Many developing nations face drinking water shortages, and municipal water rationing has become increasingly common in large urban centers. In Accra, Ghana, this has led to substantial variation in service levels among residential customers at a geographic scale that is too fine to be captured by top-down water service reports issues by local Water Districts. Household surveys that collect basic water service metrics have demonstrated the potential to better inform service providers, but are increasingly cost-prohibitive to implement in a resource-constrained setting. Improving Quality of Urban Water Service by Engaging SMS Technology (IQUEST) is an open source tool for geographic decision support that allows crowd sourced water data to be collected and analyzed to improve water service quality.