http://main.abet.org/aps/Accreditedprogramsearch.aspx lists 67 schools with an ABET-accredited environmental engineering major (although some others may have it as a subarea of civil engineering).
California Polytechnic State University, San Luis Obispo
City University of New York, City College
Clarkson University
Clemson University
Colorado School of Mines
Colorado State University
Columbia University
Cornell University
Drexel University
Florida Gulf Coast University
Florida International University
Gannon University
Georgia Institute of Technology
Humboldt State University
Lehigh University
Manhattan College
Massachusetts Institute of Technology
Michigan State University
Michigan Technological University
Missouri University of Science and Technology (Formerly Missouri University of Science and Technology)
Montana Tech of the University of Montana (Formerly Montana College of Mineral Science and Technology)
New Mexico Institute of Mining and Technology
North Carolina State University at Raleigh
Northern Arizona University
Northwestern University
Oregon State University
Pennsylvania State University
Polytechnic University of Puerto Rico
Portland State University
Purdue University at West Lafayette
Rensselaer Polytechnic Institute
Rutgers, The State University of New Jersey
Saint Francis University
San Diego State University
South Dakota School of Mines and Technology
Southern Methodist University
State University of New York College of Environmental Science and Forestry
Stevens Institute of Technology
Syracuse University
Tarleton State University
Texas Tech University
The Johns Hopkins University
The Ohio State University (Formerly The Ohio State University)
Tufts University
United States Air Force Academy
United States Military Academy
University at Buffalo, The State University of New York (Formerly State University of New York at Buffalo)
University of California Merced
University of California, Irvine
University of California, Riverside
University of Central Florida
University of Colorado at Boulder
University of Connecticut
University of Delaware
University of Florida
University of Georgia
University of Miami
University of Michigan
University of Nevada, Reno
University of New Hampshire
University of Oklahoma
University of Southern California
University of Vermont
University of Wisconsin - Platteville
Utah State University
Wilkes University
Worcester Polytechnic Institute