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1 teaspoon of salt ruins 5 gallons of water and the US used 3.7 million tons of softening salt in 2005 for water softening.

A teaspoon of salt weighs 5.7 g.
453.59 g in a pound

Approximately 80 tsp in a lb.

Sodium Chloride is water soluble and thus it does and will migrate.
The softening salt from 2005 theoretically  contaminated 3 trillion gallons of water.
3 trillion gallons is enough water for 33 million Americans for a year.

25% of US residences own water softeners. 75% don’t own water softeners.
Many regions need to reclaim their waste water for reuse in agriculture. You don’t have to be a botanist to know salt is bad for plants or a biologist for aquatic life. Waste water plants are budgeting for brackish water.
The 25% want the 75% to help pay for their part of the mess.
The water softening market continues to grow at a fairly steady rate. If we look at this in the long term, water softeners are an unsustainable technology in their current form. Each of them dumps 6 to 15 pounds of salt every time they clean themselves once or twice a week. Anything that has a large detrimental effect on the environment should be taken into serious consideration.
4 words for perspective and unsustainability “ Great  Pacific Garbage Patch”!