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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.

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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.
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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.

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

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