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Working with our community to ensure
a safe and healthy environment.

On-site Wastewater Treatment Facilities (OSWTFs or Septic Systems)

Onsite Submittal Packets, Information Sheets and Applications are being revised. The current documents are still in use. It has been reported that there are some problems retrieving and printing clear copies of documents from this site. If thereis a problem in printing any document(s), call 602-506-6616 or e-mail and request a clear copy of the document needed.

Maricopa County Environmental Services Department (MCESD), Water & Waste Management Division (WWM) receives its authority to administer the Aquifer Protection Permit Program, Type 4 General Permits by delegation from the Arizona Department of Environmental Quality (ADEQ). Through this authority, MCESD is responsible for performing:

  • Site investigations
  • Soil evaluations
  • Plan reviews
  • Issuance of permits (Construction Authorization-CA)
  • Construction inspections
  • Issuance of approvals to discharge (Discharge Authorization-DA) for OSWTFs in Maricopa County
Please contact the Onsite Wastewater Program at with any questions or concerns you may have.