Sustainable Washington Alliance

Network of individuals, businesses, and organizations working to create a sustainable future for the region.
http://www.swampnet.org/

Metropolitan Washington Environmental Professionals

Local affiliate of the National Association of Environmental Professionals.
http://mwep.org/

HowStuffWorks: Exploding Manholes

Information on the frequent mishaps under the streets of the city.
http://www.howstuffworks.com/exploding-manhole.htm

Environmentors

Committed to helping one hundred public high school students create opportunities for brighter futures through mentorship, educational enrichment, and the fostering of a sense of environmental stewardship.
http://www.environmentors.org/DC.htm

Biodiversity Database of the Washington, D.C., Area

Searchable database of information and images. Includes organisms and regional nature and preservation areas in the D.C. area.
http://biodiversity.georgetown.edu

Earthquake History of the District of Columbia

Seismic history of DC from the National Earthquake Information Center.
http://neic.usgs.gov/neis/states/district/district_history.html

Casey Trees Endowment Fund

A project to restore the tree canopy of Washington, DC, administered by the Garden Clubs of America. Includes a review of the street tree inventory carried out in 2002.
http://www.caseytrees.org/

Washington, D.C. Natural History Bibliography

Bibliography of books, articles, and other resources on the natural history of Washington, D.C. Compiled by Ryan Shepard.
http://www.lisnews.com/ryan/bibliography.html

Friends of the Earth DC Environmental Network

A consortium of conservation organizations that meets regularly to focus on environmental problems specific to the region, exchange information, and coordinate strategies. Includes background documents [PDF].
http://www.foe.org/camps/reg/dcen/

Maryland-National Capital Park and Planning Commission

Acquires, develops, maintains and administers a regional system of parks in Montgomery and Prince George's Counties in Maryland.
http://www.mncppc.org/

DC Department of Health - Environmental Health Administration

Works to prevent and control environmentally related diseases while protecting and preserving the ecological system in the district. Features a guide to the bureaus and divisions that make up the Administration.
http://dchealth.dc.gov/about/index_environmental.shtm

Earthjustice - Washington DC

Focused on ensuring that national clean water and clean air standards are properly set and enforced in the District. Features urgent cases, opportunities for action, legislative information, news and campaigns.
http://www.earthjustice.org/regional/washington_dc/

The Nature Conservancy - Maryland/District of Columbia

Works to protect critical natural lands. Features places protected, events, news and volunteer opportunities.
http://nature.org/wherewework/northamerica/states/maryland/

Trash Force

Volunteer group that picks up trash and recyclables from public areas every other weekend. Features FAQ, news, awards, volunteer opportunities and articles.
http://home.sprynet.com/~pnahay/tforce.htm

Flora of the Washington-Baltimore Area

Offers information about flora native to the area. Includes a specimen database, projects, spring flowering records and a gallery.
http://www.nmnh.si.edu/botany/projects/dcflora/

DC Greenworks

Non-profit organization supports projects and provides information on low-impact storm water management and urban forestry. Includes information on green roofs, rain gardens, and tree care.
http://www.dcgreenworks.org/

Hardy Palm Trees and Ferns

Showcases plants that can survive the area's often snowy winters.
http://www.wap.atfreeweb.com/Palmdc/

Pre-Columbian Society of Washington, DC

Promotes interest in Pre-Columbian cultures through annual symposia, monthly meetings, and a newsletter. Includes newsletter index.
http://www.pcswdc.org/

DC Energy Office

Promotes energy efficiency through conservation, education, and fuel assistance programs and by regulatory intervention. Includes consumer information, a description of agency programs, a guide to resources in its library, an events calendar, and links to
http://www.dcenergy.org/

Washington Regional Network for Livable Communities

Advocates "smart-growth" transportation investments, land use policies, and community designs. Includes newsletter archive and policy documents.
http://www.washingtonregion.net/

Urban Land Institute

Non-profit research and education organization focusing on the use of land to enhance the environment.
http://www.uli.org//AM/Template.cfm?Section=Home