Headquartered in Santa Rosa, Calif., Winzler & Kelly is a full-service engineering and environmental consultancy firm. It specializes in a range of design, planning, permitting, modeling and program management services. It also offers a variety of biological services, including wildlife studies, permit scheduling, fish passage design, wetland delineations, and plant and animal surveys. Additionally, the company offers real estate development planning, tax and financial analysis, economic development consulting and site evaluation services. It specializes in hazardous material site investigations and provides solutions for soil and groundwater contamination. In addition, the company operates an in-house survey department that offers a variety of surveying services, such as aerial mapping, construction staking, and topographic, hydrographic and boundary surveys. It has received various awards at the local, regional and national levels.