Add datasets for local water quality

[graybeal]

What type of need does this dataset address?
_Information about possible contaminants, localized to specific areas

If there is a specific dataset that meets this need, please specify it.
Describe the following dataset details as best you can.
Name: tbd
IRI: tbd
Distribution provider: USGS?
Publishing authority (if different than provider): USGS?
License (URL where declared, or explanation of why you think it is publicly available): public US gov. data

The ideal dataset would be localized to census tract or better. Andrew Lawson writes:

I haven’t looked into water based pollutants yet but we may be able to get radiation in well water (USGS). I'll check

Describe other options for this kind of data
If you don't have a specific data set in mind, provide a clear and concise description of any alternative datasets or sources you've considered.

Additional context
Add any other context about the dataset request here. In particular, if you are an expert on this dataset, or can recommend someone who is, please make that clear.