This chapter develops and presents a model of state choice in the Clean Water State Revolving Fund (CWSRF) program. Based on the extant literature on both the CWSRF and water quality policy more generally, a model is presented that includes elements of state implementation choice in program structure and operation, initial state sufficiency of program resources, and state commitment to water quality. Control variables in the model include a series of demographic variables, political variables, and a measure of water quality need. The dependent variables in the model are measures of the distribution of program resources for different categories of program recipients, as indicated by the dollar value of loans, and the percentage of total loans, to each category of recipient. The recipient categories includes program resources to communities with significant environmental need, communities with populations less that 10,000 residents, and communities facing financial hardship. Finally, a fourth category represents the number (and percentage) of loans made by a state for nonpoint pollution needs.