The districts may acquire, construct, operate, maintain, and furnish facilities for the diversion of urban runoff from drainage courses within the districts, the treatment of the urban runoff, the return of the water to the drainage courses, or the beneficial use of the water.
Source:
Section 35539.12, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=WAT§ionNum=35539.12..