I want to find USA water hardness shapefiles. I have searched for it from here: https://www.epa.gov/waterdata/waters-geospatial-data-downloads but without success. Is there any good data source from where I can download these boundaries?

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    If you are seeking open data then you can always ask at the Open Data Stack Exchange. – PolyGeo Aug 23 '18 at 5:57

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