What Are Harmful Algal Blooms?

Harmful algal blooms were all over the news after the Toledo drinking water crises of 2011 and 2014, but what actually causes these algal blooms and why are they problematic?

This online fact sheet will provide you with answers about what makes up a harmful algal bloom, why they form, why they're an issue, and what you can do to help prevent them and keep yourself safe.