St. Mary's Landfill

To ensure the safety of the public and the environment by monitoring, managing, and controlling landfill gas and site safety.

425 N. Grande Ave

Waste Acreage

Operation Dates
1963 - 1973

Monitored Only Site

Groundwater Protection Project

Annual Budget
approximately $20,000

City of Tucson - Environmental Services 520-791-3175


St. Mary’s Landfill is located at Menlo Park near Grande Ave and St. Mary’s Rd. The landfill was used for the disposal of Class II trash and debris consisting primarily of green waste and construction debris. Today the City monitors 29 landfill gas probes on a quarterly basis, and inspects the landfill annually for erosion and other potential issues.

Additional Info
Evaluation of historical operational records from the landfill indicates that it is a low future environmental risk.

Inspections, Landfill Gas Monitoring

Last Update
Monday Jul 1, 2019

View this project on the Environmental Management Projects Map

Project Details


  • October-December
    The City is scheduled to conduct an annual closed landfill inspection. A report will be prepared following this inspection documenting the site conditions.
  • January, April, July, & October
    The City conducts quarterly landfill gas monitoring at perimeter probes during these months every year to monitor for methane migration at the property boundary.
  • March 2011
    The City completed the Comprehensive Landfill Investigation and Closed Landfill Inspection reports. This landfill is discussed in both of these reports. These reports are available in the report/attachment section of this website.
  • 1995-1998
    The City installed shallow landfill gas monitor probes to monitor methane concentrations between the landfill and nearby businesses and began routine monitoring.


  • St Mary's Landfill exists underneath the open field at Menlo Park.


  • 2015 Annual Closed Landfill Inspection
    This report documents the annual landfill inspection activities conducted at St. Mary's Landfill on October 1, 2015.
  • Closed Landfills Inspection and Maintenance Report
    The City of Tucson - Environmental Services owns and maintains fifteen closed regulated and non-regulated landfills. This guidance report provides the procedures for inspecting and maintaining those landfills. The text portion of this report is available at this link. To review the full document contact the Environmental Services office at 520-791-3175.
  • Comprehensive Landfill Investigation Final Report
    The City of Tucson, Environmental Services began the Comprehensive Landfill Investigation in 2000 to evaluate groundwater quality downgradient of landfills owned or operated by the City of Tucson which are not regulated by Sate or Federal Agencies. This is the final report. The text portion of this report is available at this link. To review the full document contact the Environmental Services office at 520-791-3175.