Septic Systems

On-Site Wastewater Treatment Systems

An On-Site Wastewater Treatment System (OWTS), commonly known as a septic system, treats sewage on an individual’s property in the ground. Septic systems are installed on properties that cannot be served by publicly-owned wastewater collection and treatment systems which move sewage away from properties. Proper site evaluation, system selection and layout, installation, inspections and maintenance are essential in the onsite treatment of sewage. 


On-Site Wastewater Treatment Requirements

Tri-County Health Department regulates all OWTS in Adams, Arapahoe, and Douglas counties and the program includes:
  • Issuance of permits to install, repair, expand, use, or operate a system
  • Plan review, site evaluation(s) before installation, final inspection(s) after installation, and certification before the system is put into use
  • Investigation of malfunctions of systems
  • Enforcement

Education and Care

 Site and Soil Evaluators and Designers

 Regulation, Applications, and Forms

  1. New / Expand / Repair Permits
  2. Use Permits
  3. Septic Professionals
A septic permit is required for new installations, expansions, and repairs (with some exceptions). To obtain a permit, the following will be required: completed permit application, payment of permit fee, soil investigation and design document. Tri-County can accept permit applications at our Environmental Health Offices, or via email at: Tri-County staff will then review the information and make a site visit. If the application, engineer design (if applicable), design document and site meet our requirements, Tri-County will issue a permit to construct or repair an OWTS. Tri-County may require additional information depending on the conditions at the site. After the system is constructed (but before it's covered with soil) or is repaired, Tri-County staff will make a final site visit to ensure the work was completed per the OWTS Regulations. A Use Permit will be issued when the system is approved.