Basic Course: Key Concepts

Forms of Expression: The Basis for Each Form

There are specific expectations when developing narrative or numeric critera.

Numeric Criteria

Should be adopted based on:

EPA recommendations provided under Section 304(a) of the Clean Water Act, or
The Section 304(a) recommendations, but modified to reflect site-specific conditions, or
Other scientifically defensible methods.

Narrative Criteria

Should be adopted based on: Biological monitoring and assessment methods to supplement numerical criteria.

Disclaimer:
For informational purposes only–Not official statements of EPA policy.

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