Water Science for Maryland, Delaware and the District of Columbia
USGS Groundwater Data
Groundwater is water that flows or seeps downward and saturates soil or rock, supplying springs and wells. Groundwater often begins as precipitation and soaks into the ground where it is stored underground in rock crevices and in the pores of geologic materials (these are aquifers), the same way as water fills a sponge. The upper surface of the saturated zone is called the water table.
View Real-Time Groundwater Wells by Region:
The Real-Time Groundwater Level Network contains water level data that is typically recorded every 15-60 minutes, and transmitted to USGS offices every few hours. Transmissions may be more frequent during critical events. * Note: This is provisional data and is subject to revision.