How do I get a permit to build a new, or repair an on-site wastewater treatment system (OWTS)?

An OWTS permit is required for new installations, expansions, and repairs (with some exceptions). To obtain a permit, the following will be required for new systems/new soil treatment areas (STA’s): completed permit application, payment of permit fee, system design, soils information, test pit logs, percolation tests (if used), and a site plan. Tri-County Health Department (TCHD) will accept the applications at our Environmental Health Offices. TCHD staff will then review the information and make a site visit. If the application, design (if applicable) and site meet our requirements, TCHD will issue a permit to construct, expand or repair the OWTS.



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1. How do I get a permit to build a new, or repair an on-site wastewater treatment system (OWTS)?
2. Under what conditions must an on-site wastewater treatment system (OWTS) be designed by a Colorado Licensed Professional Engineer?
3. How do I get a Use Permit?
4. Who can do Use Permit inspections?
5. I am selling my property and need to get my waste water system certified. What should I do?
6. What is the minimum lot size for an on-site wastewater treatment system (OWTS)?
7. How often do I need to pump my septic tank?
8. Will I be able to irrigate or have horses where my Soil Treatment Area (STA) is located?
9. Can I install a bathroom in a garage, barn, etc., and connect it to my existing on-site wastewater treatment system (OWTS)?
10. I am unsure where my onsite waste water treatment system (OWTS) is located. Do you have records of my system?
11. I accidentally damaged some components of my septic system. Who should I call to inspect and repair the damage? Do I need a permit?