San Mateo Creek Basin

The San Mateo Creek Basin (SMCB) comprises approximately 321 square miles within the Rio San Jose drainage basin in McKinley and Cibola counties, New Mexico. This basin is located within the Grants Mining District (GMD).  

The 85 legacy uranium mines with recorded production and 4 legacy uranium mill sites comprising the GMD may have contributed to degradation of ground water quality within the San Mateo Creek Basin. Some background ground water contaminant concentrations associated with remediation of the Homestake Mining Company (HMC) Superfund Site exceed federal and state drinking water standards as well as state ground water standards.

As a part of ongoing assessment efforts within the SMCB, EPA has designated a specific area, called the Central Study Area (CSA), for investigation and study. Information on the CSA can be found here. 

The table below is sortable by document title, geographical subarea, county, year, and tribal or non-tribal status.