St. Louis' largest environmental consulting firms

Information on The List was supplied by individual companies and company representatives through questionnaires and could not be independently verified by the St. Louis Business Journal. Local is defined as St. Louis, St. Charles, Lincoln, Warren, Franklin, Washington and Jefferson counties and the city of St. Louis in Missouri; and St. Clair, Madison, Jersey, Clinton, Calhoun, Macoupin, Bond and Monroe counties in Illinois....