The Northern Waterthrush is a common warbler of Canada's northern forest bogs, swamps, and riparian habitats, with a breeding range reaching from the west to the east coast and into the subarctic. It winters from southern Mexico to northern South America, including the Caribbean. There are approximately 13 million individuals in Canada, which represents 76% of the global population and a very high degree of responsibility for Canada; another 4 million individuals breed in Alaska and migrate through Canada, boosting the total proportion of the global population using Canada to 98%. The Canadian breeding population has shown a moderate increase relative to 1970. Confidence in this assessment is medium because the Breeding Bird Survey has high precision but only offers moderate geographic coverage. The national population of Northern Waterthrush is within its goal range.