This article concludes a series that provides producers with information to help with on-farm management of phosphorus (P) and in understanding the complex economic and environmental issues involved in P management. This article discusses potential regulatory action and offers options to help producers move toward compliance. Iowa has many water quality challenges. It may be helpful to take a step back from the science of water quality and review the politics of water quality. What are some potential regulations and what can producers do to be in compliance?