What types of wells and springs are sampled?
Most network sites (wells and springs) draw water from unconfined aquifers (aquifers lacking a protective confining layer) including the crystalline-rock aquifers of the central Maryland Piedmont, limestone aquifers (Hagerstown and Frederick Valleys), and the surficial aquifer of Maryland’s Eastern Shore. Most network wells are private water wells or observation wells (wells drilled specifically to observe water-level fluctuations).