Minnesota Water Steward Joe Knaeble is concerned with a problem that is mostly invisible: increasing levels of salt in groundwater due to the overuse of deicing salt. Perhaps less invisible is the sidewalk salt that remains after an over-zealous application of the product to urban sidewalks and roadways. Knaeble’s concern with the overuse of salt has led him to sweep more than 270 pounds of excess deicing chemicals from his neighborhood over the past two winters.

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The Iceman Cometh—Sidewalk Salt Pollutes Our Lakes and Streams