Environmental engineering is a professional engineering discipline related to environmental science. It encompasses topics like chemistry, biology, ecology, geology, hydraulics, hydrology, microbiology, and mathematics to create solutions that protect and improve the health of living organisms and the quality of the environment. Environmental engineering covers wastewater management, water and air pollution control, recycling, waste disposal, public health, design of water supply and wastewater treatment systems, hazardous-waste management, and environmental impact assessment.