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Water mains take incoming water, not drainage water. How does salting roads harm water mains?
Like, you mean that the water drains off and comes in contact with the pipe and damages it from the exterior?
searches
Ah. Yes. Apparently this was a thing in Calgary recently.
https://www.cbc.ca/news/canada/calgary/road-salt-calgary-bearspaw-south-feeder-main-9.6993387
Yep. They had two catastrophic failures within months of each other, with the second one flooding out a bunch of people in their cars, and everybody's just kind of praying there's not another before they can be fixed. They're steel wire reinforced concrete pipes, which don't love salty ground water, and Calgary is more often than not experiencing winter and frequently icy.