Uranium

This is the map image layer. The feature layer is available here. The aquifer risk map is being developed to fulfill requirements of SB-200 and is intended to help prioritize areas where domestic wells and state small water systems may be accessing groundwater that does not meet primary drinking water standards (maximum contaminant level or MCL). In accordance with SB-200, the risk map is to be made available to the public and is to be updated annually starting January 1, 2021. This layer is part of the 2022 Aquifer Risk Map. The Fund Expenditure Plan states the risk map will be used by Water Boards staff to help prioritize areas for available SAFER funding. This layer shows water quality risk per square mile section for five individual contaminants: arsenic, nitrate, 1,2,3-trichloropropane, uranium, and hexavalent chromium. The section water quality data is based on de-clustered, depth-filtered water quality results from public and domestic supply wells. This layer contains the long-term average (20 years) as well as the count of recent results (within 5 years) above the MCL, between 80% - 100% of the MCL, and below 80% of the MCL for each square mile section. Detailed methodology can be found [here].