Septic Systems

The Tri-County Health Department will dissolve completely as of December 31, 2022.  On January 1, 2023, Arapahoe, Adams and Douglas Counties will provide public health services through their own, individually operated health departments. 

Douglas County residents only:  Effective September 1, 2022, the newly created Douglas County Health Department will assume responsibility for all Environmental Health services in Douglas County.   Starting September 1, 2022 please direct all questions/concerns related to Environmental Health to the Douglas County Health Department by calling 720 643 2400 or by visiting:

For OWTS professionals that work in those three counties, TCHD will be communicating with the industry towards the end of 2022 as to where to direct permitting questions and activities in each of the three counties. Continue to monitor this website for more information.


Walk-ins are welcome Tuesdays & Thursdays only – 8:00am to 5:00pm 
We are closed for lunch from 12-1pm

  • Email to request an inspection or to submit completed applications, designs, and other paperwork.
  • TCHD staff are still taking complaints/concerns of public health significance.

On-Site Wastewater Treatment 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. Tri-County Health Department permits the installation, repair, and use of these systems in our jurisdiction.


Effective October 1st, 2019, 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. More information about upcoming classes is available at For more information contact your local field office. 


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Information, Permits and Forms