Starting in 1819, there was heavy traffic on the Singapore River due to rapid urbanization and expanding trade. At the same time, it brought in water pollution caused by the disposal of garbage, sewage and other by-products of industries located along the river's banks. The sources of water pollution into the Singapore River and Kallang Basin included waste from pig and duck farms, unsewered premises, street hawkers and vegetable whole sellers. Riverine activities such as transport, boat building and repairs were also found along the Singapore River.