From 1972 to 1995, gravity irrigation (flood, furrow and so on) has decreased by about 20% on an acreage basis, while sprinkler irrigation has increased by about 8% and microirrigation, including drip and microsprinklers, has increased by about 12%. These statewide estimates exclude rice acreage and are based on surveys commissioned by the California Department of Water Resources and the U.S. Bureau of the Census. Irrigation districts, UCCE farm advisors and specialists, the Natural Resource Conservation Service (NRCS) and the U.S. Bureau of Reclamation (USBR) were other sources of information. Different irrigation methods have different implications for crop yield, water conservation and water-quality protection. With the advent of chemigation and fertigation, future surveys should collect information about both irrigation and associated agricultural chemical practices.