3 pp. / This is a section of the "Arizona Well Owner's Guide to Water Supply" already peer reviewed and published by CALs - - we are pulling out short topics from the booklet for 'fact sheet' publication and distribution. This is NOT applicable to eXtension as it is Arizona specific and not applicable to anything outside the state. / Arizona has stringent permit requirements for the construction of water wells, but domestic well owners are responsible for repair and maintenance of their own wells to assure a reliable water supply of consistent quality. For the proper maintenance of domestic wells, it is important to have a basic understanding about the different materials that comprise a home water supply system. This fact sheet presents information about Arizona domestic well components, including well casings, well caps, well screens, and pitless adapters; basic materials that combine with a pump to provide water for a household.