- Castaic Lake Water Agency - Santa Clarita Valley water supplier provides contacts, conservation tips, and schedule of upcoming meetings.
- Central Basin Municipal Water District - Public agency provides wholesale water and non-potable recycled water to cities, mutual water companies, investor-owned utilities and private companies in the southeast county.
- Foothill Municipal Water District - Public agency supplies recycled, imported (MWD) and ground water to foothill area of the county.
- Las Virgenes Municipal Water District - Provides potable water, wastewater treatment, recycled water and biosolids composting to residents in the cities of Agoura Hills, Calabasas, Hidden Hills, Westlake Village, and unincorporated western areas of the county.
- Los Angeles Department of Water and Power - Public agency supplies electricity and recycled, imported (MWD) and ground water to the county's primary city. Includes information on rebates and programs.
- Three Valleys Municipal Water District - Public agency supplies recycled, imported (MWD) and ground water to eastern areas in the county.
- Upper San Gabriel Valley Municipal Water District - Public agency supplies recycled, imported (MWD) and ground water to northeastern areas in the county. Includes conservation and education information.
- West Basin Municipal Water District - Public agency provides drinking and recycled water; purchases imported water from the Metropolitan Water District of Southern California (MWD) for wholesale in south/west county areas.
