DC Department of Energy and Environment (local government, not federal) is hiring entry-level and supervisory positions. DC Government has been doing some work in air quality, water quality, solar energy, stormwater, and environmental policy. Check back periodically to see what jobs are available, currently they just posted a few positions working in air quality monitoring and assessment. Jobs can be found here: https://careers.dc.gov, check the "Dept of Energy and Environment" box under "AGENCY".