Which state has the toughest plumbing code?

Building codes are usually established by the municipality where the building is located. State laws concerning this issue generally pertain to public structures such as, hospitals, government buildings, and so forth, but can supersede municipal codes in some circumstances. It would be unusual for any town, city, etc. not to require some type of Plumbing codes, with the exception perhaps being private rural property. In Minnesota we have a state code. There is a Uniform plumbing code that is national but many states supercede it with their own code. At least for now.