“…Similar to previous studies (Almasri andKaluarachchi, 2003, 2005;Almasri, 2007;Fallahzadeh et al, 2016;Gallagher and Gergel, 2017), this study aimed at predicting groundwater nitrate concentrations in a region of mixed land uses to control the environmental quality. As very few studies (Hu et al, 2005;Li et al, 2014;Al-Kalbani et al, 2017) have spatially linked groundwater nitrate concentrations to land use, land cover, our work provides an important approach that is highly relevant to other regions facing similar management challenges. Accordingly, the objectives of this study were to analyze the extent of nitrate concentration in groundwater in the Southern High-Plains and Edwards-Trinity aquifers of Texas in the USA and to identify land uses that have significant impacts on nitrate concentrations of groundwater using multivariate statistical analysis and geographically weighted regression (GWR) models in the Southern High-Plains and Edwards-Trinity aquifers in Texas.…”