"Salty water is a growing problem in Minnesota that affects aquatic life and our drinking water," reports Clean Water MN. The organization has resources to help spread the word about using salt wisely on sidewalks, parking lots, and driveways.
The best thing to do is to stay on top of shoveling as it snows so you can limit or avoid salt use. And don't use salt when it's colder than 15 degrees Fahrenheit - most sidewalk salts don't work at colder temperatures.
Some helpful resources:
Using salt wisely tip card: four simple steps for salt use - shovel, select, scatter, sweep
GreenCorps members fight to keep salt out of Minnesota lakes: article on the role that water softeners play in the health of our lakes and rivers plus winter maintenance tips