Septic Systems

An On-Site Wastewater Treatment System (OWTS), commonly known as a septic system, treats the wastewater on an individual’s property. Septic systems are installed on properties that cannot be served by a wastewater utility. Arapahoe County Public Health permits the installation, repair, and use of these systems in the County.

Arapahoe County OWTS Regulations

Colorado OWTS Regulations

Online Septic Record Search

Septic Record Request

Review fees

Septic Permit Process

A septic permit is required for new installations, expansions, and repairs. Begin by applying for a septic permit and providing all required information below:

Permit applications may be sent to the Environmental Health offices or emailed.

Find an OWTS Professional

Use Permits

A Use Permit is required for:

  • A sale or change of ownership of a property
  • A change in use of the property (i.e., a residence to a business)
  • Any addition of bedrooms
  • An addition of a separate "modular" home
  • Other reasons deemed necessary by the department

To obtain a permit, the following is required:

Use permit inspections must be conducted by a Certified NAWT Inspector.

New/Renewal Applications for Professionals

All Onsite Wastewater Treatment System designers, soil evaluators, installers, inspectors, operation and maintenance providers, and pumpers will be required to obtain the National Association of Wastewater Technicians (NAWT) training course for the discipline they want to work in.

Permit applications may be sent to any of our Environmental Health offices or via email.

Contact Us

  1. Environmental Health


    Email Environmental Health

    Altura Plaza
    15400 E. 14th Pl., Suite 115
    Aurora, CO 80011

    Willow
    6162 S. Willow Dr., Suite 100
    Greenwood Village, CO 80111

    Phone: 303-795-HLTH (4584)