LAFAYETTE, Ind. - Wabash National Corporation (NYSE: WNC), a diversified industrial manufacturer and North America’s leading producer of semi-trailers and liquid transportation systems, has received certification of the ISO 14001:2004 registration at its Portland, Oregon, operation.  The company’s Portland operation manufactures Beall brand petroleum and dry bulk tank trailers. This is the Portland facility’s first ISO certification. The ISO 14001:2004 standard, published by the International Organization for Standardization, is an international reference for environmental management requirements. “Achieving ISO 14001:2004 certification at our Portland operation reflects the importance Wabash National puts on upholding environmental standards at each of our manufacturing operations,” said Brent Yeagy, president and chief operating officer. “I applaud our Portland associates for their commitment to sustainability and for reaching this significant milestone in manufacturing excellence.” The ISO 14001:2004 standard provides organizations with the elements of an effective environmental management system that can be integrated with other management requirements to help them achieve environmental and economic goals. The overall aim of this International Standard is to support environmental protection and prevention of pollution in balance with socio-economic needs. Wabash National currently has ISO 14001:2004 registrations at five other locations: Lafayette and Frankfort, Ind.; Harrison, Ark.; Cadiz, Ky.; and San José Iturbide, Guanajuato, Mexico. In addition to the ISO certification, the Portland operation also received a Sustainability at Work certification in May from the City of Portland for demonstrating best sustainability practices in recycling, energy use and water use. The certification requires compliance with at least 12 of the city’s listed sustainable actions. Sustainable actions practiced at the Portland facility include use of high efficiency fluorescent lightbulbs, recycling scrap metal and wood, and setting water heaters to 120 degrees or lower.