Listly by Carol Soriano
Algae typically sounds harmless. In some cases though, algae can spread wide enough and in incredible density that they pollute a lake, making its water unfit for consumption. The exact thing happened in Lake Erie last summer, when the nearby city of Toledo in Ohio had to ban consuming water from the lake.
Toxic algal blooms are an environmental issue that affects millions globally. More than just an eyesore-blooms can have adverse effects such as the "do not drink" advisory that affected over half a million people in Toledo when Lake Erie was struck.
Your pond might be man-made, but the elements that support it are very well part of nature herself. So it goes without saying that from the fish to the vegetation, your pond's health relies on no small part to seasonal changes.