The recommendations provided in these key references are sometimes overlooked and wells are installed without regard to the characteristics of the formation, purpose and design objectives of the wells, long-term operability or data quality. Our experience indicates that common well construction practices have drifted somewhat from the detailed procedures of Driscoll and the others. In this chapter, we highlight some of the most important principles in well design, with an emphasis on matching each well’s design and construction to its intended purpose. These issues were developed and emphasized in the references cited above and our aim is to reinforce their importance and provide guidance in the context of remediation hydraulics. We encourage the reader to revisit these topics in the recommended texts, to gain additional background that will further improve the design process.