A question about arsenic in groundwater came up at the ideation event. Heat maps of groundwater analytes could be made using the MPCA's Groundwater API.
Here's a sample URI requesting groundwater data from monitoring wells in Ramsey County: http://services.pca.state.mn.us/api/v1/groundwater/monitoring-stations/results?stationPurpose=Monitoring&specificGeoAreaCode=county__123&format=text
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