To ensure the safety of the public and the environment by monitoring, managing and controlling landfill gas and site safety.
3200 S. Cottonwood Ln
Monitored Only Site
Groundwater Protection Project
City of Tucson - Environmental Services 520-791-3175
The Cottonwood Landfill is generally located 0.5 mile north of Ajo way and 0.5 mile west of Interstate 19. This landfill was used for the disposal of municipal solid waste. Quarterly the City monitors sixteen shallow landfill gas probes at the property boundary and annually inspects the landfill.
Nitrate has been detected in the groundwater at concentrations above the regulatory standard. The nitrate is likely the result of historic and present land practices of nearby properties (i.e. crop land, horse stables, and septic systems) and because it is not a landfill contaminant, the City is not investigating it. If you have a private groundwater production well and live near this area, you should have your well tested for nitrates. The drinking water supplied by Tucson Water for this area meets all drinking water regulations, including nitrate.
Inspections, Landfill Gas Monitoring
Monday Jul 1, 2019
View this project on the Environmental Management Projects Map
The City conducts an annual closed landfill inspection during this period. A report documenting site conditions will be prepared following the inspection. The latest report is available in the Attachments/Reports section of this website.
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.
June 21, 2010
The City completed the Groundwater and Soil Vapor Monitoring report for 2009. As discussed in this report, monitoring of three groundwater monitoring wells and one deep nested soil vapor monitoring well was discontinued since soil vapor and groundwater quality data collected from 2001 -2009 indicated that there were no impacts to groundwater due to the landfill. The City will reevaluate the landfill conditions annually and resume monitoring if necessary. This report is available in the report/attachment section of this website.
The City installed three groundwater monitor wells and one deep soil vapor monitoring well and began routine monitoring.
The City installed shallow landfill gas monitor probes to monitor methane concentrations between the landfill and nearby homes and began routine monitoring.