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Onsite Wastewater Treatment Systems

On-site wastewater treatment systems (OWTS), also known as septic systems, are governed by Colorado State Regulation 43, which can be found here.

Hazardous Materials and Waste Management Division 

For more information on hazardous materials and waste management, visit the website below.

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How your septic system works 

This resource explains in general terms how your septic system works.

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Why maintain your septic system 

This resource explains why it's important to maintain and preserve your septic system.

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How to care for your septic system 

This resource teaches you how to properly care for your septic system.

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Colorado Professionals in Onsite Wastewater 

The CPOW has several different resources regarding wastewater management and treatment, besides trainings and conferences in this area.

Check their website below.

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EPA Homeowner's Guide 

The following resource is a guide on how and why to maintain your septic system, done by EPA.

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Local OWTS Contacts

The Onsite Wastewater Treatment System program operates through each county building or land use planning department. For more information on how to apply for a permit, check a system, or general questions on the rules and regulations for our counties, please check with your county's contact listed below:

Mineral County

Roger Duncan

Mineral County Land Use Office


Mineral County link for OWTS

Hinsdale County

Gabe McNesse

Building Official

970-944-2225 (ext 104)

Hinsdale County Building Dept.

OWTS Fees For Hinsdale and Mineral Counties

For Installers/Cleaners

All contractors are required to have a local permit for OWTS installation and system cleaning. This local permit will cost $25.00 and must be renewed annually. If you hold current NAWT certification, you will not be required to take any additional tests. If you do not have current NAWT certification, you will be required to take an open book test on local Regulation 43.

New System Permit$500.00
System Repair Permit$250.00
Title Transfer Processing Fee$50.00