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U.S. Army Garrison Yuma Proving Ground – KOFA Range | Hazardous Waste Site


U.S. Army Garrison Yuma Proving Ground – KOFA Range
T5S R19W, S30 and 31, approximately 28 miles northeast of Yuma
Yuma, AZ  85364

Discovery Date:


Contaminants of Concern (COCs):

  • Perchlorate
  • Munitions constituents, including: 2,4-DNT, 2,6-DNT, nitroglycerin, octogen (HMX), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX)
  • Nitrate
  • Volatile organic compounds (VOCs)
  • Semi-volatile organic compounds (SVOCs)
  • Heavy metals (lead, arsenic, barium)

Affected Media:

  • Soil
  • Groundwater

What are My Health Risks: 

For Soil | There is little to no health risk unless there is contact with skin or ingestion of contaminated soil.

For Groundwater | If you are connected to a public water system (PWS) there is little to no risk of impact from exceedances because the water is filtered through the PWS for residential and business use. | View Drinking Water Notices > 

If you have a private well in the vicinity of the exceedance, we encourage you to test the well water.
Not sure what to test for?
Learn More > 

Site Summary:  

The KOFA Range is an active military munitions range on the Yuma Proving Ground that includes the Munitions Treatment Facility (MTF), an area designated for demilitarization and treatment of unused munitions. The MTF is permitted to treat hazardous waste and routinely treats unused munitions by open burning (OB) and open detonation (OD). Currently, the MTF has two active OB units and five OD units. Four former treatment units located at the MTF called the “Inactive Treatment Units” have recently been closed. As part of corrective actions, YPG is also investigating six areas identified as potential solid waste landfills. These landfills are being closed with RCRA Subtitle D covers.

This hazardous waste site is also listed as a Federal Department of Defense (DOD) Site on My Community | View Federal Department of Defense (DOD) Sites Page >

Corrective Action:

  • RCRA Facility Assessment, April 1999
  • Closure of “Inactive Treatment Units”, March 2014
  • Closure of historic landfills, June 2017
  • Closure of former north open burn pad, March 2014
  • Closure of former south open burn pad, April 2018