This post from @InevitableSwing@hexbear.net led to me poking around /r/H5N1_AvianFlu, and I found this other post discussing a way to view H5N1 wastewater data:
I seem to have found a secret link to the H5N1 data in wastewater on the Verily website.
https://deploy-preview-14--wastewater-scan-tracker.netlify.app
To access the H5N1 data
- Click on the chart icon in the upper left, underneath the pin icon
- Ignore the text box, click anywhere else.
- Select respiratory, influenza, and subtype "H5"
- Select all locations, I used the heatmap and found Michigan and Texas to have positives.
(These instructions are for the desktop browser - someone in the comments mentioned how to do it from the phone.)
Here's the long, ugly link to the chart I generated following those instructions.
It lets you generate an image, but it also kept crashing my phone as it was loading, so ~~idk if~~ I'm pretty sure not every available site is included. (The site does that thing of gradually adding more fields to the chart as it loads, instead of taking forever to load a complete chart.)

Obviously it's not just human waste in the sewage system, but it does seem worrying, especially in light of a couple of megathread comments from @BigBoyKarlLiebknecht@hexbear.net I found while trying to figure out which community was best for posting this.
(edited content into post)
Edit v2:
the edit history of this post would suggest I should be confined to /badposting or /postingkindergarten until I learn how to use the site
Edit v3: Also, where should I have posted this?
Here is fine, cth is our general-purpose comm and it's not like we have a /c/h5n1 lol
Not yet anyway
I sure do wish we could trust the government for accurate and timely information. Instead we are reduced to reading doo doo tea leaves. Like are people dying from this thing?