Septic Systems

Tri-County Health Department (TCHD) will be dissolving at the end of the year on December 31, 2022 into three independent public health departments serving Adams, Arapahoe, and Douglas Counties. 

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