When Gretchen, Jason, Mark, and Daphne find their favorite swimming hole filled with green slime, they are horrified. A mysterious, almost magical naturalist named Riparia helps the children understand why the water became polluted-and together they figure out what they can do to bring clean water back to the river they all love. This lively story about non-point source pollution is filled with both information and action. Realistic, lush illustrations by Olga Pastuchiv illuminate the children's passion for their river and the ecosystem it supports.
