For purposes of this chapter, the following definitions apply:
(a) “Dry weather runoff” has the same meaning as defined in Section 10561.5.
(b) “Local agency” includes, but is not limited to, a city, county, special district, joint powers authority, sanitary district, sanitation district, county sanitation district, community services district, and municipal utility district.
(c) “Municipal wastewater agency” means a local agency that chooses to exercise any authority granted under this chapter.
(d) “Stormwater” has the same meaning as defined in Section 10561.5.