In much of the American West, water districts dominate water governance. These districts serve vitally important functions in regions challenged by aridity, growing populations, and climate change. These districts also often operate within boundaries developed a century ago, or more, and under governing rules that are undemocratic by design. In many water districts, people who do not own land cannot serve on the governing board. Nor can they vote in water district elections. … This article describes these problems. Drawing on original data and mapping, it shows how pervasive these undemocratic governance structures can be and how water districts with these structures are expanding their reach into new policy realms. It also explains continued problems with the geography of water districts. And it shows how some water districts have acted to thwart important state policy interests and why such conflicts are likely to increase.