This dataset depicts contours of estimated change in groundwater piezometric surfaces in the unconfined or uppermost semi-confined aquifers, between two specified years, by season. Contours represent change in groundwater level (elevation) by year and season (fall or spring). The contour interval is 10 ft. The contours represent lines of equal change in groundwater level surface. Positive values indicate groundwater has risen (groundwater surface elevation has increased) from the early year to the late year, while negative values indicate groundwater level surface has fallen (decreased in elevation ) from the early year to the late year.Water level measurements used for contouring are selected based on measurement date and well construction information, where available, and approximate groundwater levels in the unconfined to uppermost semi-confined aquifers. For more information on this service, please contact: gis@water.ca.gov

This dataset depicts groundwater level (expressed as elevation in feet amsl) at selected monitoring locations (wells) , by season and year. Other information on the monitoring location is also included. Water level monitoring locations and measurements used are selected based on measurement date and well construction information, where available, and approximate groundwater levels in the unconfined to uppermost semi-confined aquifers. This dataset was created to assist state and local agencies in assessing the status of groundwater levels statewide for recent seasons/years and in relation to other periods. For more information on this service, please contact gis@water.ca.gov

This dataset depicts groundwater level (expressed as elevation in feet amsl) at selected monitoring locations (wells) , by season and year. Other information on the monitoring location is also included. Water level monitoring locations and measurements used are selected based on measurement date and well construction information, where available, and approximate groundwater levels in the unconfined to uppermost semi-confined aquifers. This dataset was created to assist state and local agencies in assessing the status of groundwater levels statewide for recent seasons/years and in relation to other periods. For more information on this service, please contact gis@water.ca.gov

This data set represents the extent of the Central Valley aquifer system in California.

This data set represents the extent of the Northern California volcanic-rock aquifers in California.

This data set represents the extent of the California Coastal Basin aquifers in California.

This data set represents the extent of the Basin and Range aquifers in the states of California, Utah, Arizona, and Nevada.

This dataset depicts groundwater level (expressed as depth below ground surface) at selected monitoring locations (wells), by season and year. Other information on the monitoring location is also included. Water level monitoring locations and measurements used are selected based on measurement date and well construction information, where available, and approximate groundwater levels in the unconfined to uppermost semi-confined aquifers.