Urban water management planning.

Existing law, the Urban Water Management Planning Act, requires every public and private urban water supplier that directly or indirectly provides water for municipal purposes to prepare and adopt an urban water management plan and to update its plan once every 5 years on or before December 31 in years ending in 5 and zero, except as specified. Existing law requires an urban water management plan, among other things, to describe the reliability of the water supply and vulnerability to seasonal or climatic shortage, to the extent practicable, and provide data for average, single-dry, and multiple-dry water years. Existing law requires that an urban water management plan provides an urban water shortage contingency analysis that includes, among other things, an estimate of the minimum water supply available during each of the following 3 water years based on the driest 3-year historic sequence for the agency's water supply. This bill would require an urban water supplier to include in its urban water management plan an assessment of the reliability of its water service, as specified, to its customers during normal, dry, and multiple dry years, including a repeat of the 5 consecutive historic driest years the urban water supplier has experienced.