In the Northeastern United States, the passage of heavy things - streams of automobiles - necessitates a constant stream of road salt to accompany them, in order to free them up from the heavy snowfall, itself augmented and set free by circulating moisture and changing climate patterns. And all of the salt
washes out into the freshwater lakes and rivers, increasing their salinity and making them more basic, which as it happens, eats at the aging plumbing infrastructure that grows older the more east you go.