Landfill Cleanup

Cleanup of the Cave Creek Landfill site has been approved by the Arizona Department of Environmental Quality and it is underway.

Please read the fact sheet (PDF) and the Remedial Action Plan (RAP) (PDF) document if you would like more information than what is provided in the "Background" and "Plan Phases" sections below.


The groundwater is not a drinking water source, but the Remedial Action Plan (RAP) (PDF)can give you more detail as to why Maricopa County and the state feels it is important to clean the site. The county has been monitoring the site since the late 90s for a common solvent often dumped in older landfills, known as TCE. We have detected vapors in the soil and in the groundwater 600 feet below the ground surface. This groundwater is not currently used a drinking source, but we want to protect it for future use. The contaminated area is spreading south from the old landfill at approximately 6 inches per year.

Plan Phases 20180307_VicinityandPipelineMap

The approved Remedial Action Plan has led the county to drill wells in strategic areas around the landfill. Some of these are for monitoring water quality while others will pull contaminated water to the surface where it will be filtered and cleaned in a Groundwater Treatment System. 

The well planned for 4050 E Sleepy Ranch Rd in Summer 2018 is an injection well. Water cleaned in the Groundwater Treatment System will be piped to the injection well site and pumped deep below the surface to return clean water to the aquifer and slow the migration of contaminated water towards water supply wells.

The site will be operational around April, 2019. Routine visits will take place on weekdays with little noise outside the walls on the property.

It is important to understand this is a long-term project. Please see phase details for more information.

Phase Details

20180306_Wall-Rendering-Looking-NW-from-Sleepy-Rnch-Rd(Conceptual rendering of wall and access gate on injection well property.)

Phase One
Expected Construction Time: November, 2018

Wall construction begins. Every effort will be made to restrict equipment and parking to the property.

Phase Two
Expected Construction Time: January through April 2019

A truck mounted drilling rig will drill, develop and test the well. The company uses sound barriers to reduce noise and light pollution, but the drilling portion of this work will be a noisy operation for three to four weeks, 24 hours per day. We apologize in advance for the disturbance.

drilling-example(Typical well site during well installation.)

Well-Site-Layout-Map(Planned injection well site layout.)

Phase Three
Expected Construction Time:  Spring 2019

An eight inch diameter pipe will be run from the Groundwater Treatment System to the injection well in your neighborhood. Access to your property will be maintained. The construction will only take place during the day, but there will be times where traffic flow is interrupted. The crews will take all necessary safety precautions to cover trenches and direct traffic.

Phase Four
Expected Construction Time: Fall 2019

Construction at the well site begins. A pump is installed along with all the mechanical and electrical components. This will take a small number of people and every effort will be made to keep activities within the walls on the property.


(Typical wellhead piping at an injection well site.)


Please send an email with any additional questions.