Water ingestion with high concentrations of Arsenic , leads to greater cancer risk than any other common water contaminant. In Nicaragua approximately 55,700 people were ingesting water contaminated by arsenic.  Most of those people lived in scattered small rural communities or were semi-concentrated in municipal and small towns. The aim of this research is to enhance fundamental understanding of Arsenic removal by nanofiltration membranes. These findings will be used to develop an effective and affordable treatment system driven by Human and Solar power for the removal of arsenic in groundwater for rural communities and small towns in Nicaragua.