Allegheny County Commission

Allegheny County, Maryland

Andrews, Miller & Associates

Annapolis, Maryland, City of

Anne Arundel County, Maryland 

Archdiocese of Baltimore

Baker Engineers

Baltimore County, Maryland

Baltimore, Maryland, City of

Bel Air, Maryland, Town of

Bowie, Maryland,
City of

BP Oil Company

Calvert County, Maryland

Carroll County, Maryland

Catholic Relief Services (CRS)

Cecil County, Maryland

Center for Watershed Protection

Charles County, Maryland

Charlottesville, Virginia, City of

Chesapeake Bay Foundation

Dewberry & Davis

District of Columbia,
Government of

District of Columbia Water and Sewer Authority (DCWASA)

Dorchester County, Maryland

Eastern Shore Gas

Easton, Maryland, Town of

Fairfax County, Virginia

Frederick Maryland, City of

Frederick County, Maryland

Gaithersburg, Maryland, City of

Garrett County, Maryland

Georgetown University

GDR Data
Resources, Inc.

Goodwill Industries International

GW Stephens Jr. & Associates

Hagerstown, City of

Holland and Knight, LLP

Howard County, Maryland

Howard University

Humanim, Inc.

Isle of Wight County, Virginia

John E. Harms & Associates

Laurel, Maryland, City of

Loudon County, Virginia

Maryland Aviation Administration

Maryland Department of Agriculture

Maryland Department of Assessments and Taxation

Maryland Department of Education

Maryland Department of the Environment

Maryland Department of Natural Resources

Maryland Department of Planning

Maryland State Archives

Maryland State Highway Administration

MDA Federal

Monmouth County, New Jersey

Montgomery County, Maryland

Nature Conservancy, The

National Institutes of Health

National Park Service

New Kent County, Virginia

NOAA

Patton, Harris, Rust & Associates

Prince Georges County, Maryland

Pulte Homes

Richmond, Virginia, City of

Rummel, Klepper & Kahl

Salisbury, Maryland, City of

Somerset County, Maryland

St. Mary's County, Maryland

Takoma Park, Maryland, City of

Talbot County, Maryland

University of Maryland

URS Corp

U.S. Army Corps of Engineers

U.S. Attorney's Office

U.S. Department of Agriculture

U.S. Department of Commerce

U.S. Department of Health and
Human Services

U.S. Environmental Protection Agency

U.S. Fish and
Wildlife Service

U.S. Conference of Catholic Bishops (USCCB)

Verizon Wireless

Washington Gas

Washington County, Maryland

Washington Metropolitan Area Transit Administration (WMATA)

Washington Suburban Sanitary Commission (WSSC)

Wicomico County, Maryland

Worcester County, Maryland