ABSTRACT
Water required for various purposes may come from groundwater or surface resources such as lakes, reservoirs, and rivers. It is called untreated or raw water and is usually transferred to a treatment plant. The degree of treatment depends on the raw water quality and the purpose for which that water will be used. Different water quality standards for domestic, industrial, and agricultural purposes are presented in Chapter 9. After treatment, the water usually enters a water distribution network. Details of the facilities required for water distribution are presented later in this chapter.
