Groundwater levels
Detailed Description
USGS serves data from almost 1 million groundwater monitoring wells!
Groundwater levels can be measured from ground level (land surface datum, or LSD) or from standardized datums, such as the North American Vertical Datum of 1988 (NAVD88).
USGS Monitoring location pages show groundwater levels from LSD and provide information (and sometimes data) for other datums.
Checkout current or historic groundwater levels near you with the National Ground-Water Monitoring Network.
Sources/Usage
Public Domain.