Across the state of Massachusetts, school districts are grappling with a new insistence that high school stadiums--often nothing more than a field, a track, and a few dozen rows of aluminum bleachers--adhere to the same code dictating the number of toilets-per-capacity as professional facilities like Gillette Stadium in Foxborough. Rulings by the state plumbing board have rankled local officials who previously thought portable toilets and an unlocked school building nearby were enough to serve bleachers that fill only for special events, such as graduation and Thanksgiving football games.