Gilpin County Historic Courthouse front porch/entrance will be closed May 16 to June 17. Signs will redirect visitors.


Septic and Well Information

Gilpin County Public Health + Community Development


Onsite Wastewater Treatment Systems (Septic Systems)

Regulation and permitting of Onsite Wastewater Treatment Systems (OWTS) is managed jointly by Gilpin County Community Development and Gilpin County Public Health. 

Onsite Wastewater Treatment System Construction/Repair Permit Inspections

Inspections are done on Tuesdays and Thursdays. You can request an inspection online through the permit portal. If you need assistance scheduling an inspection contact staff at (303)582-5831.

Apply to Construct/Repair/Modify an OWTS

Use Permits for Title Transfer/Selling a Property

If you are selling a property with a home in unincorporated Gilpin County, you must have the property's septic system inspected and obtain a Use Permit prior to going under contract. Use Permits are valid for 6 months. Failure to obtain a Use Permit can subject you to a daily accruing penalties under Colorado law.

There are two separate applications now. One for conventional treatment level systems (TL1) and one for higher level treatment systems (TL2+) that require the property buyer or title grantee to obtain a maintenance contract and Operating Permit. It is your responsibility as the seller/title grantor to inform the buyer of these requirements. Failure to do so can result in enforcement action against you. 

Apply for Use Permit TL1 Conventional System

Apply for a Use Permit & Operating Permit TL2+ Higher Level System

Onsite Wastewater Regulations and Fees

Public Health Fee Schedule 2024

Gilpin County OWTS Regulations 2018

Colorado Regulation 43

BOH Refund Policy

BOH Policy on Determining Suitability of Existing OWTS.

BOH Policy on Maintenance of Mechanical and Secondary OWTS


The use and construction of private wells is regulated by the State of Colorado Division of Water Resources. To apply for construction of a well, locate permitted well records, and to view the state's well permit map click below: 

DNR Well Permitting

Well Water Testing Services 


CSU Private Well Fact Sheet

EPA Site for Septic Information

Contact Information

Community Development

For questions about applying for a permit, septic records, and scheduling inspections contact 

Public Health

For all other questions, contact Public Health: and