@ikuo1000 @chargrille
My reply was not so much about MSP as it was speculation that maybe people hearing about improvements in a distant region change their behavior in their own region. But if we’re talking MSP…
I’m sure seasonality is part of it. It’s not the whole story. We maybe saw seasonality as you describe in 2021, but not at all in 2022. See images below (second scaled so Omicron wave doesn’t dominate): low areas were Feb 2021, Jun/Jul 2021, Mar 2022, now.
https://metrocouncil.org/Wastewater-Water/Services/Wastewater-Treatment/COVID19-Research.aspx