It's my understanding that current wastewater testing for Influenza A would catch an H5N1 outbreak. While I can't find any research confirming that, it IS a subtype of "Influenza A" so it makes sense.
If so, the wastewater does not show any signs of a human outbreak of H5N1.
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If this paper is to be believed, and I have no reason not to, I was wrong to go along with what I read previously on this. Also, why there was no paper that I could find on testing for H5 in wastewater.
https://www.medrxiv.org/content/10.1101/2024.04.26.24306409v1.full.pdf+html
Wastewater plants appear to test for H1, H3, N1 and N2, but not H5.
