An environmental engineer uses engineering principles to protect human health and the natural environment. They design systems that clean drinking water, manage waste, control air pollution, and help communities adapt to challenges like flooding and contamination. About 39,400 environmental engineers work in the United States, earning a median salary of $104,170 per year.
What Environmental Engineers Do
At its core, environmental engineering sits at the intersection of engineering and environmental science. These professionals solve problems that affect the air you breathe, the water you drink, and the land communities are built on. Their work ranges from designing wastewater treatment plants and landfill systems to cleaning up contaminated industrial sites and advising governments on sustainability goals.
A few common responsibilities include:
- Water and wastewater treatment: Designing and overseeing systems that make tap water safe or treat sewage before it returns to rivers and oceans.
- Pollution control: Developing strategies to reduce emissions from factories, power plants, and vehicles, or to prevent chemical runoff from entering soil and groundwater.
- Hazardous waste remediation: Managing the cleanup of sites contaminated by industrial chemicals, oil spills, or decades-old dumping. The federal Superfund program, for example, relies heavily on environmental engineers to assess and restore these locations.
- Environmental impact assessment: Evaluating how proposed construction projects, mines, or developments will affect surrounding ecosystems and recommending ways to reduce harm.
Much of this work is shaped by federal regulations. The Clean Air Act, Clean Water Act, and the Resource Conservation and Recovery Act (RCRA) all set standards that businesses and municipalities must meet. Environmental engineers are the people who figure out how to meet those standards in practice, translating legal requirements into physical systems and measurable outcomes.
Where They Work
Environmental engineers split their time between office desks and the field. Office work involves designing systems using computer-aided design software, running models, and writing reports. Field work means visiting construction sites, treatment plants, or contaminated land to collect soil, water, or air samples and oversee projects in progress. Some also spend time in laboratories analyzing those samples for pollutants.
Employers include consulting firms, government agencies like the Environmental Protection Agency, water utilities, construction companies, and manufacturing plants. A growing number work on renewable energy projects or for companies trying to reduce their carbon footprint.
Tools of the Trade
Environmental engineers rely on geographic information system (GIS) software, particularly Esri’s ArcGIS platform, to map pollution sources, model how contaminants spread through groundwater, and conduct environmental impact analyses. They also use computer-aided design programs to draft treatment systems and infrastructure plans. In the field, they work with water quality sensors, air monitoring equipment, and soil sampling kits. The combination of digital modeling and hands-on measurement is what allows them to move from identifying a problem to designing a solution.
Climate Change and Sustainability
Climate adaptation has become one of the fastest-growing parts of the profession. As droughts grow longer, extreme rainfall events intensify, and sea levels rise, environmental engineers are the ones redesigning infrastructure to handle conditions it was never built for. That could mean upsizing stormwater systems in a city that now faces heavier floods, designing constructed wetlands and marshes to buffer coastal communities against rising seas, or rethinking water supply systems for regions facing prolonged drought.
A key part of this work is figuring out how much extra capacity to build into new infrastructure. Climate projections carry uncertainty, so environmental engineers run cost analyses to determine whether it makes financial sense to oversize a pipe or a reservoir now rather than rebuilding it in 20 years. They also advocate for “green infrastructure,” things like permeable pavement, rain gardens, and restored wetlands, which can be cheaper and more adaptable than traditional concrete-and-steel solutions.
How to Become an Environmental Engineer
The standard path starts with a bachelor’s degree in environmental engineering or a closely related field like civil or chemical engineering. The program needs to be accredited by ABET, the organization that sets quality standards for engineering education in the United States. Some positions, especially in research or specialized consulting, prefer or require a master’s degree.
Licensing follows a three-step process. First, you pass the Fundamentals of Engineering (FE) exam, typically taken right around graduation. Then you accumulate four years of progressive work experience under the supervision of a licensed engineer. Finally, you sit for the Principles and Practice of Engineering (PE) exam in the environmental specialty. Holding a PE license is often required to sign off on designs, submit reports to regulators, or lead projects independently.
Beyond the PE license, the American Academy of Environmental Engineers and Scientists offers a Board Certified Environmental Engineer (BCEE) credential. This is a specialty certification that signals advanced expertise. It requires passing an additional oral examination and peer review process. For professionals who aren’t licensed engineers, the academy offers a parallel Board Certified Environmental Engineering Member (BCEEM) credential with similar qualification standards.
Salary and Job Outlook
The median annual wage for environmental engineers was $104,170 as of May 2024, according to the Bureau of Labor Statistics. Employment is projected to grow 4 percent from 2024 to 2034, roughly matching the average for all occupations. That translates to about 1,500 new positions over the decade, on top of openings from retirements and turnover in the existing workforce of roughly 39,400.
Salary varies significantly by employer type and location. Engineers working for consulting firms or in states with heavy industrial activity or strict environmental regulations tend to earn more. Specializing in high-demand areas like water resources, hazardous waste cleanup, or climate resilience can also push compensation above the median. Experience and a PE license are the two biggest factors that move an environmental engineer from entry-level pay into senior roles.
Environmental Engineer vs. Environmental Scientist
The two roles overlap but differ in focus. Environmental scientists study the natural world: collecting samples, analyzing data, identifying contamination, and advising policymakers on what needs to change. Environmental engineers take those findings and build solutions. They design the treatment plant, the remediation system, or the infrastructure upgrade that actually fixes the problem. Scientists diagnose; engineers prescribe and construct. In practice, many projects require both, and the two often work side by side on the same team.