Permitting Information

Significant Industrial User (SIU) and Pretreatment Requirements

The EPA has developed federal wastewater discharge limits for specific categorical processes. The City of Phoenix has also developed local limitations that generally apply to specific industrial processes. 

The City issues Class A industrial wastewater discharge permits to:​

  • Significant Industrial Users (SIU) operating federally regulated processes subject to categorical pretreatment standards under Title 40 the Code of Federal regulations; or

  • Companies that discharge an average 25,000 gallons per day of process wastewater to City sewers; or

  • Companies with effluent characteristics that indicate a potential to impact wastewater treatment facilities.

City of Phoenix Code Chapter 28 spells out the various requirements and permit costs. The FAQ section provides briefer relevant Chapter 28 excerpts.

The City has developed a Civil Penalty Policy containing detailed procedures as to how the Environmental Services Division will calculate civil penalties for instances of noncompliance.

Permitting Flowcharts

Questions about whether a permit is required?
Review this flowchart.

Like to know more about the permit process?
Review this flowchart. 

Permitting Time Frames

Applications for permits are subject to the Permitting (Licensing) Time Frames (State Law A.R.S. ss 9-835), which limits the number of business days the City of Phoenix has to review your project. To view a summary of the time frames click the link above.