The West Point (WSPT) sewage treatment plant Sars-CoV-2 7-day rolling average continues to bounce around the levels its been at for weeks, with maybe a very slight uptick that’s hard to see on this graph. The last 7DRA number was calculated on 5/14.
WSPT is one of three King County(-ish) sewersheds in this dataset. You can find overviews, individual sewershed results, and a breakdown of variants for the state wastewater surveillance program, along with other metrics like case counts and hospitalizations for Covid-19 and other respiratory illnesses, at https://doh.wa.gov/data-and-statistical-reports/diseases-and-chronic-conditions/communicable-disease-surveillance-data/respiratory-illness-data-dashboard#WasteWater. If you go to the page and click "learn more" in the statewide view tab, you can find out lots of details about how these data are calculated and how to interpret them. The dashboard gets updated every Wednesday (generally).
Note: when the state switched over to new data providers in September, they also removed the previous historical data from the graphical interface. That's because the two providers used different methodologies that made direct comparisons difficult. Unfortunately, it also removed valuable context for interpreting the results. So, keep in mind we're just seeing what happened in September 2023 until now.