Health warning signs have been placed at St Leonards and Corra Lynn by the Launceston City Council saying that people should not swim or drink the water.

The First Basin remains closed after an outbreak of enterococcus bacteria was detected last Friday.

Signs at the Basin state that people should avoid contact with the water.

``We are conducting further water tests and expect to have the results later this week,'' council general manager Robert Dobrzynski said.

The bacteria can cause a range of ailments including localised redness, sinus infections, nausea, indigestion, fatigue, stomach pain and stomach inflammation.

The pool at the Basin is open and safe for swimming.