Editors' Summary: Drainage from farmland is a major source of water pollution in the United States, but is largely unregulated under the Federal Water Pollution Control Act. In this article, Professor Davidson analyzes why this is an improper reading by the Environmental Protection Agency of the 1977 amendments to the FWPCA, and why new provisions in the 1987 legislation codifying the exclusion are bad policy and destined to create confusion. As this article goes to press, the 1987 amendments to the FWPCA have passed both houses of Congress, but presidential action is uncertain.