The element boron has has played a significant role in our watershed. The history and concentration levels of boron in Clear Lake, Bear Creek and Cache Creek is discussed in "Natural Background Levels of Boron in the Clear Lake-Cache Creek Watershed." To access this report, please click here.
Local water quality issues, and the factors that influence water quality constituents including boron are discussed in the 2006 report "Boron, Salinity, Nutrients and Dissolved Oxygen in the Irrigation Water within the Yolo County Flood Control & Water Conservation District." To access this report please click here.
The average concentration of nitrate in the District's surface water irrigation supplies is 0.4 mg/l as Nitrate as N. More information regarding nitrate in Cache Creek surface water can be found in the fact sheet: "Nitrate in the Surface Water Supplies of Cache Creek" by clicking here.