A pond in Horsell Common has been given the all clear, after it was previously thought to be affected with poisonous blue-green algae.
Last week members of the Horsell Common Preservation Society were advised to fence off the area and warn people not to go into the water, after samples were previously taken by officers from the Environment Agency on Friday (July 10).
Results from the investigation show that the pond in question is free from the poisonous toxin.
The news come after a dog owner said he had to take his pet to the vets, after the water made his canine "really ill."
Andrew Halstead, chairman of Horsell Common Preservation Society’s estates management committee, said: “The dog’s illness may have been caused by toxins produced by blue green algae but there are, of course, other possible causes of dogs being ill.”
Mr Halstead added: “I hope the dog has made a good recovery, whatever the cause.”
Blue-green algae occurs naturally in inland waters, estuaries and the sea and you can only see this when they are concentrated into clumps.
This type of algae needs nutrients to grow which exists in various forms of freshwater.
Increased period of growth are called blooms and this can have a negative effect on the appearance, quality and use of water.
It can also cause scum to form normally during calm weather when several bloom-forming species rise to the water surface.
Bloom and scum forming blue-green algae can produce toxin and in some cases these can kill wild animals, farm livestock and domestic pets.
In humans, they can cause rashes after skin contact and illnesses if swallowed, but not all blue-green algae blooms and scum are toxic.