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Water: Module 2

Basic Course: Key Concepts (Module 2.e)

Existing Uses: The Uses Already Attained by a Water Body

Module 2. Designated Uses

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Existing uses (defined in 40 CFR 131.3(e)) are uses that were "actually attained" in a water body on or after November 28, 1975—the day EPA promulgated the original water quality standards regulation.

Determining existing uses that have been actually attained in a water body may involve evaluating data on the following:

  • Historical/current water quality.
  • Historical/current biological condition.
  • Pattern, frequency, and type of use.
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Video Clip View a 2-minute video clip from the classroom session about EPA and States/Tribes working together on water quality.

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

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