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Yes, they can be. Humans and pets should avoid contact with any water that appears slimy, scummy or smells foul.
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It's an overgrowth of microscopic algae that derives energy from the sun. This can occur in both fresh and salt bodies of water.
There can be severals causes: stagnant water, pollution, warm water or climate change.
On the water surface, it can look like froth, foam, paint or scum. It can be several different colors to include: bluish-green, red, brown, yellow or even pink.