Studies that have examined watershed groups have lacked the analysis of an empirical national data set to account for the factors that affect watershed groups growth and variation. This has made it difficult to assume any particular relationship between the presence of watershed groups and any environmental, social or political factors. Most of the work that has been done to measure watershed groups' presence relies on regional cases and survey data. This study takes a step further and uses a large panel of data for 1,570 watersheds in the US to establish a framework of all the environmental, social and political factors that may have an impact on watershed groups' presence. Building on a methodological framework and using longitude data on a watershed level, the model uses two-stage least square estimation with endogenous water quality. The results suggest that watershed groups presence is positively correlated with waterbodies listed for impairment, number of endangered species, proportions of rural areas, population density, and percentage of population with college degree. Yet, other factors that are also accounted for this study have negative impact on watershed groups presence.