A compilation of physiological and ecological parameters and toxicity data for a number of California fish and wildlife species.
Ecotoxicology
The mission of the Ecotoxicology Program within the Office of Environmental Health Hazard Assessment (OEHHA) is to advance the science and practice of ecological risk assessment (ERA). We focus on developing tools and technical resources to assess the impacts of chemical, physical, and biological stressors on ecosystems. Our current focus is on aquatic ecosystems.
Our Program was established in 1993 with the goal of applying tools from the developing field of human heath risk assessment to address the risks caused by chemicals on California’s ecosystems. In 1998, the US EPA adopted a set of Guidelines for “evaluating the likelihood that adverse ecological effects may occur or are occurring as a result of exposure to one or more physical, chemical, or biological stressors”. ERA is based on a simple three-step process which includes a) identifying the problem or stressor(s) of concern, b) analyzing the stressors by characterizing their exposure and ecological effects, and c) characterizing risk using a variety of methods. The work of the OEHHA Ecotoxicology Program is currently focused on applying this approach to understanding risks to the State’s aquatic resources.
To inquire about our Program, contact barbara.washburn@oehha.ca.gov
Reports, Notices, Documents
A fact sheet describing Oregon's dry well program. Oregon's program is the most well developed in the country.
OEHHA, the City of Elk Grove and a team of hydrologists are studying the potential environmental risks associated with the use of dry wells. The project aims to determine whether dry wells in combination with other low impact development (LID) practices are a cost-effective way to infiltrate stormwater and recharge the aquifer- without negatively affecting groundwater quality.
Extensive list of external sources of information for ecological risk assessment provided for informational purposes.
OEHHA is assisting the Dry Creek Conservancy (DCC) and the American Basin Council of Watersheds to gain a better understanding of the stressors in the Dry Creek watershed that have contributed to salmon declines over the past two decades. OEHHA is collecting environmental data and is using the Stressor Identification (ID) method developed by the US Environmental Protection Agency to identify impacts of urbanization and causes of impairment to the health of the watershed.
Impervious surfaces impact the hydrology, water quality and aquatic and riparian habitat within a watershed. OEHHA has developed impervious surface coefficients useful in stormwater management runoff analyses, in watershed assessment as an indicator of watershed health, and in land use planning to identify areas of higher or lower imperviousness and opportunities to reduce impervious cover.
General information and technical resources that provide information to scientists in local public health and natural resource agencies, as well as the public, about microcystins and risks associated with exposure to this family of toxins.
Toxicity tests are an important component for assessing the impact of chemicals on ecosystems. Two documents are provided to give an overview of the numerous standardized toxicity test protocols. The soil toxicity guidance document also reviews bioassessment tools and methods that can play a critical role in the ecological risk assessment process.
The Ecotoxicology Program works with state, local, and non-governmental partners to develop informational literature, tools, and technical resources to promote a better characterization and understanding of the link between land use and aquatic resources protection.
OEHHA has been working with the California Water and Land Use Partnership to educate land use decision makers and their staff about the link between land use and natural resource protection.