I have always thought these people were a little off. Well this morning my sister calls me and says do not drink the water . We have a problem with our local water supply. This is around a half a million people in the Toledo Ohio area that cannot use our water to cook with or drink. So far they are saying that a filter will not work and boiling it will only make it worse. This from the news web site.
Lake Erie, which is a source of drinking water for the Toledo water system may have been impacted by a harmful algal bloom (HAB). These organisms are capable of producing a number of toxins that may pose a risk to human and animal health.
For the whole story.
http://www.13abc.com/story/26178497/urgent-message-from-city-toledoans-asked-not-to-drink-or-boil-water
Now I have a small supply of water and I also have a well that an outside hose is hooked to but I live by myself so I am not worried. But this makes me wonder what would happen on a larger scale as in a much bigger city.