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McKinley Mill Mine (Wetland Mine)
Location:
Bradshaw Mountains, approximately 8 miles southeast of Prescott, off Walker Road, Yavapai County
Date Discovered:
September 2000
Impaired Surface Waterbody:
Hassayampa River
Surface Water Quality Exceedances for Designated Uses:
- Cadmium (aquatic and wildlife, coldwater)
- Copper (aquatic and wildlife, coldwater)
- Lead (aquatic and wildlife, coldwater and full body contact)
- Zinc (aquatic and wildlife, coldwater)
Affected Media:
- Soil
- Surface Water
What Are My Health Risks?
For Surface Water | Surface water quality standards are established to provide protection for a waterbody’s designated use(s) | Learn more >
ADEQ and AZGFD jointly publish fish consumption advisories | Learn more >
For Soil | There is little to no health risk unless there is contact with skin or ingestion of contaminated soil
For Groundwater | 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 >
For Mining Adits/Shafts | If you encounter a mining adit or shaft, do not enter it. The Arizona State Mine Inspector conducts inspections of legacy mines and implements safety measures | Learn more >
Site Summary:
- Site was mined intermittently in late 1800s
- ADEQ completed water quality study (Total Maximum Daily Load) for Hassayampa River in 2002
- ADEQ contractors conducted a site assessment and preliminary investigation in 2019
- ADEQ conducted water quality sampling and remedial implementation in fall 2020
- Initial soil XRF analysis completed on Oct. 9, 2020
- Remediation contract awarded to Tetra Tech
- Remediation work completed in winter 2021
- ADEQ conducting effectiveness monitoring to determine remediation success
Surface Water Quality Standards in Arizona Administrative Code, Title 18, Chapter 11 >