While water salinity isn't a major issue in most regulated urban water systems, Gupta said the concern mainly applies in coastal and low-lying regions where saltwater intrusion contaminates groundwater, increasing sodium concentrations in drinking water.
—
Mira Miller,
Verywell Health,
11 May 2026
Humpbacks thrive in the North Atlantic; the Baltic is comparatively shallow, low in salinity, and heavily trafficked.
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