California’s Surface Water Ambient Monitoring Program (SWAMP) is a comprehensive monitoring program designed to assess the quality of the beneficial uses of the State’s water resources. SWAMP objectives include 1) surveying each hydrologic unit in the State at least once every five years, 2) using consistent sampling methods, analytical procedures, data quality objectives, and centralized reporting requirements, 3) analyzing spatial and temporal trends in water quality statewide, and 4) evaluating waterbodies based on water quality standards and available data. Two types of monitoring are conducted under SWAMP: ambient monitoring, in which waters are surveyed without bias to know impairment, and site-specific monitoring, in which problem sites or clean sites (reference sites) are characterized. The Los Angeles Regional Water Quality Control Board (LARWQCB) has developed an ambient monitoring program that obtains site-specific information while still encompassing regional ambient monitoring goals. Ultimately, this data will allow the LARWQCB to answer the following questions: • What is the percentage of streams or waterbodies in a watershed o
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