The increase in population and urbanization increases the de- mand for food. As discussed in the following section, urban wastewater is vital for agriculture in many areas. However while many urban centres in developing countries have house- hold sewer connections, these often discharge, in combination with storm water, into open drains that flow untreated into lo- cal waterways. Local governments do not have the resources to build collection and treatment facilities so that untreated water is used in peri-urban agriculture.