Summarize the following:
By the time you obtain state licensure as an environmental engineer, you will already have several years of work experience under your belt.  With licensure, however, your opportunities will likely grow substantially, and a new survey of your options may be in order.  Consider moving to a state that employs many environmental engineers. For example, large numbers of environmental engineers find work in Massachusetts, while New Mexico and Alaska’s engineers tend to get the highest average wages. Inquire with the companies that you worked for during engineering co-op programs or internships. People inside the company can vouch for your work ethic and experience, and you may have an easier time landing a competitive job. Apply for work with the federal Environmental Protection Agency (EPA), or a state or local agency with a similar focus. Renew your application regularly if you don’t get a job when you first apply. Look for jobs on specialized websites, for instance the American Academy of Environmental Engineers and Scientists (aaees.org). The engineering field is always changing as new technologies, regulations, problems, and solutions emerge, so it is important to stay on top of things in order to advance your career.  For instance, the explosive growth in natural gas drilling using hydraulic fracturing (or “fracking”) has created new challenges (and new job opportunities) for environmental engineers.  Some states may require continuing education credits or some other form of evidence that you remain up-to-date with the profession in order to retain your license. The AAEES website is a good starting point for recent publications and other information regarding environmental engineering (http://www.aaees.org/). After you become a professional engineer, you can apply to the National Society of Professional Engineers or the American Academy of Environmental Engineers and Scientists for board certification.  A professional certification can help you network and improve your credentials as you look for senior engineering jobs. AAEES certification, for instance, requires a combination of testing, work experience, proof of ongoing professional development, valid licensing, and “high ethical integrity.”  Contact the organization for more specific information on the certification process.

Summary:
Study the job market. Remain engaged within the profession. Seek board certification.