E. Tetz & Sons Inc. Share: Sand and Gravel E. Tetz & Sons Inc. Visit Website Request Info 801 Route 17B Mongaup Valley, NY 12762 (845) 794-8065 (800) 736-1336 (845) 794-0210 (fax) Facebook About Map About E. Tetz and Sons, Inc. and Tetz Asphalt, LLC, is a family owned and operated construction materials supplier for the Hudson Valley and surrounding areas for over 40 years. What's Nearby? Distance: 5 10 15 20 25 50 mi.