Revisor ID: R-04737

The MPCA plans to amend Minnesota Rules chapter 7050, which establishes beneficial uses and water quality standards (WQS) to protect those uses, and designates where the uses occur in waters of the state. The planned amendments affect the Class 2 beneficial use, which protects surface waters for aquatic life. This rulemaking proposes to revise an existing ammonia water quality standard to bring the protections of aquatic life up to date with current science.

Background

This rulemaking focuses on Class 2 (surface) waters protected for aquatic life, and one pollutant: ammonia. This rulemaking proposes to revise an existing ammonia water quality standard to bring the protections of aquatic life up to date with current science. The expected rule revisions include:

  • An updated standard for ammonia to include EPA criteria — a final acute value, maximum standard, and final chronic value in Minn. R. 7050.
  • Possible additions or revisions to Minn. R. 7053 necessary to support implementation.

Rulemaking documents

September 2022

July 2022

Schedule

This is a tentative schedule.

Date(s)

Details

Aug. 1, 2022 Publish notice of request for comments and comment period in State Register
Summer 2022 Informal public engagement
To be determined

Publish notice of hearing on proposed rule amendments in State Register
Public information meeting on proposed rule amendments
Public hearing on proposed rule amendments

To be determined Final adoption of rules


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