Environmental engineering is a professional engineering discipline that takes from broad scientific topics like chemistry, biology, ecology, geology, hydraulics, hydrology, microbiology, and mathematics to create solutions that will protect and also improve the health of living organisms and improve the quality of the environment.Environmental engineering is a sub-discipline of civil engineering , chemical engineering and mechanical engineering. Environmental engineers devise solutions for wastewater management, water and air pollution control, recycling, waste disposal, and public health.They design municipal water supply and industrial wastewater treatment systems,and design plans to prevent waterborne diseases and improve sanitation in urban, rural and recreational areas. They evaluate hazardous-waste management systems to evaluate the severity of such hazards, advise on treatment and containment, and develop regulations to prevent mishaps. They implement environmental engineering law, as in assessing the environmental impact of proposed construction projects.