Basic Equipment Lists (BELs)


‚ÄčThe Basic Equipment Lists (BELs) have been developed to provide Colorado county assessors with a guide to help them identify and uniformly value oil and gas (O&G) equipment across the state. The BELs identify equipment common to each particular type of well by basin. Considerations include depth, production level, and method of production. In addition, three valuation grids are provided for each BEL to ensure that the equipment condition, depth, and production are appropriately taken into consideration. The Additional Installed, Communal Equipment, and Stored Equipment Lists are designed to account for equipment not included in the BELs or not installed at a well site. BELs are available in PDF format as well as a downloadable excel format.

Downloadable Excel Files

Disclaimer: Published versions of the 2023 BELs, Additional Installed, Stored Equipment and Communal Equipment Lists, found in Assessors' Reference Library Volume 5, are in PDF format with rounded whole-number values. The individual cells of the following Excel versions contain actual decimal values. Please be aware that any formulaic calculations in Excel or other software, may vary from calculations using the PDF versions.

The Division of Property Taxation will not be liable for the use of, or any errors resulting from the use of, the these electronic versions of the BELs or associated lists. Additionally, since the files are not security protected and therefore changeable, the Division of Property Taxation will not be held liable for any information or the use of such information contained in such files.


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