The Lake County Watershed Protection District measures groundwater levels in the major groundwater basins in Lake County.
Staff measures water wells in seven major groundwater basins in Lake County. These are the wells that are normally measured in April and October of each year to assess groundwater conditions. Based on those measurements, groundwater conditions within each groundwater basin are summarized. These summaries are general statements and due to varying aquifer conditions do not cover all conditions. Individual well owners may experience conditions substantially different than the general condition (some of our wells show markedly different conditions than other nearby wells) and problems are more likely with shallow wells.
Current hydrographs (plots of water level over time) of the wells measured are available here.
Maps of the groundwater basins with measured groundwater levels and summary reports for the last several years are available at the links below.
Twelve wells are measured monthly in Big Valley. Six of the wells are in the western half of the valley and are primarily under the influence of Adobe Creek. Six of the wells are in the eastern half of the valley and are primarily under the influence of Kelsey Creek. The averages of each set of wells are compared to the long term average for the same wells. Charts showing these averages are provided below: