That's according to officials on Monday (August 7).
The event's organizers plan to evacuate tens of thousands of teenage scouts out of the path of the typhoon that is set to drench their campsite.
The storm is the latest headache for the jamboree's planners, which began last Tuesday amid one of the worst heatwaves to hit South Korea in years.
The heat caused hundreds of scouts to fall ill, triggering complaints from parents.
The British and U.S. contingents have already left the campsite.
The Americans are due to stay at a U.S. army base and the British at hotels in the capital, Seoul.
UK Scout chief Matt Hyde acted on his concerns.
"We were concerned that the toilets weren't being cleaned frequently enough. It wasn't safe in there. And there was rubbish building up as well.// There were concerns around food and particularly those with dietary requirements that weren't getting the food that they needed so they were eating less.//
We didn't think it was safe for the young people and the adult volunteers."
The governor of North Jeolla province, which is hosting the event, has apologized.
And officials have sent in scores of water trucks and air conditioners to keep participants cool.
Typhoon Khanun, which has wreaked havoc in southern Japan, is forecast to reach southern South Korea on Thursday, near the jamboree's campsite.
A ministry official told reporters that about 36,000 participants would be taken by bus on Tuesday to areas that are away from the path of the typhoon.
Officials are seeking alternate venues and accommodation in and around Seoul, as well as in university dorms.
More than 40,000 people were at the jamboree, the first global scout gathering since the health crisis.
