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Page-Trowbridge Ranch Landfill | Hazardous Waste Site


Page-Trowbridge Ranch Landfill
One mile north of State Hwy 77 (approximately seven miles west of Oracle)
Pinal County, AZ

Discovery Date:


Contaminants of Concern (COCs):

  • Volatile organic compounds (VOCs)

Affected Media:

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

Site Summary:  

The site is a hazardous waste landfill owned by the University of Arizona (UArizona) consisting of two landfill units: Unit A to the north and Unit B to the south. Chemical and low-level radioactive laboratory waste were disposed of at the site. All disposal activities ceased in 1986. The landfills (Unit A & B) were capped and certified closed in 1997. The landfills have four onsite groundwater monitoring wells which are sampled semiannually. An onsite soil vapor extraction system operates to capture any vapors found below the landfill cells. The landfills are subject to a hazardous waste permit issued in 2001 and renewed in 2011.

Corrective Action:

  • Soil Investigation Workplan – July 2002
  • Interim measure investigation – November 2003
  • Interim response action 
  • Post-Closure Permit

More Information

For more information on this site, contact UArizona's Chief Risk Officer or ADEQ site manager:

UArizona Chief Risk Officer | 520-621-1790 | Email >

ADEQ Hazardous Waste Permits | 602-771-4123 | Email >