Revised On: Mar. 27th, 2025 - 03:40 pm
Environmental Protection Agency (EPA) #: AZD008399263
Superfund National Priority List (NPL) Placement: Aug. 30, 1990
Location
The Apache Powder Superfund Site is located approximately seven miles southeast of the incorporated town of Benson and two-and-a-half miles southwest of the unincorporated town of St. David in Cochise County, Arizona. Study area covers approximately nine square-miles and includes 1,600 acres of land owned by Apache Nitrogen Products Inc. (ANPI), formerly known as the Apache Powder Company. The San Pedro River bounds the eastern side of the site, running from the southeast corner of the property toward the northwest | View Map >
Contaminants of Concern (COCs)
Groundwater | Nitrate and perchlorate
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 >
COCs at the site may change as new data become available.
Action Taken
Northern Area Groundwater
- Bioremediation activities ongoing, including Operation and Maintenance (O&M) in accordance with the EPA approved modified O&M plan of 2020
Southern Area Groundwater
- Explanation of Significant Differences (ESD) #4 closed remedy of monitored natural attenuation (MNA), and retains long-term groundwater monitoring and Institutional Controls in 2017
Contaminated Soils
Status
Ongoing remedial work continues at the site.
Northern Area Groundwater
- Currently updating the O&M Plan and data provided in an annual O&M report to EPA and ADEQ this summer. This site is subject to a programmatic five-year review and the next review will be conducted in 2027.
Southern Area Groundwater
- Currently data is provided in an annual report to EPA and ADEQ this summer. This site is subject to a programmatic five-year review and the next review will be conducted in 2027.
Learn more about this Superfund site on the EPA website | View >
