River Network: State-by-State Look at the Clean Water Act http://www.riverwatch.org/cleanwater/cwa_search.asp - A step-by-step process to access information related to the Clean Water Act in each state.
EPA Office of Water http://www.epa.gov/water/
National Library for the Environment (NLE) and Congressional Research Service (CRS) http://www.ncseonline.org/NLE/CRS/ - The CRS is part of the Library of Congress and prepares its reports for the U.S. Congress. The NLE currently posts 1328 CRS Reports on environmental and related topics.
Legal Information Institute of Cornell Law School http://www.law.cornell.edu/index.html - This is a user-friendly tool for finding specific sections of the US Code. Acts can be searched by title, but it is more convenient when the exact title and section are known.
Thomas Legislative Information http://thomas.loc.gov/ - This is an excellent resource for keeping in tune with recent legislative actions. Using Thomas, you may track the history of bills before Congress as well as legislation enacted into law.
Federal Register http://www.gpoaccess.gov/fr/index.html - the Federal Register is the official daily publication for rules, proposed rules, and notices of Federal agencies and organizations, as well as Executive orders and other Presidential documents.
Regulations.gov http://www.regulations.gov/ - Regulations.gov is the U.S. Government web site to facilitate participation in Federal rulemaking. On this site, you can find, review, and submit comments on Federal documents that are open for comment and published in the Federal Register.
The Law Engine http://www.thelawengine.com/ - Links to online legal sources including Federal Courts, Federal Law, Federal-State Cases/Laws, State Law and Courts, Law Libraries, Legal Reference, Newspapers, Government Agencies, Publications, Legislative Action, etc.