[mpnex]

This is actually pretty common. Two links offhand that have popped up on here recently:

Santa Clara County, CA: https://covid19.sccgov.org/dashboard-wastewater

Boston, MA: https://www.mwra.com/biobot/biobotdata.htm

HN thread for the Boston link: https://news.ycombinator.com/item?id=29466172 Thread has links to other areas as well, and some helpful discussion of how this data can be interpreted, as well as some potential problems with it.

It's my impression that most major metropolitan areas (and many smaller water systems) do this on a regular basis for multiple diseases; I guess it was never really common knowledge before it started popping up on web dashboards with this pandemic. Maybe they just weren't too keen on publishing it before now or something?