Associations
- Concrete Precasters Association of Ontario
- National Precast Concrete Association
- Ontario Sewer and Watermain Construction Association
- Ontario Municipal Manufacturers & Distributors
- Windsor Heavy Construction Association
- London & District Heavy Construction Association
- Sarnia Heavy Construction Association
- Windsor & District Chamber of Commerce
- Essex County Municipal Supervisors Association
- Essex & Chatham Kent Drainage Association
- Lambton Road Supervisors Association
- Ontario Water Works Association
- The Road Authority
Underground Specialties belongs to the OCTO Purchasing Group.