All septic systems in Arizona are designed based on the Arizona Administrative Code, Title 18 Environmental Quality, Chapter 9 Water Pollution Control, Article 3 Aquifer Protection Permits. – General Permits. The current version is dated November 12, 2005.
The Arizona Department of Environmental Quality (ADEQ) is the agency charged by the state statutes to write the rules and enforce them.
ADEQ has delegated the responsibility for portions of the rules to the counties for implementation. The delegation agreements are found on the ADEQ website.
The septic system regulations are organized in Part A, General Provisions, and Part E, General Permits. Part A describes the process to apply for a Construction Authorization, how to perform a Site Investigation, and Facility Design, Operation, Maintenance, Septic Tank, and Grease Interceptor requirements.
Part E describes the different types of septic systems, both conventional and alternative and their design, maintenance and operation requirements.