Pima Association of Governments: Tucson Regional Planning

The Pima Association of Governments (PAG) is the metropolitan planning organization (MPO) responsible for coordinating transportation, land use, and regional infrastructure planning across the Tucson metropolitan area. Established under federal mandate, PAG serves as the primary intergovernmental forum through which local jurisdictions align policy, funding priorities, and long-range planning decisions. Its authority derives from both federal transportation statutes and Arizona state enabling legislation, making it a critical node in the governance structure of southern Arizona.

Definition and scope

PAG was designated as the MPO for the Tucson urbanized area by the Governor of Arizona in accordance with requirements established under 23 U.S.C. § 134, which mandates that urbanized areas with populations exceeding 50,000 establish an MPO to receive federal transportation funding. The Tucson urbanized area population, as recorded in the 2020 U.S. Census, exceeded 1 million residents, placing it in the category of a Transportation Management Area (TMA) — a designation that carries additional federal planning and oversight requirements (Federal Highway Administration, 23 CFR Part 450).

PAG's member jurisdictions include Pima County, the City of Tucson, the Town of Marana, the Town of Oro Valley, the Town of Sahuarita, South Tucson, and the Pascua Yaqui Tribe. The Tohono O'odham Nation participates as an associated member. The governing board — the PAG Regional Council — comprises elected officials from each member jurisdiction, and voting weight is allocated by population and jurisdictional representation formulas established in the PAG Intergovernmental Agreement.

The geographic scope of PAG's planning authority is defined by the federally designated urbanized area boundary, which the U.S. Census Bureau delineates following each decennial census. Planning functions extend to surface transportation, transit, bicycle and pedestrian infrastructure, air quality conformity determinations, and freight movement within this boundary.

How it works

PAG operates through a tiered planning structure required by federal law:

  1. Long Range Transportation Plan (LRTP) — A 20-year planning horizon document that identifies regionally significant transportation investments. Federal regulations under 23 CFR § 450.324 require this plan to be updated every 4 years in air quality nonattainment and maintenance areas. The Tucson region is classified as a maintenance area for carbon monoxide and particulate matter under the Clean Air Act (U.S. EPA, Nonattainment Area Designations).

  2. Transportation Improvement Program (TIP) — A 4-year programming document listing projects approved for federal funding. Each project in the TIP must be financially constrained, meaning total programmed costs cannot exceed projected available revenues.

  3. Unified Planning Work Program (UPWP) — An annual document describing all planning activities PAG will conduct and the federal, state, and local funds budgeted for those activities.

  4. Air Quality Conformity Determination — Because the region carries an air quality maintenance designation, every LRTP and TIP amendment requires a conformity analysis demonstrating that planned projects will not cause or worsen violations of National Ambient Air Quality Standards (NAAQS).

Federal funding flows to PAG member jurisdictions through the Arizona Department of Transportation (ADOT), which serves as the state department of transportation responsible for apportionment and suballocation of federal Surface Transportation Program funds. PAG produces regional prioritization scores that inform ADOT's programming decisions for projects within the urbanized area.

Compared to the Maricopa Association of Governments, which administers the Phoenix TMA — the largest MPO in Arizona by population and federal funding volume — PAG operates at a smaller scale but with equivalent structural obligations under federal law. Both agencies must comply with the same 23 CFR Part 450 planning regulations, conduct the same plan cycles, and maintain identical federal certification requirements.

Common scenarios

Regional planning decisions that flow through PAG's processes include:

The Arizona Department of Transportation participates in PAG processes as a non-voting member for state highway projects within the urbanized area, ensuring state and regional programming remains coordinated.

Decision boundaries

PAG's authority is procedural and coordinative rather than regulatory. It does not hold land use zoning authority, cannot impose development standards on member jurisdictions, and has no enforcement power over local general plans. Land use decisions remain with individual municipalities and Pima County under Arizona Revised Statutes Title 9 (municipalities) and Title 11 (counties).

Scope limitations and coverage boundaries:

For a broader orientation to how regional planning bodies like PAG fit within Arizona's intergovernmental structure, the Arizona Government Authority home provides reference context on state and local governance relationships. Additional background on councils of governments operating elsewhere in Arizona is available at Arizona Council of Governments.

The Tucson Arizona Government page covers the City of Tucson's municipal governance structure, which intersects with PAG processes through the city's membership on the PAG Regional Council and its operation of the Sun Tran transit system.

References