During the 1980s and early 1990s, the US Environmental Protection Agency proposed to reform federal environmental regulation around “risk management” principles that stressed pollution prevention, better priorities, and cost control. In spite of the fact that risk management were strongly supported by three successive presidential administrations, only one major federal statute – the Safe Drinking Water Act (SDWA) Amendments of 1996 – was developed around these principles. The purpose of this paper is to understand why Congress succeeded in reforming the SDWA around risk management principles at a time when legislative reform of other federal pollution control policies remained stalled. Through a historical analysis of federal drinking water politics between 1970 and 1996, it is concluded that the somewhat unique politics surrounding the drinking water issue enabled risk management principles to serve as a “persuasive discourse” that bound together key interests within the policy community.