Water Supply Assessments is an analysis of a specific project demand for short-term and long-term water usage. Pursuant to California Senate Bill (SB) 610 and SB 221 (2003), and in concurrence with California State Water Code § 10912- § 10912, a Water Supply Assessment is required when a project would demand an amount of water equivalent to, or greater than, the amount of water required by a 500 dwelling unit project. It is generally acknowledged that one acre-foot of water can serve two to three households on an annual basis; therefore, one dwelling unit typically consumes .3 to .5 acre-feet of water per year, depending upon several factors, including the regional climate. The local water supplier should be contacted to find out the annual water demand for a development within the local community in order to determine whether the water demand for the development under consideration is equivalent to the water demand of a 500 dwelling unit project.
Water Code § 10912 (a)(7) While Water Code § 10912(a) provides that a “project” may include a residential development of 500 or more dwelling units, Water Code § 10912(b) provides a “sliding scale” for determining the size of a project to which SB 610 would apply, below 500 dwelling units. Since Section 10912(b) provides that a “project” is a proposed development that would increase the number of service connections for a public water system (which currently has fewer than 5,000 service connections) by 10 percent or more, a “project” could be as few as 300 dwelling units.
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