People have described the odour over recent days in the Netherthorpe and Lowfields areas of Staveley and close to the banks of the nearby River Doe Lea.
However, there are several different theories about what might be causing it.
In a post on the ‘Staveley and surrounding areas community resource’ Facebook page, one resident said the odour was ‘very strong’ and she had called an emergency number.
"Hope they manage to find the source, it is quite unnerving especially as it seems to be covering a large area,” she added.
Another posted: “I have smelt it for a day or two round Netherthorpe and also near the Doe Lea at the bottom of lane going past entrance to school.”
Residents commenting on the page are undecided about what could be causing the smell – with some blaming the river or the tip.
We have contacted British Gas and Cadent for comment.