In recent years, leaking fuel tanks and spills at gas stations have contaminated drinking water sources for nearby communities, and have become costly for owners to clean up. This handbook provides guidance for owners and operators of gas stations on how to protect the environment, comply with federal environmental regulations, and save money by preventing the need for costly cleanups and payment of legal penalties. This guide is especially useful for facilities on tribal lands and in U.S. territories, where federal regulations are sometimes the only environmental rules in effect. This handbook highlights six major areas of environmental management at gas stations: underground storage tanks, aboveground storage tanks, used oil, vehicle waste disposal wells, air conditioning units, and emergency spill response. Each section includes a brief introduction, suggests good management practices, provides a checklist for compliance, and lists EPA contacts for additional assistance.