MARICOPA ASSOCIATION OF GOVERNMENTS

Transportation Planning - As the designated Metropolitan Planning Organization (MPO) for the region, MAG conducts a continuing, cooperative, and comprehensive transportation planning process. MAG plans and allocates funding for a multimodal regional transportation system, including freeways, arterials, transit, and active transportation, to support a region of over 5 million people. Key activities include the development and implementation of the MOMENTUM Regional Transportation Plan, which includes a dedicated half-cent sales tax to invest in regional infrastructure. Planning efforts include consultation with federal, state, Native nations, and environmental and resource agencies, as well as public outreach involvement. MAG utilizes state-of-the-practice travel demand modeling to analyze traffic, improve safety, and enhance air quality in accordance with federal planning emphasis areas.

Environmental Planning - The Environmental Planning Division manages regional planning for Air Quality, Water Quality, and Solid Waste Management. Air Quality Planning: As the designated Regional Air Quality Planning Agency since 1978, MAG develops plans to meet Clean Air Act standards. In 2025, the MAG Regional Council adopted the 2025 Eight-Hour Ozone Plan and conducted a retrospective demonstration of the impact of international emissions on regional ozone concentrations. MAG also performs conformity analysis for the Regional Transportation Plan and launched a consumer fireworks awareness campaign in late 2025 to mitigate PM-2.5 pollution. Water Quality Management: MAG serves as the designated Regional Water Quality Management Planning Program under Section 208 of the Clean Air Act. The division maintains the MAG 208 Water Quality Management Plan, facilitating service area expansions for wastewater treatment and coordinating with federal partners on the Rio Reimagined urban waters initiative. Solid Waste Management: MAG provides systems-level regional solid waste planning to prevent adverse public health effects. The Solid Waste Advisory Committee regularly updates facility data and service area maps to support regional waste reduction and proper disposal.