Treated wastewater effluent is discharged into the Los Angeles River from the nearby L.A.-Glendale Water Reclamation Plant. Water-quality managers for the effluent-dominated river are exploring the potential ecological and recreational effects of diverting effluent and runoff from the river for water recycling purposes.


This map showing extrapolated bioassessment data for the Malibu Creek watershed reveals the estimated ecological condition of stream reaches throughout the watershed. Triangle designate bioassessment sampling sites, and the size of the colored circles indicates confidence in the modeling’s estimates. Additional extrapolation maps are being developed for modified streams in California.

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SCCWRP and its partners are exploring the spatial extent to which ecological condition scores calculated for sites in engineered and modified channels, including the Los Angeles River, above, may be extrapolated to upstream and downstream reaches.


A SCCWRP field crew collects algae samples in the Santa Margarita River, which spans Riverside and northern San Diego Counties. The State Water Board has published draft versions of a suite of technical reports, journal manuscripts and tools co-authored by SCCWRP that will serve as the technical foundation for developing a statewide policy that protects the biological integrity of wadeable streams from the impacts of eutrophication and other stressors.


The physical habitat of the North Fork of Riverside County’s San Jacinto River is characterized by boulders, woody debris and diversity of substrate particles. A new scoring tool enables watershed managers to quantitatively assess the physical habitat condition of such sites.