tapwaterdata/us-water-hardness
US Water Hardness Dataset Measured drinking-water hardness for 16,561 US cities — mg/L as calcium carbonate and grains per gallon (gpg), each value carrying its source, tier, and sample date. Canonical, continuously-updated source: https://www.tapwaterdata.com/water-hardness GitHub mirror: https://github.com/Tapwaterdata/water-hardness-dataset DOI: 10.5281/zenodo.21315903 Files water-hardness.csv — 16,561 rows, 17-column header. water-hardness.json — same 17… See the full description on the dataset page: https://huggingface.co/datasets/tapwaterdata/us-water-hardness.
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