Based on public feedback, EPA has updated two chapters in its Water Quality Standards (WQS) Handbook and developed a third:
- Chapter 2: Designation of Uses. This revised chapter discusses ways to express designated uses; how to designate, revise, and remove uses; how to protect downstream uses; and when to reassess designated uses.
- Chapter 4: Antidegradation. This revised chapter discusses how to use the various tiers of antidegradation protection, how to develop an antidegradation policy, and recommendations and considerations when developing and implementing an antidegradation implementation method.
- New Chapter: WQS Variances. This chapter reflects EPA’s policy and guidance on the development and implementation of WQS variances consistent with the regulatory requirements in 40 CFR 131.14.
EPA seeks your comments on these revisions.
EPA will host informational webinars during the public comment period to provide an overview of the chapters and an opportunity for participants to ask clarifying questions:
- Webinar for the general public: Feb. 4
- Webinar for Tribes: Feb. 6
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