Carter and former first lady Rosalynn Carter are the organization's most prominent supporters, and since 1984 have built, renovated or repaired almost 4,000 homes globally, according to the nonprofit's website.
The 92-year-old was discharged on Friday morning from St Boniface General Hospital where he was treated "as a precaution" for dehydration, his spokeswoman Deanna Congileo said.
"President Carter told us he is OK and is being taken offsite for observation", Reckford said.
"Former U.S. President Jimmy Carter became dehydrated this morning while working at a Habitat for Humanity build site in Winnipeg, Manitoba, Canada".
Carter had joined Habitat as the organization builds 150 homes for people in need in Canada to celebrate the country's 150th anniversary.
"He and Mrs. Carter extend their appreciation for the many well-wishes he received worldwide", Congileo said in a statement. The couple, married more than seventy years, was planning to help with the Winnipeg build on Thursday and Friday.
He then attended a prayer service at the work site.
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"President Carter has been working hard all week". He was treated by paramedics who took him away in an ambulance, without using lights or siren, the newspaper said. But less than a year later, a smiling former president was even more upbeat and excited as he announced that after a full round of treatment that the cancer had been beaten back. Carter continued to volunteer for Habitat while being treated for cancer, working alongside volunteers at a home in Memphis in November 2015.