The greatest difficulties in providing ground-water monitoring installations have not generally resulted from a need to develop new technologies but from the need to define and implement the administrative and communicative procedures that are required for legal and fiscal control. Many of the required field procedures that must be understood by permit writers and their inspectors have never been researched and documented but exist as evolved in day-to-day geotechnical practice and water well contracting. The field solution usually requires the selection of the appropriate available installation procedure. Selection of the well casing, intake screen, and sampling device according to material constituents is currently the most “unsettled” aspect of ground-water monitoring practice. It is emphasized that the field installation of a monitoring well system must relate to the site geology and hydrology, and that each ground-water monitoring device must be installed using the most appropriate drilling tools and techniques, and well materials, according to the suspected contaminants and the required accuracy of analysis.