Credit: MNStudio, Shutterstock This weekend Americans will head to our local river for a float trip or fishing excursion, to our favorite lake for a refreshing swim, or to the beach to ride the waves and soak up the last of the summer sun. Our enjoyment of these waterways will be particularly sweet over the next few days, not just because we'll mark one of the last hurrahs of the summer season, but also because our favorite rivers and lakes are now better protected from pollution than ever before.