planning Organization (MPO) for one or more federally-defined metropolitan planning areas, with regard to transportation planning.
Currently 9 RPOs, with jurisdictions matching geographic boundaries of state-defined regional planning areas.
Through local ordinances. The municipalities within each planning region pass local ordinances to voluntarily create, and join, a Regional Planning Organization (RPO).
Voluntary. Municipalities must pass ordinance to join. Membership dues are set by each RPO.
Regional Planning Organizations (RPOs) have planning authority to consider a broad range of matters. Because municipalities form and join the RPOs voluntarily based on local ordinances, the RPOs may vary in tasks/issues addressed. For details, you might want to check the RPO's individual web sites and/or the Connecticut General Statutes (CGS). A few examples might be:
Types of RPOs
Currently Regional Councils of Government (RCOGS) are the only authorized type of RPO in Connecticut, although in the past Regional Planning Agencies (RPAs) and Regional Councils of Elected Officials(RCEOs) were authorized. Some RPOs changed organizational type over the years - for example, when legislation authorized a new structure of RPO and/or changed authorities and duties of a type.
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