To amend the Harmful Algal Bloom and Hypoxia Research and Control Act of 1998 to reauthorize the national harmful algal blooms and hypoxia program and require an assessment and action plan for reducing harmful algal blooms and hypoxia in the Greater Everglades region, and for other purposes.

Harmful Algal Bloom and Hypoxia Research and Control Act of 2018 This bill addresses harmful algal blooms and hypoxia, including to: (1) increase the authorization of appropriations for the national harmful algal bloom and hypoxia program and the action strategy of the Inter-Agency Task Force on Harmful Algal Blooms and Hypoxia through FY2023, and (2) address harmful algal blooms and hypoxia in the Greater Everglades region of Florida. An algal bloom is a rapid growth of algae that may create toxic or hypoxic (severely low-oxygen) conditions that are harmful to humans, animals, aquatic ecosystems, and the economy.