An Ecological Integrity is the condition of an unimpaired ecosystem as measured by combined chemical, physical (including physical habitat), and biological attributes.

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Other /More definition:
An ecological integrity is the condition of the biotic (aquatic community) and abiotic components (water chemistry and habitat) of unimpaired waterbodies as measured by assemblage structure and function, water chemistry, and habitat measures.

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Other /More definition:
An Ecological Integrity is the condition of an unimpaired ecosystem as measured by combined chemical, physical (including physical habitat), and biological attributes.