United States Code (USC): Arranged topically with 51 titles, there are two annotated versions of the United States Code, United States Code Annotated (USCA—burgundy in color) and United States Code Service (USCS—black). They are produced by different publishers and can differ in the annotations they provide, so it’s a good idea to check both sets.
Some statutes dealing with environmental law issues can be found in Titles 16, 30, 40, and 43. Other statutes may be found elsewhere—use the index volumes at the end of the set to find what you need, or there are volumes listing acts by popular name (National Environmental Policy Act, etc.)
Federal statutory and legislative material can also be found online in the following places:
State codes: Annotated state codes work very much like the federal codes, but may have a different topical organization. For example, in Ohio, statutes dealing with conservation of natural resources are contained in Title 15 of the Ohio Revised Code. The Taggart Law Library has state codes for all 50 states in the state materials section on the south side.
The EPA has helped to create two online tools for locating state environmental agencies, regulations, and other resources:
List of state and territorial environmental agencies, maintained by the EPA.
Links to regulations, agencies, and other resources by environmental law topic and state, created by the National Center for Manufacturing Sciences with the support of the EPA
Lexis, Westlaw, and HeinOnline all provide surveys of environmental laws by topic and state: