Septic Systems

Applications

• Please complete the Application for License to Install Onsite Water Treatment Systems for new buildings without an existing septic system.
• For connecting new buildings to an existing septic system, please contact us at EHWaterProgram@adcogov.org or 303.288.6816.
• If you are adding a new Accessory Dwelling Unit (ADU) or a mobile home, please contact us at EHWaterProgram@adcogov.org or 303.288.6816.

Application Process

1. Get a soils report and a septic system design from a designer who has passed the National Association of Wastewater Technicians (NAWT) septic system design course. A Colorado-registered professional engineer may be required in some cases. Please note: A full design is not needed to replace only a septic tank.
2. Submit a septic system permit application to EHWaterProgram@adcogov.org along with the septic system design and soils report. You may also submit these items through the online portal or in person at our Commerce City office.
3. Pay the appropriate permit fee. You can pay this online when applying, over the phone when our team contacts you, or in person at our Commerce City office.
4. Our team will review the septic system design and issue the permit if the application complies with Regulation O-22.
5. Find an installer who the Adams County Health Department licenses to install the septic system. Once the installer is near completion, they will request a final inspection.
6. If no issues are found in the final inspection, we will approve the installer’s backfilling of the system.
7. Upon passing inspection, the designer will send us a letter ensuring the system matches their design. We will then issue a use permit for the system. Adams County Code Compliance requires this permit for the house to be certified for occupancy.

Applications
A use/transfer of title permit is required.

Application Process

1. Have an inspector certified by the National Association of Wastewater Technicians (NAWT) or the National Sanitation Foundation inspect the system. In most cases, they must pump out the septic tank(s).
2. Submit the application and inspection forms to EHWaterProgram@adcogov.org. These can also be submitted through the online portal or can be paid in person at our Commerce City Office.
3. Pay the appropriate permit fee. You can pay this online when applying, over the phone when our team contacts you, or in person at our Commerce City office.
4. Our team will review the submitted forms. If no issues are found, we will issue a permit and send it to the email address listed on the application.

A Use Permit is required for this. Please note that additions that exceed the number of bedrooms a septic system was designed for may need an expansion or repair permit as well.

If you plan to add an additional unit or connect a mobile home, please contact us at EHWaterProgram@adcogov.org or 303.288.6816 to determine what is needed.

Needed Application

• For replacing an existing septic tank or adding a septic tank to an existing system, please complete the minor repair permit application.
• For replacing a leach field of an existing system, please fill out the major repair permit application.
• For replacing a leach field and septic tank(s), where at least one original septic tank is not replaced, please fill out the major repair permit application.
• For replacing a leach field and septic tank(s), where no original septic tank remains, please fill out an install permit application.
• For adding an additional leach field or expanding an existing leach field, please fill out an expansion permit application.