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U.S. Army Garrison Yuma Proving Ground – Muggins Mountain | Hazardous Waste Site


U.S. Army Garrison Yuma Proving Ground – Muggins Mountain
T7S R20W, S12 — (approximately 23 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:  

Muggins Mountain is a former open burning/open detonation (OBOD) and disposal site located south of the YPG KOFA range. The site is 390 acres and consists of three areas: the peripheral area, the Burial Trench Area, and the former-OBOD units. The permittee was directed to install an onsite groundwater monitoring well downgradient of the site. As a result of the investigations conducted to date, U.S. Army Corps of Engineers has issued a formal determination that there is a high probability that munitions and explosives of concern (MEC) remain in place as the site.

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 Investigation (RFI) report completed  August 2014
  • Interim measures including surface clearance sufficient to permit the installation of an onsite groundwater monitoring well – report submitted April 2018