What to major in in order to go into wastewater treatment?

So this seems like an interesting field to me. However, I have no idea what I’d major in in order to get into this field. Would biology or microbiology work? I definitely think I’d be more interested in the bacteria end of WW. I’m also interested in working at a fishery, but I know good jobs in fisheries are not as common as in wastewater (correct me if I’m wrong). So, if I were to pursue that and get a degree in fisheries biology (or something of that nature) do you think I’d still be able to find a job in wastewater? What about majoring in one and getting a masters in the other? Double majoring? Any opinions are welcome!

Look at civil and environmental engineering programs to learn about wastewater treatment for example https://www.ce.washington.edu/

If you want to be a fish biologist look at wildlife programs

Some schools offer specialized majors just for fisheries https://fish.uw.edu/students/about-undergraduate-program/degrees-offered/

The thing is is that I don’t want to go into the engineering side of it I want to go into the biological side of it. From what I’ve heard from people online who claim to be on the industry, they hire bio majors and many other majors very often

Look into Environmental science degrees with a concentration in Hydrology. This might fit your goal the best.

Here are some I found:

http://es.ucsb.edu/academics/hydro-sci-major
https://catalog.csuchico.edu/viewer/14/GEOS/ENSCNONEUN.html
http://degreesearch.arizona.edu/major/environmental-hydrology-water-resources
https://www.evsc.virginia.edu/research/hydrology/
http://www.caes.ucdavis.edu/students/academics/majors/hydrology

Environmental science, environmental engineering, chemical engineering would all be applicable.