Geo-Synthetics, Inc. (GSI) 2401 Pewaukee Road , Waukesha , 53188 Environmental XPRT Downloads About Solutions products industries services Publications videos Downloads Home Companies Geo-Synthetics, Inc. (GSI) Locations Geo-Synthetics, Inc. (GSI) Show or hide locations in map Headquarters Office locations Locations served Distributors Manufacturer Geo-Synthetics, Inc. (GSI) Headquarters 2401 Pewaukee Road Waukesha Wisconsin 53188 Phone/Fax Number