Salt runoff does have a negative effect on river and pond ecosystems by increasing salinity and also increasing the chlorine levels. This may help some species and hurt others, but it is going to change the ecosystem in unpredictable ways, which is something we should be trying to avoid.
Unfortunately yes, salt used to combat icy roads does have some negative impacts. When the ice melts, it creates runoff water that can get into our drinking water (but drinking water is pretty thoroughly treated before it reaches your sink) and the soil. Salt in drinking water is not much to worry about, but the salt in soil can destroy shrubs, grass and other plants. It can also deplete the oxygen in water for aquatic animals and plants.
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