Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. Great Lakes Water Quality Agreement (GLWQA)

Lake Erie Bloom Severity, 2002-2022

Lake Erie Bloom Severity, 2002-2022

Year 

Bloom Severity 

Target 

2002 

0.3 

2.9 

2003 

4.1 

2.9 

2004 

2.7 

2.9 

2005 

0.3 

2.9 

2006 

1.3 

2.9 

2007 

0.9 

2.9 

2008 

6.2 

2.9 

2009 

5.1 

2.9 

2010 

5.8 

2.9 

2011 

10 

2.9 

2012 

2.9 

2.9 

2013 

8.5 

2.9 

2014 

6.6 

2.9 

2015 

10.5 

2.9 

2016 

3.2 

2.9 

2017 

8 

2.9 

2018 

3.6 

2.9 

2019 

7.3 

2.9 

2020 

3 

2.9 

2021 

6 

2.9 

2022 

6.8 

2.9 

Great Lakes Water Quality Agreement (GLWQA)

  • GLWQA Home
    • What is GLWQA?
    • GLWQA Annexes
      • Annex 4: Lake Erie Nutrients
      • About Annex 4
      • Domestic Action Plans (DAPs)
      • U.S. Action Plan for Lake Erie
      • Status and Progress
      • Lake Erie Water Quality Data
Contact Us About the GLWQA
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on October 23, 2024
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.