This guidebook is the result of working with agencies in the water sector over the past several years. Although water and wastewater utilities are intimately familiar with the requirements to meet their missions, whether delivering safe drinking water or treating wastewater and meeting discharge requirements, they are often much less familiar with other environmental regulations such as those governing the management of hazardous waste. Furthermore, most agencies do not have a person, much less a department, dedicated to ensuring environmental compliance. Therefore, the need for a guidebook such as this became apparent, and through the support of the American Water Works Association (AWWA), Water Utility Council (WUC), and the Water Industry Technical Action Fund (WITAF), it became a reality. Additionally, AWWA's legal advisors reviewed the guidebook to ensure it accurately describes and references the regulatory requirements. Water is a vital resource that no one can live without. Assisting utilities in complying with environmental regulations to minimize their risk is critical to ensure that resources available for capital improvements and other projects will enable facilities to fulfill their mission.