Many developing countries are about to prepare their new strategies on how to achieve the Sustainable Development Goals (SDGs) for universal and equitable access to water and sanitation by 2030.These new roadmaps need to put a focus on rural growth centers and small towns where the majority of those without access to water and sanitation reside. In 2015, a third of the global rural population was living within the service area of a small piped water scheme mainly operated by water users association. These schemes are generally ill-maintained and ill-managed. Recent experiences in seven developing countries (Bangladesh, Cambodia, Colombia, Niger, the Philippines, Senegal, and Uganda) have shown that domestic private sector participation (DPSP) is an effective and proven approach to address challenges in small towns' water and sanitation services delivery. The report aims at helping national and local governments in developing countries and water professionals to better engage with the domestic private sector in the provision of sustainable water and sanitation services in rural growth areas and small towns.