This week COVID activity levels in wastewater fell in most States but remained relatively high in the South and West.

Wastewater Viral Activity Levels for Covid by State for week ending Sep 19, 2026. Hover the cursor over a State to find more details.

The Wastewater Viral Activity Level is a calculated measure that aggregates wastewater sample data to get state, regional, and national levels and see trends over time. The value associated with the Wastewater Viral Activity Level is the number of standard deviations above the baseline from the past 24 months, transformed to the linear scale.
Chart: Bob HawkinsSource: CDC National Wastewater Surveillance SystemGet the data