Award-winning reporter Hedrick Smith on water pollution
Alex Levchuk and Dale Thompson, with the Minnesota Pollution Control Agency, took sediment samples from a Woodbury pond. They're looking for runoff from asphalt sealer that's thought to be an emerging pollution problem.
MPR Photo/Tim Nelson
Gallery
Grow the Future of Public Media
MPR News is supported by Members. Gifts from individuals power everything you find here. Make a gift of any amount today to become a Member!