Must a residential development be at least 500 units before triggering the water supply assessment or verification requirements?
Both SB 221 and SB 610 apply to a 500 unit residential development OR a project that would increase the number of the public water system’s existing service connections by 10%. Under Water Code ยง 10912(a)(7), SB 610 would also apply to a “project” that “would demand an amount of water equivalent to, or greater than, the amount of water required by a 500 dwelling unit project.” In order to determine whether an assessment will be required under the 500 unit equivalency threshold, the city or county would need to work with the water supplier to determine if the demand associated with a proposed project would be equivalent to or greater than the demand for a 500 unit project in that jurisdiction. This could include a water intensive project of less than 500 residential units, depending on how the local agencies define the typical water demand for a 500-unit residential project.
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