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Water: Mixing Zones

Compilation of EPA Mixing Zone Documents

Mixing Zone Navigation Links

We have made available a compilation of EPA regulatory and guidance documents published to date on mixing zones. Until now, EPA statements on mixing zones could only be found throughout various handbooks, memos, and other documents that EPA developed over the years. EPA created this Compilation to provide states, territories, tribes, and other interested parties with easy access to mixing zone information.

We expect that this Compilation will be especially helpful to states that are revising mixing zone provisions in their water quality standards or implementing those provisions in NPDES permits. It may also help stakeholders consider mixing zone policies and implementation procedures in their jurisdictions.

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.

The full compilation is available in hard copy. You can order the document EPA-823-R-06-003 from the National Service Center for Environmental Publications (1-800-490-9198).

Office of Water Assistant Administrator Cover Memo (PDF) (93 K, 2 pp)

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Table of Contents


The discussions in the documents collected in this Compilation are intended solely as guidance. The statutory provisions and EPA regulations described in this compilation contain legally binding requirements. This document (or the documents referenced herein) are not a regulations, nor do they change or substitute for those statutory provisions and regulations. Thus, this document or the documents collected here do not impose legally binding requirements on EPA, states, authorized tribes, territories, or the regulated community. This Compilation does not confer legal rights or impose legal obligations upon any member of the public.

While EPA has made every effort to ensure the accuracy of the discussion in this Compilation, the obligations of the regulated community are determined by statutes, regulations, or other legally binding requirements. In the event of a conflict between the discussion in this Compilation and any statute or regulation, this Compilation would not be controlling.

The general description provided here may not apply to every circumstance. Interested parties are free to raise questions and objections about the substance of this guidance and the appropriateness of its application to a particular situation. EPA and other decision-makers retain the discretion to adopt approaches on a case-by-case basis that differ from those described in this guidance where appropriate.

Mention of trade names or commercial products does not constitute endorsement or recommendation for their use.

This is a living document and may be revised periodically without public notice. EPA welcomes public input on this document at any time.

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