I believe 10 states have already passed legislation, based on the 0.5% maximum limit, with an implementation date of July 2010. I believe four or six other states are currently moving in that direction, but they all have the July 1, 2010, deadline. There's a complete exemption for commercial and institutional facilities, or a maximum limit of 8.7%. That's for hospitals, schools, or any sorts of facilities that have commercial or institutional dishwashing machines.
On June 9th, 2008. See this statement in context.