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Aquifer map & monitoring

Piedmont and Blue Ridge crystalline-rock aquifers

This is a regional body of water-bearing rock or sediment—not an underground lake. The mapped shape shows the shallowest principal aquifer where it reaches the surface or lies beneath shallow deposits. It does not show the full underground extent.

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Groundwater levels at monitoring wells

128 wells are shown here. Individual well measurements describe a site, not one aquifer-wide water level.

Monitoring coverage is not a measure of groundwater availability or quality. Check USGS for current monitoring records.

National code

N400PDMBRXUSGS National Water Information System reference

Wells within the mapped area

128 wellsWells inside the mapped boundary; they may not represent the whole aquifer

Rock or sediment

Igneous and metamorphic-rock aquifersAlabama, Delaware, District of Columbia, Georgia, Maryland, New Jersey, New York, North Carolina, Pennsylvania, South Carolina, Tennessee, Virginia, West Virginia

What the wells can say

What well measurements tell us

A water level at one well can be compared with that well’s own usable history. It does not establish aquifer-wide condition, storage, depletion, or available supply.

Coverage, not condition

46 wells with usable history

Knowing a well has a measurement series is not enough to show a trend. We check the individual measurements and time span before calculating seasonal comparisons.

Monitoring locations

Explore individual wells

Sources and map limits

Geography: U.S. Geological Survey principal aquifers (2003). Codes: USGS National Aquifer Code Reference List. A well inside this mapped boundary does not necessarily draw from this aquifer. Well-construction records are needed to confirm which aquifer it reaches.