This document discusses corruption risks in the water sector and provides examples. It begins by distinguishing between grand corruption, which involves larger sums but is less frequent, and petty corruption, which is more frequent but involves smaller sums. The document then notes that corruption risks depend on the water sub-sector, stage of service delivery, and types of actors involved. An exercise follows that maps potential corruption risks across water supply and sanitation, water resource management, and irrigation sub-sectors based on public-public, public-private, and public-consumer "interfaces". The document concludes by noting corruption in the water sector hurts the poor the most.