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I'm in need of finding a data source that I can use to create a heat map showing varying water hardness in the U.S.

I've tried the usual, i.e. usgs, epa, and I'm not able to find what I need.

I'd like to make something similar to this (I can't find the original creator so I have to make my own

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3 Answers 3

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Water hardness is not measured by the EPA or similar sites, like MyTapWater.org, EWG etc. I'd look into private datasets from MyTapScore, who has released similar data sets.

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  • Thanks. Checked into it. MyTapScore gave me access to their db, but it's a web based street by street inquiry, so that's not going to work. They also source some their data from government sources such as: SDWIS, ECHO, UCMR 4, US Geological Survey’s National Water Information System (NWIS), Environmental Protection Agency’s Storage and Retrieval data warehouse (STORET), US Department of Agriculture’s Sustaining Earth’s Watersheds - Agricultural Research Database System (STEWARDS), National Water Quality Monitoring Portal (WQP).
    – gwfami
    Feb 2 at 21:56
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I stumbled upon this open dataset about water quality. It shows much more than just hardness but I'm not sure if it can help you: https://www.kaggle.com/datasets/adityakadiwal/water-potability

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  • Thanks. It seems that this dataset is fake. The numbers and discussion verify that it isn't real world data.
    – gwfami
    Jul 2 at 22:44
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Honestly I've been looking for a similar dataset. So far I found this but have no way of actually downloading it since it's too big (I think).

This is real data and pre-collated to include several definitions of hardness. I'm still exploring the page but I think it could be possible to get the geographical data too: https://www.waterqualitydata.us/#countrycode=US&sampleMedia=Water&characteristicName=Hardness&characteristicName=Hardness%2C%20Ca%2C%20Mg&characteristicName=Hardness%2C%20carbonate&characteristicName=Total%20hardness&characteristicName=Hardness%2C%20non-carbonate&mimeType=csv&dataProfile=narrowResult&providers=NWIS&providers=STEWARDS&providers=STORET

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  • I've used that source before, but now I am having issues getting it to return any data to me, either by browser or curl.
    – gwfami
    Jul 5 at 15:54

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