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Nammo Defense Systems | Hazardous Waste Site


Nammo Talley Inc.
4051 N Higley Rd, Mesa, AZ 85215

Discovery Date:

January 1996

Contaminants of Concern (COCs):

  • Lead
  • Perchlorate
  • Volatile Organic Compounds (VOCs)
  • 1-4 Dioxane

Affected Media:

  • Soil
  • Groundwater
  • Vapor Intrusion (VI)  

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 > 

For Vapor Intrusion (VI) | There is little to no risk of vapor intrusion unless your residence or workplace is immediately above subsurface pollutants that evaporate at room temperature and has a direct pathway to indoor air.

Site Summary:  

  • Corrective Measure Study (CMS) submitted in March, 2017 showed perchlorate, lead and VOCs that have migrated offsite in groundwater and stormwater runoff

Corrective Action:

  • Extensive soil removal has been performed and has not resulted in the site meeting closure criteria
  • Down gradient plume has not yet been characterized
  • ADEQ informed Salt River Pima-Maricopa Indian Community (SRPMIC) regarding investigation and remediation options
  • ADEQ informed SRPMIC primate research facility tenant (Univ of WA) regarding groundwater quality
  • ADEQ developed contingency plan for responding to elevated contaminant levels in primate research facility wells
  • Permit application for ongoing closure/post-closure/corrective action was submitted and is being processed