Six Sigma at Governmental Water filtration Plants

I’m working as a consultant at several Governmental Water filtration Plants and I am also on a SS BB course. Six Sigma is not known at these institutes, but as I move on the SS BB course I’m seeing many opportunities to apply Six Sigma at these Governmental Water filtration Plants.Now I have to convince top-management to start some projects to let them see the benefits of Six Sigma. I think I can achieve this by showing them similar Six Sigma project cases already performed at other Governmental Water filtration Plants, or names/info of Governmental Water filtration Plants who are already applying Six Sigma.Can somebody please help me with this information?