Aaron's Rain Barrels

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.

American Rivers

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

Aquabarrel

Online source for rain barrels. Aquabarrel's rain barrel designs are developed by actual users of rain barrels. In-Stock rain barrels range in size from 30 gallons to 214 gallons. Carries downspout filters, downspout diverters, first flush roof washers, and mosquito control products too. Offers inexpensive parts kits (drill bits included) for making your own rain barrel.

American Rainwater Catchment Systems Association

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

Ace Rain Systems, Inc.

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.

American Tank Company

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

Bolsa Analytical Lab

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.

Bill Wilson - Environmental Engineering

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

Association of California Water Agencies (ACWA)

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.