Septic Systems (On-site Wastewater Treatment System)
An On-site Wastewater Treatment System, also known as septic systems, is any system used for the collection, storage, treatment, neutralization, or stabilization of sewage that occurs on the property. A licensed installer or contractor must inspect On-site Wastewater Treatment Systems. Contact an environmental health specialist at 720.887.2220 to become a licensed inspector.
Regulation and Fees
On-site Wastewater Treatment System Application
Resources to apply for an on-site wastewater treatment system:
- On-site Wastewater Treatment System Permit Application
- Requirements for Submitting On-site Wastewater Treatment System Application
- Percolation Test Summary and Data
- Percolation Test Result
- Soil Profile Test Pit Log
- System Cleaners License Application
- System Cleaners Log
- Contractors Application to Install
- Tank Replacement and Pump Worksheet
- Agreement to Forego Expansion of an On-site Wastewater Treatment System
- Conventional Non-Engineered OWTS Design Worksheet
Use Permits
Resources to obtain or renew Use Permits:
- Use Permit Application
- National Association of Wastewater Technicians Inspector and Service Search
- Use Permit Inspection Report
- Agreement to Repair an On-site Wastewater Treatment System
- Use Permit Deficiency Repair Verification
Homeowner Videos
Watch this video for a quick overview of an on-site wastewater treatment inspection and maintenance.
Learn about on-site wastewater treatment system regulations, how they function, and how to maintain your individual system to protect water quality and the environment.