According to new signs on the University lake, the longstanding issues with algae has become increasingly more dangerous to students.
There is a significant presence of toxic blue-green algae on the lake surface, which is potentially harmful to anyone coming into contact with it.
Further, the Environmental Agency has confirmed that several litres of oil were spilt into the lake in August 2008. The contractors responsible, Northfield Construction, were warned at the time for the mistake.
The lake, which is the largest artificial example in England, has long posed significant health risks. Last May two students were hospitalised after swimming in the lake for an extended period of time. The University currently has no plans to undertake any cleaning procedures.