In water quality planning, what does use status indicate?

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Use status tells you whether the water body’s designated uses are currently being supported by its water quality. In practice, states designate intended uses for each water body (like drinking water supply, recreation, aquatic life support, and wildlife habitat) and set standards to protect those uses. The use status is a snapshot of whether current conditions meet those standards for the designated uses. If the water quality supports the uses, that part of the use status is shown as supported; if not, it’s marked as not supported, signaling impairment and often prompting planning actions or corrective measures (like a TMDL).

This concept isn’t about economic value, water temperature, or which fish species are present, though those factors can influence water quality decisions. The focus here is on whether the water meets the standards required to sustain the uses that have been designated for it.