Arizona Councils of Governments: Regional Planning Bodies

Arizona's Councils of Governments (COGs) are voluntary associations of local governments that coordinate regional planning across municipal and county boundaries. These bodies operate across transportation, land use, environmental quality, and economic development, providing a formal structure for intergovernmental cooperation that individual municipalities cannot accomplish unilaterally. The Arizona Council of Governments framework encompasses both statewide coordination mechanisms and regionally specific planning associations. Understanding how these bodies are structured, what authority they hold, and where their jurisdiction ends is essential for local officials, planners, and researchers engaged with Arizona's regional governance landscape.

Definition and scope

A Council of Governments in Arizona is a multipurpose regional organization formed under intergovernmental agreement authority established in Arizona Revised Statutes, specifically A.R.S. § 11-952, which authorizes public agencies to enter into agreements for joint exercise of powers (Arizona State Legislature, A.R.S. § 11-952). COGs are not units of general-purpose government. They do not levy taxes directly on residents, do not hold police power, and cannot override the zoning or land-use decisions of member jurisdictions.

Arizona hosts 8 recognized COGs, each serving a distinct multi-county or metropolitan region. The two largest by population and planning scope are the Maricopa Association of Governments (MAG), serving the Phoenix metropolitan area, and the Pima Association of Governments (PAG), serving the Tucson metropolitan region. Smaller COGs serve rural and semi-rural regions including the Western Arizona Council of Governments (WACOG), the Southeastern Arizona Governments Organization (SEAGO), the Central Arizona Governments (CAG), the Yavapai County Intergovernmental Planning Agency (YCIIPA), the Navajo-Hopi Inter-Tribal Planning Council (where applicable under separate federal frameworks), and the Northern Arizona Council of Governments (NACOG) (Arizona Department of Transportation, MPO/COG Contacts).

COGs that serve urbanized areas with populations exceeding 50,000 qualify as Metropolitan Planning Organizations (MPOs) under 23 U.S.C. § 134, placing them under federal transportation planning requirements administered through the Federal Highway Administration (FHWA) and Federal Transit Administration (FTA) (FHWA, Metropolitan Transportation Planning). MAG and PAG both hold MPO designation.

Scope limitations: This page covers COGs operating under Arizona state law and intergovernmental agreements within Arizona's 15 counties. Federal Indian reservations with independent governmental authority, such as the Navajo Nation, operate under separate sovereign frameworks addressed under Arizona Tribal Governments. Interstate compacts and federal designations that extend beyond Arizona's borders are not covered here.

How it works

COGs function through a governing board composed of elected officials from member jurisdictions — mayors, council members, supervisors, and in some cases appointed representatives. Membership is voluntary; a city or county joins by resolution of its governing body and executes the intergovernmental agreement. Decisions within COGs are generally made by weighted vote or majority vote depending on the COG's bylaws, with population-based weighting commonly applied in MPO policy committees.

The operational structure of a COG typically includes:

  1. Policy Committee — the governing board of elected officials that adopts plans and allocates federal funding
  2. Technical Advisory Committee (TAC) — staff-level engineers, planners, and administrators from member agencies who review technical documents
  3. Subcommittees — issue-specific working groups covering topics such as air quality, transit, water resources, or housing
  4. Professional staff — permanent employees of the COG, not employees of any member jurisdiction, who execute day-to-day planning work

Federal transportation funding flows through COGs with MPO status. The Transportation Improvement Program (TIP), a 4-year capital project list, must be approved by the MPO policy board before federal funds are released to member agencies (FHWA, TIP Requirements, 23 U.S.C. § 134). The Long-Range Transportation Plan (LRTP), required to extend at least 20 years, is the foundational policy document from which TIP projects must derive.

For air quality purposes, COGs in nonattainment or maintenance areas under the Clean Air Act coordinate with the Arizona Department of Environmental Quality (ADEQ) to ensure transportation plans conform to State Implementation Plans (SIPs) (EPA, Transportation Conformity, 40 C.F.R. Part 93).

Common scenarios

Regional transportation capital projects: A city seeking federal Surface Transportation Program (STP) funds for a arterial road expansion must submit the project through the COG/MPO process. The project must appear in both the LRTP and the TIP before FHWA can authorize federal-aid dollars. Member agencies that bypass this process are ineligible for federal transportation funding.

Housing and land use coordination: COGs facilitate but do not mandate regional housing needs assessments. In the Phoenix metro region, MAG produces regional growth forecasts adopted by member agencies as baseline data for General Plan updates. These forecasts carry no regulatory force but are embedded in the planning processes of Maricopa County and its 27 incorporated municipalities.

Air quality conformity determinations: When the Phoenix nonattainment area must demonstrate conformity under the Clean Air Act, MAG produces the regional emissions analysis. A failure of conformity would freeze all non-exempt federal transportation funding in the region — a consequence with direct budget implications for Arizona Department of Transportation (ADOT) and member cities.

Rural COG coordination: NACOG, serving Apache, Coconino, Navajo, and Yavapai counties in northern Arizona, administers Area Agency on Aging (AAA) programs under the federal Older Americans Act in addition to transportation planning, illustrating that rural COGs often carry social services coordination functions absent in urban MPOs.

Decision boundaries

The distinction between a COG acting as an MPO and a COG acting as a general regional planning body produces materially different authority levels:

Function MPO Authority General COG Authority
Federal transportation fund allocation Binding — projects must be in TIP Advisory only
Land use decisions None — deferred to member jurisdictions None
Air quality conformity Required determination with regulatory consequences No formal role
Housing policy Advisory forecasts only Advisory only
Water resource planning No direct authority Facilitation and data sharing
Emergency management coordination Facilitation only Facilitation only

COGs cannot compel member governments to adopt specific zoning, land use, or development standards. A municipality retains full authority over its General Plan and zoning code regardless of regional planning recommendations. This distinguishes COGs structurally from state agencies such as the Arizona Department of Water Resources, which holds independent regulatory authority over groundwater management.

The Arizona Open Meeting Law applies to COG governing boards and policy committees, as they are bodies of public entities conducting public business under A.R.S. § 38-431 (Arizona State Legislature, A.R.S. § 38-431). Meeting notices, agendas, and minutes are subject to public access requirements. Similarly, records held by COGs as joint-powers entities fall within the scope of the Arizona Public Records Law under A.R.S. § 39-121 (Arizona State Legislature, A.R.S. § 39-121).

Researchers and professionals seeking the broader governmental context within which COGs operate can consult the Arizona Government Authority index for agency cross-references, jurisdictional boundaries, and related regulatory structures.

References