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United States Environmental Protection Agency
Water Quality Standards
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Water Quality Standards are the foundation of the water quality-based pollution control program mandated by the Clean Water Act. Water Quality Standards define the goals for a waterbody by designating its uses, setting criteria to protect those uses, and establishing provisions to protect waterbodies from pollutants.

Basic Information
The importance of Water Quality Standards and how they fit into overall water quality protection.

Where You Live
Regional and state specific information.

Recent Actions
Learn about current events, public meetings, documents, and actions.

Open for Comment
Listing of and links to draft guidance documents and proposed regulations to review and comment.

Laws & Regulations
Collection of legislative and federal requirements.

Policy & Guidance
Library of documents, notices, and memoranda designed to help states, tribes, & territories comply with federal regulations addressing water quality standards.

water quality standards logo

State, Tribal & Territorial Standards
Detailed information on the current standards for all waters of the U.S.

Provides access to several reports with information about designated uses, waterbody names, and numeric water quality criteria.

Training, Meetings, and Educational Materials
We offer courses, conduct public meetings, and provide resources to help you understand the basics and new developments.

Partnership with Tribes
See how to establish standards for federally recognized tribes.

Regional Coordinators
Points of contact for specific states and regions.



Water Quality Criteria


Models | TMDLs | Permits | Water Quality Criteria | Monitoring

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