Winnipeg Regional Health Authority spokesperson Anne Bennett told CNN Carter was admitted to St. Boniface Hospital.
A spokesperson for Habitat for Humanity told media that Carter was taken to hospital as a precaution but has since told the organizers he is feeling fine.
A Habitat volunteer told CBC News that saw Carter, 92, collapse.
President Jimmy Carter was taken off site for observation after experiencing dehydration.
He added, "He has asked us to continue with our day".
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In Canada, Carter had been volunteering with a project to build 150 homes with Habitat for Humanity in honor of the country's 150th birthday.
Carter and his wife, Rosalynn Carter, have traveled around the world working with Habitat since 1984, according to the organization.
Former United States President Jimmy Carter speaks at "The Board of Directors of the Canadian American Business Council Presents A Converation With Jimmy Carter and Joe Clark" at The Carter Center on June 15, 2017 in Atlanta, Georgia.
The former president is in Canada as part of Habitat for Humanity's plan to build 150 houses in Canada, including 25 in Winnipeg, as part of the nation's 150th anniversary celebration.
Carter was in the sun helping build some stairs when he became pale and said he needed a break.
Jim McGrath, a spokesman for former President George H.W. Bush, tweeted the 41st president's well wishes Thursday afternoon.