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Key Indicators for Understanding Our Region

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Environment / Water Quality Maps

This map shows the relative proportion of non-attaining vs. attaining waterways. Under the Clean Water Act, the PA DEP protects four stream water uses: aquatic life, fish consumption, potable water supply and recreation. If a stream segment is non-attaining for any of the four causes, it is deemed impaired and is displayed in yellow. See "non-attaining use" for cause of designation.

A map of watersheds in Allegheny County is available by clicking here, courtesy of our partners at 3 Rivers Wet Weather.

Data source: PA DEP via