I wrote a few weeks ago about how the increase in covid in Boston's sewage was seasonal, and didn't yet reflect Omicron. Now this, though, this is Omicron:

We're at about 8x the previous peak and still climbing:

It also looks to be moving a bit quicker in the Southern half of the system, possibly even peaking but that might be optimism:

Test positivity is very high: 22% over the last seven days per the state dashboard, but 29% if you take the most recent daily number and adjust for effect of the day of the week. This, plus rapid testing now being much more common, means that official case numbers are pretty hard to interpret, so it's really nice to have the wastewater data as something consistent. That is, unless Omicron makes people excrete more virus at a given level of infectivity...