Jerash refugee camp is one of the ten official Palestinian refugee camps located in Jordan. It is inhabited by about 28,000 people who originally fled from Gaza, Palestine, in 1968, as a result of the 1967 Arab-Israeli war. Wastewater has been used for irrigation in Jordan for several decades. Some treated effluent has been used directly on restricted crops of relatively low value, but the main practice has been to discharge effluent to the environment where it mixes with freshwater flows before being used downstream. This article presents the results of an assessment of health risks related to exposure of children in Jerash refugee camp to greywater that runs openly in small ditches in roads between the houses in the camp.