PEOPLE are being advised not to swim in the First Basin at Launceston's Cataract Gorge after a routine water test returned high levels of bacteria.
The test was conducted by the Launceston City Council, with the result being released yesterday.
The council has advised that people should not touch the water until further notice.
This included swimming, boating and fishing.
Signs have been placed around the area to warn people of the poor water quality.
The pool is still open.
The council said tests had returned high levels of enterococcus bacteria.
The bacteria can cause a range of infections and symptoms can include localised redness, sinus infections, nausea, indigestion, fatigue, stomach pain and stomach inflammation, swelling and pain.
The council said it would advise the community when bacteria levels dropped to safe levels.