Online seller of affordable rain barrels that connect directly to your rain gutters' downspout tubes, have threaded brass spigots and overflows (for garden hose). They sell exclusively online (to cut out the middleman) and offer free, fast shipping (to anywhere in the U.S). They can create custom designs.

BAWSCA represents the interests of 25 cities and water districts, and two private utilities, that purchase water wholesale from the San Francisco regional water system. The entities provide water to 1.7 million people, businesses and community organizations in Alameda, Santa Clara and San Mateo counties.

Leads conservation efforts to restore and preserve rivers for future generations.

Promotes rainwater catchment systems in the United States through educational opportunities and the exchange of information at Web site and nationwide workshops.

A rainwater catchment installation company that offers seamless gutters, rain barrels, large capacity tanks, pumps, filters, rain chains, and more. Will assess your roof system and help you to determine whether you can harvest potable water or if it's best to create a system for plant watering. Proposals are offered free of charge for clients in San Diego area.

A California-based manufacturer and retailer of water storage tanks.

A water, soil and food testing lab. Samples can be either brought in or collected by the lab. Water tests offered: Microbiology, Inorganic Chemistry, and Toxic Chemical Elements.

Environmental consultant who offers comprehensive environmental planning and engineering, wastewater and water quality planning.

Largest statewide coalition of public water agencies in the US with over 430 members. Represents over 90% of water used in California. Promotes best water management practices via research and advocacy. ACWA’s involvement at the state and federal level has helped shape laws and policies that affect ACWA member agencies and their customers. Check their website for upcoming workshops, seminars, and other ways to get involved.