Rebecca Sutton

SFEI is working with partners across the Bay Area to design tools to help cities achieve biodiversity, stormwater, and climate benefits through multifunctional green infrastructure.

Scientists at the San Francisco Estuary Institute (SFEI) have found a highly toxic tire-related contaminant at levels lethal to coho salmon in stormwater flowing through four sites in the Bay Area. The contaminant, derived from a tire preservative, has been discovered by Washington state researchers to be responsible for high levels of coho salmon deaths in Puget Sound streams. These findings will  inform a petition by state stormwater leaders to the Department of Toxic Substances Control to address pollution of California streams caused by tires.

The research team, led by scientists at the University of Washington and Washington State University, published the results of their investigation yesterday in the journal Science. The chemical, 6PPD-quinone (pronounced "kwih-known"), can wash into streams along with tire wear particles when it rains. Scientists at San Francisco Estuary Institute collected samples from nine Bay Area streams and storm drains during storm events; four contained levels of this contaminant above the concentration at which half the coho salmon die after a few hours of exposure in laboratory experiments. SFEI’s Alicia Gilbreath and Rebecca Sutton are co-authors on the study.

Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are a broad class of fluorine-rich specialty chemicals. More than 4,700 PFAS are used in consumer, commercial and industrial applications, including food packaging materials, waterproof textiles, stain-resistant carpets and furniture, fire-suppression foams, processing aids for the production of fluoropolymers like Teflon, mist suppressants in metal-plating, and hydraulic aviation fluids. Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) have been shown to be highly toxic and have been phased out of production in the US.

The California Ocean Protection Council (OPC), in close partnership with the State Water Board, has recognized the importance of standard methods for trash monitoring and has funded this project. The Southern California Coastal Water Research Project (SCCWRP) and San Francisco Bay Estuary Institute (SFEI) have partnered up to test multiple trash monitoring methods with a goal of developing a library of methods with known levels of precision, accuracy, and cross-comparability of results, and linking these methods to specific management questions.

Contaminant Data Display and Download Tool or CD3  is an innovative visualization tool for accessing water quality data for the San Francisco Bay-Delta and northern montane regions. It is the primary tool for accessing and downloading the San Francisco Bay Regional Monitoring Program’s (RMP) long-term dataset and other project data stored in SFEI's Regional Data Center (RDC).

A state-of-the-science review of current-use pesticides in wastewater, led by SFEI senior scientist Dr. Rebecca Sutton, indicates this pollution pathway is significant and should not be overlooked. The book chapter provides a comprehensive conceptual model of all types of pesticides that have the potential to be washed down the drain and into wastewater. Conventional wastewater treatment technologies are generally ineffective at removing pesticides, so additional monitoring and modeling studies are needed to guide efforts to prevent pesticide pollution.

As a result of summary information presented in the latest Pulse of the Bay (see below), the San Jose Mercury News published an article based on a RMP study of pesticide movement through Bay Area wastewater treatment plants.  Fipronil is an insecticide that is of moderate concern for the Bay because levels in sediment are in the range of toxicity thresholds for freshw

Rebecca Sutton, Meg Sedlak, and Diana Lin of SFEI, in partnership with Carolynn Box of 5 Gyres, conducted ocean water sampling associated with an ambitious project. The project is focused on determining the characteristics and fate of microplastics in the Bay and adjacent ocean waters. KQED reporter Lindsey Hoshaw published a story covering the team's activities along the California coast. After determinng that the Bay has greater than expected microplastic pollution, the science team, as reported by Hoshaw's story, is conducting further ground-breaking research.

When it comes to plastic pollution, that candy wrapper half buried in the dirt is only the tip of the iceberg. Plastic bags, cigarette butts, and bottle caps are not just an eyesore, but over time they break down in the environment, creating small pieces of debris known as microplastics. Microplastics can include anything from synthetic fibers of clothing to industrial pellets from the plastic manufacturing process. Microplastics are now ubiquitous in our environment--found in our air, drinking water, sediment, and in the San Francisco Bay and global ocean.     

The Regional Monitoring Program for Water Quality in San Francisco Bay is an innovative collaboration of the San Francisco Bay Regional Water Quality Control Board, the regulated discharger community, and the San Francisco Estuary Institute. It provides water quality regulators with the information they need to manage the Bay effectively. The Program issues a report each year, the Pulse of the Bay in odd years and the RMP Update in even years.

This study used non-targeted analysis, a powerful tool that provides a broad, open-ended view of thousands of synthetic and naturally-derived chemicals simultaneously. We identified hundreds of contaminants, and the results have opened our eyes to urban stormwater runoff as an important pathway for emerging contaminants to enter the Bay.

Plastic pollution is gaining global recognition as a threat to the resilience and productivity of ocean ecosystems. However, we are only just beginning to understand the scope and impacts of microplastic particles (less than 5 mm) on coastal and ocean resources, and the San Francisco Bay Area is no exception. A preliminary study of nine water sites in San Francisco Bay, published in 2016, showed greater levels of microplastics than the Great Lakes or Chesapeake Bay.

The RMP has conducted initial studies of microplastic pollution in San Francisco Bay. Findings from a 2015 screening-level RMP study of microplastic pollution in our Bay show widespread contamination at levels greater than other U.S. water bodies with high levels of urban development, the Great Lakes and Chesapeake Bay. Wildlife consume microplastic particles; ingestion can lead to physical harm, and can expose aquatic organisms to pollutants like PCBs that the plastics have absorbed from the surrounding environment.

More than 100,000 chemicals have been registered or approved for commercial use in the US. For many of these chemicals, major information gaps limit evaluations of their potential risks, and environmental monitoring of these chemicals has not been required by regulatory agencies. Nevertheless, researchers and government agencies have begun to collect occurrence, fate, and toxicity data for a number of these chemicals.

The RMP Annual Meeting is held every year in the early fall. The meeting is an opportunity for RMP stakeholders to discuss current RMP projects and highlight interesting new research. 

SFEI senior scientist, Dr. Rebecca Sutton, published a new study in the journal Chemosphere showing that it will take almost 50 years for PFOA concentrations in water to stabilize in San Francisco Bay. This pales in comparison to the trajectory of PFOS concentrations that will not stabilize in sediment and fish for 500 years. PFOS and PFOA are harmful to humans, causing liver damage, endocrine disruption, fertility decrease, and cancer.

Concurrent with a sold-out symposium on Oct 2nd, several media outlets, including the Mercury News, San Francisco Chronicle, and Los Angeles Times, have released the articles relating the alarming findings regarding the pervasive presence of microplastics in our surface waters. The issue of microplastics is global in nature. However, the advances in understanding the magnitude of the problem are happening regionally through partnerships with 5 Gyres, the University of Toronto Trash Team, and other notable leaders.

The short (3-min) video summarizes the goals of the SF Bay Microplastics Project, which aims to better understanding the distribution of microplastic in San Francisco Bay and adjacent National Marine Sanctuaries, the pathways by which these contaminants enter the Bay, and possible means of controlling their release. 5 Gyres and San Francisco Estuary Institute are collaboratively carrying out the project.

Matt Simon from Wired Magazine writes:

San Francisco Bay, like Monterey Bay to its south, is a rare success story in ocean conservation. In the 1960s, three grassroots activists—Sylvia McLaughlin, Kay Kerr, and Esther Gulick—launched Save the Bay, which beat back developers trying to fill in parts of the iconic body of water.

Maanvi Singh from the US edition of the Guardian, based in the UK, writes, “It was basically everywhere we looked,” said Rebecca Sutton, an environmental scientist at the San Francisco Estuary Institute, a local institution that led the three-year, $1.1m research effort.