In the US, the use of CCA to treat timber for residential use has been banned since December 2003. Timber treated before that date was still allowed to be sold, but retailers were required provide warning labels. Treated timber products already in use, including playsets and decks, were allowed to remain in place. Exceptions to the restrictions were allowed, including the treatment of shakes and shingles, permanent wood foundations, and certain commercial applications. The EPA has also issued regulations for the industrial application of CCA to wood.