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Great question! For the US, you will need a degree in Molecular Biology/Microbiology or a Medical (Laboratory) Technologist. You’ll then either need to live near the city where one of the few private companies that do wastewater testing ar e(my case), or live near a public health lab that does ww. Pretty much all state public health labs do it, but city/county level varies immensely. For the government route, look at APHL or NACCHO to find information on your local public health labs. There are a few universities that also do ww testing, for example I know University of Illinois, University of Missouri and Michigan State are all doing a bunch of wastewater work.
Feel free to DM me if you want more information.
A lot of 3D printing patents from the 80s and 90s expired between 2010-2020, clearing the way for commercial 3d printers and a million innovations. I’d call them honorary 21st century inventions, since the patent holders squandered the technology in the 90s.
https://www.finnegan.com/en/insights/articles/how-patents-die-expiring-3d-printing-patents.html