Official sources checked August 30, 2026

Pinal County, Arizona septic permits and requirements

Arizona county-delegation framework

ADEQ states that it has statewide authority for onsite wastewater treatment facilities and has delegated permitting authority to each of Arizona’s 15 counties. ADEQ rules continue to apply statewide, while delegated counties may impose separate or stricter local standards. Applicants should submit through the county where the property is located unless a specific system remains under direct ADEQ jurisdiction.

Property transfer has a statewide inspection and notice process

Arizona requires an onsite-system inspection in connection with a property transfer and requires the buyer to submit the applicable Notice of Transfer within 15 calendar days after transfer. ADEQ identifies county-specific filing paths for delegated counties, so owners should use the current transfer instructions for the property location.

Aquifer Protection administers local septic permitting and inspection

Pinal County states that its Aquifer Protection Program carries out permitting and inspections for conventional onsite wastewater systems up to 24,000 gallons per day and alternative systems up to 3,000 gallons per day. The county issues construction permits, inspects system construction, tracks septic locations, regulates alternative-system installation, and inspects and permits septic pumpers and waste haulers.

A county permit is required before new construction, repair, or alteration

Chapter XI of the Pinal County Environmental Health Code states that no person may begin construction of a new onsite wastewater treatment facility, or repair or alter an existing facility, without an onsite wastewater permit from Pinal County.

A qualified site inspection is part of the application path

Pinal County directs applicants without a sewer connection option to apply for a septic permit and states that a site inspection by a qualified inspector is required. The county also maintains separate site-investigation and percolation/seepage-pit evaluation services.

County jurisdiction distinguishes conventional and alternative system sizes

Pinal County publishes separate program limits for conventional and alternative systems. Applicants with larger, unusual, or multi-permit projects should verify whether the county or ADEQ will perform the applicable review rather than assuming the residential septic workflow applies.

Septic abandonment has a specific closure procedure

Pinal County states that a separate permit is not required for septic abandonment, but the tank must be pumped, electrical and mechanical components disconnected and removed, the tank removed/collapsed or completely filled with approved material, and the abandoned building sewer cut and plugged. The county must be notified within 30 days of closure.

Current county fees distinguish permit, alteration, transfer, and inspection work

Pinal County publishes Aquifer Protection fees for Type 4 permits, transfers, alternative design review, onsite investigation, and related services. Applicants should use the current county fee schedule because system type and design flow affect the applicable fee.

Official sources

• Arizona Department of Environmental Quality — Onsite Wastewater Treatment Facilities
• ADEQ — Delegation Agreements
• ADEQ — Notice of Transfer and Inspection
• Pinal County — Wells & Septic
• Pinal County — Community Development / Aquifer Protection FAQ
• Pinal County — Environmental Health Code
• Pinal County — Current Community Development Fee Schedules

SepticScope summarizes public-agency information for planning purposes. The permitting agency's current instructions control if they differ from this guide.