<prompt> Problem village is all exceptNo water source in a distance of 1.6 km from communityWater is more than depth of 15 metresThere is excess of Na, K and Flouride saltsRisk of Guinea worm infection  <response>: A problem village has been defined as one where no source of safe water is available within a distance of 1.6 km or where water is available at a depth of more than 15 metres or where water sources has excess of salinity, iron,flouride, and other toxic elements or where there are exposed to risk of cholera. Risk of guinea worm infection is not a criterion for problem village. Ref: Park;s textbook of preventive and social medicine.K Park. Edition 23. Pg no: 476 