Active intervention of humans in pristine water resource environments has caused both surface and ground waters to degrade in quality and natural purification capacity (Geldreich 1996). Groundwater is often considered to be less impacted than that of surface water due to the absence of climate changes and storm water migrations (Geldreich 1996). Shallow karstic limestone areas (less than 30 m deep) have a greater change of surface contamination since surface water runoff can rapidly percolate through areas lacking a protective bedrock layer.
percolation contamination, microbiological, microbial, human-associated bacteria, coliform contamination, Lechuguilla cave
Hunter, Andrea. "Environmental disturbance of oligotrophic bacteria and effects on water quality in deep karstic pools." (2010). https://digitalrepository.unm.edu/wr_sp/142