This report draws together the insights on drilling on groundwater and drilling from 181 participants that were shared on the 2018 and 2019 UNDP Cap-Net/Skat Foundation courses entitled Professional Management of Water Well Drilling Projects and Programmes. The report provides insights into groundwater dependency, self-supply, groundwater data, siting, supervision, procurement and contract management, the institutional and legal framework, and the drilling industry from over 50 countries.