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Glendale, AZ - Water Services - Treatment
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Water and Wastewater Pretreatment Program


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Our Pretreatment Program is responsible for monitoring and controlling wastewater pollution from commercial and industrial sources within the City of Glendale. This opening page has links to more detailed information regarding the various areas of responsibility within our Pretreatment Program. To learn more about the different aspects of this program simply click one of the buttons on the left side of each page. Phone numbers and links to other governmental agencies, along with various water quality and environmental web sites, are listed on the “Related Links” page. If you have any questions, please email us at We attempt to reply to all messages when appropriate.


The City of Glendale’s Pretreatment Program officially began in 1983 as a requirement of the U.S. Environmental Protection Agency. The 1972 Clean Water Act and the 1978 Federal General Pretreatment Regulations are the basis of this requirement. The five different municipalities discharging into the 91st Avenue treatment plant located in Phoenix were required to initiate a Pretreatment Program as a condition of the NPDES (National Pollutant Discharge Elimination System) permit issued to that facility. These five municipalities comprise the Sub Regional Operating Group (SROG) that jointly own the 91st Avenue treatment facility and are responsible for ensuring compliance with all Federal Pretreatment regulations.

Specific objectives of the Pretreatment Program are:

  • Prevent interference in wastewater treatment processes at our POTWs (Publicly Owned Treatment Works).
  • Prevent pass-through of pollutants from treatment works into receiving streams.
  • Prevent contamination of treatment plant sludge to allow for land application and/or landfilling.
  • Protect the health and safety of sewer and treatment plant workers.

Prescription/Non-Prescription Medication Disposal

NEW! Download the Prescription/Non-Prescription Medication Disposal Brochure (PDF)

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