The Friends of the San Dieguito Rivery Valley is one of several groups focused on the preservation of the river valley and its resources. Other stewards include:

San Dieguito River Valley Regional Open Space Park Joint Powers Authority is a single-purpose government agency authorized by its member agencies, the County of San Diego, and the cities of Del Mar, Escondido, Poway, San Diego, and Solana Beach, to create a greenway and open space park in the river valley. Information: 858-674-2270

The San Dieguito River Valley Conservancy is a 501(c)(3) non-profit organization established to locate and develop sources of funds for land acquisition, secure gifts and bequests of land and money, and work with other public and private organizations to acquire land. Information: 858-755-6956

The Lagoon Committee of the City of Del Mar is charged with monitoring the preservation and enhancement of the portions of the San Dieguito and Penasquitos Lagoons located in the City of Del Mar, and also any actions outside the City of Del Mar that impact the lagoon systems within the City of Del Mar. Information: 858-755-9313

The San Dieguito Lagoon Auxiliary provides educational resources to promote the protection, preservation, and restoration of the natural environment and wildlife of the lagoon, and the river valley on which it depends.