How to Install a Septic System: Costs, Requirements, and Step-by-Step Guide in Maricopa County, Arizona

In Arizona, the installation of a septic system is a heavily regulated procedure overseen by the Arizona Department of Environmental Quality (ADEQ) and administered at the county level. The ADEQ sets forth detailed guidelines and standards to ensure septic systems are designed, installed, and maintained to safeguard public health and the environment. This regulatory framework is essential in Arizona, where water scarcity and soil conditions can greatly affect the performance of septic systems.

In Maricopa County, Arizona, installing a septic system requires compliance with specific regulations and obtaining necessary permits. For the most current and detailed requirements, it’s best to contact the Maricopa County Environmental Services Department directly or visit their website. Regulations can vary based on specific site conditions and system types.

Here are the general requirements:

• Permitting:

  • You must obtain a Septic System Permit from the Maricopa County Environmental Services Department before installation.

  • Apply for an Abandonment Permit if you need to remove an old septic system.

• Site Evaluation:

  • A site evaluation or soil test (percolation test) is required to determine if the property is suitable for a septic system. This assesses soil conditions, slope, and space for the system.

• Design Approval:

  • The septic system design must be prepared by a licensed design professional and approved by the county. It should ensure that all calculations and specifications are based on the number of bedrooms, fixture unit counts, anticipated wastewater flow, system capacity, setback distances, and environmental protection standards.

• Setback Requirements:

  • The system must be installed with proper setbacks from wells, property lines, buildings, and water bodies, typically dictated by county standards.

• Installation by Licensed Contractors:

  • The installation must be performed by a licensed septic system installer registered with Maricopa County.

  • To find out if contractor's Registrar of Contractors license is current: Contractor Search

• Inspection:

  • The county will conduct inspections during and after installation to ensure compliance with approved plans and regulations.

• Record Keeping:

  • Maintain records of permits, soil tests, system design, and inspections.

Before beginning the installation, ensure you have submitted the design plans and necessary application forms to the local health or environmental department for approval, and obtained the "Authorization to Construct" septic system permit/number.

Once approval is granted:

• Drop Off:

  • Collect materials from suppliers and/or arrange for suppliers to deliver them to the specified site location.

• Prepare the Site:

  • Clear the installation area, removing any obstructions, trees, or debris.

  • Mark the locations for the septic tank, drainfield, and any necessary access points.

• Excavate Soil:

  • Excavate the area for the septic tank according to the approved plan.

  • To prevent any installation delays, avoid any underground utility lines during the excavation process.

    
    

• Install the Septic Tank:

  • Position and level the tank in the designated excavated space for the septic tank.

  • Assemble and install additional components to the septic tank if necessary.

• Install the Drainfield:

  • Excavate trenches or seepage pits for the drainfield, ensuring proper measurements.

  • Lay the perforated pipes in gravel-filled trenches or seepage pits, then cover with soil, following approved design specifications.

    
    

• Connect the Plumbing:

  • Connect the septic tank outlet to the choice of leach field.

  • Connect the septic tank inlet to the house’s main sewer line.

    
    

• Test:

  • Conduct tests to ensure the system functions correctly and all connections are secure and properly sealed.

  
  

• Backfill and Abandonment:

  • Backfill around the tank and drainfield with soil, compacting lightly to prevent settling.

  • In the backfill phase, if there is a system on the lot that needs to be abandoned, eliminate it by demolishing or filling in the tank to seal it and prevent environmental contamination or hazards.

    
    

• Inspect:

  • Schedule a "Request to Discharge Authorization" with the local authority during and after installation to verify proper setup.

    
    

• Finalize and Cover:

  • Obtain final approval or certification from the county.

  • Complete any finishing work, such as restoring landscaping or driveway surfaces.

  
  

• Maintain the System:

  • Follow maintenance guidelines, including regular inspections and pumping, to ensure longevity and proper operation

The price of installing a septic system in Arizona can differ significantly based on various factors. Primary among these is the complexity of the treatment technology required for your specific soil type. As a typically competitive septic installation company, the cost for a standard residential septic system can range from $2,000 to $10,000. In contrast, an alternative septic system generally costs between $5,000 and $10,000 or more.

Some key factors that influence the overall cost:

• System Size and Design: Larger systems or those with advanced features may cost more.

• Site Conditions: Soil type, terrain, and accessibility can impact excavation difficulty and materials needed.

• Permits and Fees: Local permitting fees and inspection costs vary by county.

• Soil Testing and Site Evaluation: Required prior to installation, usually included in the overall estimate.

• Tank Type: Concrete or polyethylene tanks may differ in cost.

• Drainfield Type: Conventional or alternative drainfields vary in price.

• Labor Costs: Vary based on contractor rates and project complexity.

• Additional Work: Such as waterline adjustments, landscaping restoration, or access roads.

At BEST Septic Solutions, we provide comprehensive services for septic system installation, including professional site evaluations, custom system design, and the complex Arizona permitting process. Our pricing structure is designed to cater to a variety of needs, from standard gravity systems to advanced alternative solutions required for Arizona’s unique soil conditions. From the rocky foothills to the valley floor, every property presents different challenges, the most accurate way to budget is with a site-specific assessment. Contact us today to schedule your initial site walk-through and take the first step toward a reliable, code-compliant septic system.