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This layer was developed to show areas of Nova Scotia where there is a relative high-, medium- or low-risk of manganese in water wells. The high-risk zone is defined as bedrock units where more than 15% of well water samples exceed the manganese in drinking water guideline of 120 µg/L. In the medium-risk zone, between 5% and 15% of well water samples exceed the guideline and in the low-risk areas less than 5% of well water samples exceed the guideline. 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