This report, written in collaboration with Indepth Precision Consulting, Nigeria, presents a detailed description of the baseline data collected as part of the Formal Research Component of WaterAid UK's Project “Sustainable Total Sanitation Nigeria -implementation, learning, research, and influence on practice and policy" (STS Nigeria), funded by the Bill and Melinda Gates Foundation. WaterAid Nigeria (WANG) is undertaking this project through its implementing partners, Local Government Areas (LGAs) as well as Non-Governmental Organisations (NGOs), in three Nigerian states: Jigawa, Ekiti and Enugu. WANG's objective is two-fold: (i) to increase the demand for private sanitation solutions and their usage by households and (ii) to foster the supply of better quality private sanitation solutions that meet the local needs at a more affordable price, in rural communities. In order to achieve this, WANG is implementing two distinct but closely connected and expected to be complementary interventions: Community-Led Total Sanitation (CLTS), which is a community mobilization intervention, and Sanitation Marketing (SanMark), which targets suppliers of sanitation materials.