Water resources in the PAG region include groundwater, Central Arizona Project water, surface water, reclaimed water (effluent reuse), and stormwater. The region depends on water to sustain urban, agricultural, and mining interests as well as natural habitat. 

PAG’s Watershed Program coordinates with local governments to discuss concerns and works to effect change at the state level as needed.

The Tucson region places a priority on preserving important habitat, wildlife corridors and critical linkages while continuing to grow and meet development demands. Pima County recently developed a long-term vision for protecting the region's heritage and natural resources through its Sonoran Desert Conservation Plan. Critical Habitat, biological corridors and riparian protection were some of the main features evaluated as part of this study.

Both the Town of Marana and the City of Tucson are working on their respective Habitat Conservation Plans, which propose conservation measures to aid the preservation needs of specific species. This work has been conducted in response to listings or potential listings of species under the Endangered Species Act.

• Sonoran Desert Conservation Plan
• Town of Marana Environmental Division
• City of Tucson Habitat Conservation Plan