Why not remove snow in NYC and NJ using sea water?

I am surprised that communities such as NYC and Summit and Millburn of NJ would consider using "brine machines" for snow removal. Whether the machines use salt from the salt mines or made from the sea, there is an environmental cost in transportation and manufacturing. They also use fresh water from the water supply or from wasting energy in melting the snow. Either way, it would be a waste. These communities are close enough to the Atlantic and its ample saline sea water. Why not simply transport sea water a short distance to use for melting snow on the roads? Sea water would flow back into the ocean via the sewers and would result in no additional environmental impact.

In the longer term, why not create a sea water piping systems to distribute sea water for snow removal purposes? It would save petroleum wasted on the snow removal machines and reduce the pollution they create.