This guidebook has been written to assist urban water agencies with understanding and successfully administering CII conservation programs in accordance with the CII BMP. The intended audience is the Water Conservation Coordinator responsible for implementing the BMPs. It describes programs and practices to be implemented with CII customers. Program examples and references are included to assist coordinators in developing and implementing successful programs within their service areas. Commercial, Institutional, and Industrial water demands make up a large percentage of total demand for California (see Figure 1, in the section on Identifying CII Customers). CII water use varies dramatically between business sectors as well as within a given water agency’s territory, making conservation outreach, education, and implementation efforts more involved than similar programs in residential sectors. Best Management Practices (BMPs) within the CII sector should implement comprehensive yet flexible strategies, allowing an agency to work with businesses to tailor the implementation of each practice to fit local business needs and opportunities. The end result is a practice that is successful and will produce the greatest amount of cost-effective water savings.