Environmental engineering is a broad topic. The breadth of environmental engineering topics includes chemistry, biology, ecosystems, air quality, hydraulics, hydrology, and groundwater. Environmental engineering topics also include highly engineered systems such as drinking water treatment and wastewater treatment. Other topics that may not be as intuitive, like air quality and built environment, also incorporate fundamental concepts of environmental engineering. With such a diverse range of topics, it is not surprising there are almost limitless applications of sustainability in environmental engineering. The environmental engineering topics discussed above are key to the United Nation’s 2007 eleven indicators from the Commission on Sustainable Development’s Sustainable Development Goals, including poverty, health, atmosphere, oceans, fresh water, and economic development. These indicators can be demonstrated through the close examination of four specific topics within environmental engineering: Low impact development, drinking water treatment, outdoor air quality, and coastal resilience. These four topics will be discussed in detail in this chapter.