The Gila River Indian Community (GRIC) (O'odham language: Keli Akimel Oʼotham, meaning "Gila River People", Maricopa language: Pee-Posh) is located adjacent to the south side of the city of Phoenix, within the Phoenix Metropolitan Area in Pinal and Maricopa counties. 

The reservation was established in 1859, and the Gila River Indian Community was formally established by Congress in 1939. The community is home for members of both the Akimel O’odham (Pima) and the Pee-Posh (Maricopa) tribes.

The reservation has a land area of 583.749 square miles and a 2020 Census population of 14,260. It is made up of seven districts along the Gila River and its largest communities are Sacaton, Komatke, Santan, and Blackwater. Tribal administrative offices and departments are located in Sacaton. The Community operates its own telecom company, electric utility, industrial park and healthcare clinic, and publishes a monthly newspaper.

GRIC established the Department of Environmental Quality (DEQ) on August 1, 1995. At that time DEQ brought together existing programs, including environmental education and outreach, pesticides, solid waste, and water quality—again, areas symbolized in the tribal seal. Today, DEQ has expanded to include an air quality program and specific waste programs that target hazardous waste and recycling. DEQ continues to pursue expansion to address the protection and conservation of the Community wildlife and their habitat. 

Currently, there are seven (7) Community Ordinances that the department enforces. These include:

1.  Apiary Registration Code

2.  Control and Suppression of the Pink Bollworm

3.  Pesticide Ordinance

4.  Medical Waste Ordinance

5.  Waste Management Ordinance

6.  Wastewater and Reclaimed Water Management Ordinance

7.  Air Quality Management Plan