Editors' Summary: Regulation of point source discharges under the Federal Water Pollution Control Act (FWPCA) has resulted in significant improvements in water quality. Further progress, however, will require attention to stormwater and nonpoint source discharges. This Article describes current legal schemes that regulate point source stormwater discharges and encourage control of nonpoint source releases. The author first discusses phases I and II of EPA's program to regulate stormwater under the FWPCA.

Water policy in the United States has been significantly influenced in recent years by a number of high-profile environmental and water use conflicts, including disputes relating to California's Bay Delta, Florida's Everglades, the management of the Colorado River system, the Columbia/Snake system, and the Klamath and Trinity River Basins. For a variety of legal, institutional, and financial reasons, the federal government has played a major role in all of these matters, typically in partnership with state and local stakeholders.

One of the most fundamental tenets of toxicology is that "the dose determines the poison." This simple phrase provides the basis for the belief that all agents—chemicals and physical phenomena that are capable of producing some effect—have the potential to cause toxicity. Whether toxicity actually occurs is principally a matter of dose: the greater the exposure to a given agent, the more pronounced or severe the response of a cell or organism.