USEFUL REFERENCES California Landscape Contractors Association (CLCA) The CLCA is a non-profit trade organization of licensed landscape and irrigation contractors and their suppliers. Please visit their site for more information. The Irrigation Association (I A) The IA is a non-profit organization that improves the products and practices used to manage water resources and to help shape the worldwide business environment of the irrigation industry. Please visit their website for more information. The State of California Contractors License Board (CSLB) To find out about becoming a licensed contractor or to see if your current contractor is licensed visit the CLSB at www.cslb.ca.gov.