Army Rocky Mountain Arsenal

What's New?



 RMA to Begin Relocating, Upgrading Portion of Northern Pathway Groundwater Treatment System

Starting in early April, crews will begin installing a small groundwater treatment building, along with several new groundwater extraction wells, recharge trenches and monitoring wells, in an area north of Rocky Mountain Arsenal. The work will take place alng the railroad tracks west of Highway 2 and north of 104th Avenue in Commerce City.

The changes are being made to relocate groundwater treatment facilities from an expiring lease area to an area with a long-term easement. The new groundwater facilities will replace a portion of an existing treatment system and ensure RMA's groundwater cleanup goals continue to be met.

The project, which is being done in cooperation with the EPA, Colorado Department of Public Health and Environment and Tri-County Health Department, will be completed by September 2021. 

To learn more, view the fact sheet, map and schedule. If you have further questions, please contact the RMA Public Affairs Office at 303.289.0300


RMA Conducting 2020 Five-Year Review Process 

 The U.S. Army is in the midst of its Five-Year Review Process for the Rocky Mountain Arsenal.  Conducted collaboratively with the regulatory agencies, FYRs involve a comprehensive assessment of the performance of an environmental cleanup program and its ongoing protectiveness of human health and the environment. 
During the review, a multiagency team evaluates if environmental standards that affect the site have changed in the past five years, whether the cleanup continues to be protective of public health and the environment, and whether the remedy can be expected to remain protective. 
The 2020 FYR, which covers the period from 2016 to 2020, will be the fifth to be completed for the Rocky Mountain Arsenal (RMA).
 Learn more about the 2020 FYR here.

Rocky Mountain Arsenal

6550 Gateway Road

Commerce City, CO 80022-1748

Public Affairs

For further information, contact:


Rocky Mountain Arsenal Wildlife Refuge

Offers year-round wildlife viewing, outdoor recreation and environment education opportunities.  Visit the Refuge online or call 303.289.0930.


Offers year-round wildlife viewing, outdoor recreation and environment education opportunities.  Visit the Refuge online or call 303.289.0930.