Any company - manufacturer, distributor, freight forwarder, warehouse, terminal, or third party logistics service provider (3PL) - listed as the shipper on the shipping documents for hazardous materials is subject to government regulations and may be responsible for providing an emergency contact number. If your company ships hazardous materials or dangerous goods, it is your responsibility to determine whether the product being shipped is subject to government regulations.
According to the U.S. Department of Transportation regulation 49 CFR § 172.604, "A person who offers a hazardous material for transportation must provide an emergency response number, including the area code or international access code, for use in the event of an emergency involving the hazardous material." Therefore, it is the shipper's responsibility to include an emergency contact telephone number - accessible 24 hours a day - on all hazardous material shipping papers.
Only companies registered with CHEMTREC are authorized to use the CHEMTREC emergency telephone number on their shipping documents and MSDS. Companies and entities that use the CHEMTREC number on their shipping documents without registering with CHEMTREC are subject to significant government fines and penalties.