Well construction data from domestic and public-supply wells in the Central Valley were compiled from the California State Water Resources Control Board Division of Drinking Water (CADDW), the Department of Water Resources (CADWR), and the United States Geological Survey (USGS). Additional wells in the Central Valley were compiled by recording water use and depth to the top and bottom of well screens from CADWR drillers logs. Interpolated GIS raster surfaces were created using Empirical Bayesian Kriging on a 1600 by 1600 m (1 square mile grid). Predicted values for well screen tops and bottoms were computed, as well as 10th and 90th quantile values. The surfaces produced by this process may also be used to calculate volumes of water-supply in the Central Valley defined by the tops and bottoms of the well screens.