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Frequently Asked Questions on Lake Erie Severity Index Time Series

Frequently Asked Questions on the updated Lake Erie Severity Index time series (pdf) (771 K).

This resource was developed by members of the Annex 4 Subcommittee and reviewed by Dr. Richard Stumpf (NOAA). The FAQ is intended to assist in communicating key messages to stakeholders. It does not reflect official agency responses, decisions or policy.

Frequently Asked Questions

  • Why did NOAA recalculate the historic time series record of Lake Erie harmful algal bloom severity in 2025?

  • What changed when NOAA updated their time series record in 2025?

  • Has the goal for what we are trying to achieve in Lake Erie changed?

  • Does the change provide any new insight on progress being made in Lake Erie?

  • What happens next?

Great Lakes Water Quality Agreement (GLWQA)

  • GLWQA Home
  • What is GLWQA?
  • GLWQA Annexes
  • Annex 4: Lake Erie Nutrients
    • About Annex 4
    • Status and Progress
    • Domestic Action Plans (DAPs)
    • U.S. Action Plan for Lake Erie
    • Lake Erie Water Quality Data
Contact Us About the GLWQA
Contact Us About the GLWQA to ask a question, provide feedback, or report a problem.
Last updated on August 18, 2025
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