Understanding the origin of geogenic solutes (dissolved chemical elements unaffected by human activity) in groundwater has broader implications than a traditional water resource investigation. Humans evolved over millions of years drinking water from springs and seeps within a narrow range of solute compositions and concentrations as did nearly all terrestrial animals, fish, and plants. Accordingly, it is incumbent upon us to sustain this critical solute balance as we utilize this resource. That is best achieved through knowledge of its origin and the mechanisms controlling its ionic concentration and composition. This monograph is written for those individuals who wish for conceptual exposure to groundwater geochemistry. The first five chapters are largely descriptive outlining basic geochemistry conceptually the last three chapters use some simple mass balance techniques to help evaluate potential sources of solutes and use them to address physical aquifer properties.