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Spatial Coverage
- Maryland[remove]261
- Virginia41
- West Virginia24
- Pennsylvania22
- Delaware20
- Montgomery County9
- Fairfax County5
- Maryland.4
- Washington (D.C.)4
- Arlington County3
- Charles County3
- District of Columbia3
- Chesapeake Bay Region (Md. and Va.)2
- Frederick County2
- Loudoun County2
- Magothy Aquifer2
- Patapsco Aquifer2
- Prince George's County2
- Prince Georges County2
- Allegany County1
