Environmental Council of the States (ECOS) - national, non-profit, non-partisan association of state and territorial environmental commissioners. 

US Environmental Protection Agency USEPA Home Page

EPA's SW-846 Online Test Methods for Evaluating Solid Waste Physical/Chemical Methods - all approved methods and draft update IV are available as Adobe Acrobat files.

USEPA Office of Water/Wetlands Home Page

US EPA Envirofacts - a relational database that integrates data extracted from five EPA program systems: Envirofacts Aerometric Information Retrieval System (AIRS) Facility Subsystem (EF AIRS/AFS), Comprehensive Environmental Response, Compensation and Liability Information System (CERCLIS), Permit Compliance System (PCS), Resource Conservation and Recovery Information System (RCRIS), Toxic Release Inventory System (TRIS), and the Locational Reference Tables (LRT)

US Department of Energy Home Page

USDOE Comprehensive Epidemiologic Data Resource

US Geological Survey Homepage

The FEDERAL REGISTER(FR) Environmental Subset

Occupational Safety and Health Administration (OSHA)

Congressional Record 

Fedworld Gateway

Air and Waste Management Association

American Society of Civil Engineers

American Water Works Association

New England Interstate Water Pollution Control Commission

Northeast Business Environmental Network - WWW Interactive Site through the cooperative efforts of EPA, OTA, and The Massachusetts Toxics Use Reduction Institute (University of MA: Lowell)

Southern California Chinese American Evironmental Professional Association (SCCAEPA)

Public Interest

The Sustainable Development Institute - principal activities include the Community Forestry Policy Project, an effort to strengthen the role of local communities in forest management and Atlantic CoastWatch, a monitoring and reporting service for the Atlantic Community.

Nicholas School of the Environment at Duke University 

Biological Effects of Low-Level Exposure (BELLE) - disseminates information on the appropriateness of various proposed dose-response curves for low-level exposure to chemicals and radioactivity.

EcoIQ 

Envirolink

Environmental Organization Webdirectory - a comprehensive environmental organization search engine.

Extension Toxicology Network

The Green University Initiative