The State Water Resources Control Board (State Water Board) was created by the Legislature in 1967. The joint authority of water allocation and water quality protection enables the State Water Board to provide comprehensive protection for California's waters. There are nine Regional Water Quality Control Boards (Regional Boards). The mission of the Regional Boards is to develop and enforce water quality objectives and implementation plans that will best protect the State's waters, recognizing local differences in climate, topography, geology and hydrology. The task of protecting and enforcing the many uses of water, including the needs of industry, agriculture, municipal districts, and the environment is an ongoing challenge for the State and Regional Water Quality Control Boards.

Publishes the River and Watershed Conservation Directory, a listing of over 3,500 grassroots river and watershed conservation groups in the US. Listing also includes federal agencies and national nonprofit organizations dedicated to restoring and protecting our waterways.

NOAA Marine Debris Program has led national and international efforts to research, prevent, and reduce the impacts of marine debris. The program also spearheads national research efforts and works to change behavior in the public through outreach and education initiatives.

BlueBarrel is your one-stop shop for do-it-yourself (DIY) rainwater harvesting. They provide the tools, materials, and know-how you need to build your own rainwater catchment system on the cheap!

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

Website offers water conservation, rainwater catchment and greywater information. Also features a virtual "Water Saver Home Tour". MMWD sustainably manages the water supply for ten towns and cities in 147 square miles of south and central Marin County. Volunteer positions are listed on web site under the Jobs at MMWD heading.

The Watershed Agricultural Council (also known as “WAC” or “the Council”) works with farm and forest landowners in the New York City Watershed region to protect water quality on behalf of nine million New York residents.

Provides information, books, products, and services on greywater systems, rainwater catchment, water storage, composting toilets. Website has extensive online info. Publishes the classic guides "Create an Oasis with Greywater" and "Branched Drain Greywater Systems." See the Greywater Central link, under "Browse whole site at a glance—".

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.

A nonprofit whose mission is to preserve the nation's network of estuaries by protecting and restoring the lands and waters essential to the richness and diversity of coastal life.