On July 19, the DoE issued a final notice of determination requiring states to review their energy efficiency codes for residential and commercial buildings, and potentially update them. Under a final determination on low-rise residential buildings, states will be required to file certification statements with DOE to show that efficiency provisions in building codes comply with the 2009 edition of the International Code Council's International Energy Conservation Code (2009 IECC) by July 19, 2013. On July 20, DoE released a separate final notice of determination, states are required by July 20, 2013, to provide certification to DOE that they have reviewed energy efficiency provisions in their commercial building codes and updated their codes “as necessary” to comply with or exceed standards published in 2007 by the American National Standards Institute. Under the Energy Policy Act, states are required to adopt commercial energy building codes that achieve equivalent energy saving as model codes. Compliance among states has historically been sporadic.