This site lists jobs in several states as well as having multiple good links to other sites. This page focuses on environmental jobs in the U.S. and Canada. Includes various listings of jobs, research opportunities, and seminars. You can submit resume and application on line and search many links. This site contains an index of job listings.
Users can register for free for two weeks.
Most are in Florida. Involved, then on Professional Opportunities. The public bulletin board has job listings. All government pages ultimately send you to this site which has employment information for all departments. This page lists over 15 in depth career descriptions.