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Water: Module 2

Basic Course: Key Concepts (Module 2.f)

Designated Uses: Subcategories

Module 2. Designated Uses

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A State/Tribe can adopt subcategories (and/or seasonal classifications) in its use classification system to further refine designated uses. For example, a State may choose to adopt subcategories to differentiate between coldwater and warmwater fisheries.

Key Point. Subcategories and seasonal uses are often used because determining water quality criteria to appropriately protect waters with broad use categories might be difficult or open to various interpretations.
Key Point. Economics may be factored into water quality standards when establishing designated uses and determining the "attainability" of those uses, not when developing water quality criteria.

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

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