Explore SARS-CoV-2, Influenza A, and RSV wastewater activity, emergency visits, CDC Long COVID prevalence estimates, and local air quality. Free, no signup.
Across 836 reporting sites
15 up, 30 down
Of 48 reporting jurisdictions: 15 rising, 30 falling, 3 steady.
Week ending September 26, 2026
Data: CDC NWSS, updated weekly on Fridays. The newest week is preliminary.
Real-time EPA AirNow conditions and AQI health guidance by ZIP or device location.
Enter a ZIP code or tap the GPS icon to inspect live AQI and particulate data.
Wastewater tells you what is circulating. These numbers tell you what it leaves behind.
Latest national estimate
3.6% of US adults currently experiencing Long COVID
National Health Interview Survey, 2024
The most recent national estimate: 3.6% of US adults were currently experiencing Long COVID, 8.4% had ever had it, and 2.3% had activity-limiting symptoms. The state map uses the final Household Pulse Survey (Sept 2024), still the most recent state-level data available; CDC's next state update, from the 2024 BRFSS, is anticipated December 31, 2026. [R]
CDC Tracking Long COVID1 in 6
infections lead to long COVID
Researchers reviewed records from 457,950 patients across 58 US hospitals and found 16.3% went on to develop long COVID. That makes it one of the most common outcomes of infection rather than a rare complication. [R]
Transient Systemic Capillary Leak Syndrome89.3%
also carry a chronic condition
Long COVID rarely arrives alone. Nearly nine in ten patients are managing at least one other chronic condition at the same time, which is what turns a single infection into a long-term care problem. [R]
Micro Sepsis and Sickness BehaviorUnder half
of cases ever get a diagnostic code
Diagnostic codes capture fewer than half the people who meet the criteria. That leaves more than 10 million Americans effectively invisible to national surveillance, which is exactly why a signal measured in wastewater is worth watching. [R]
Junction Dysfunction: IntroductionStill climbing
new cases rose through mid 2024
New long COVID cases kept accumulating well into 2024. The assumption that this is a fading legacy of 2020 does not match what the hospital record actually shows. [R]
How Does Covid Cause Aging?Not one illness
organ involvement varies by patient
Which organ systems get hit differs enough between patients that researchers are moving toward distinct mechanism-based subtypes rather than a single diagnosis. That is the same conclusion the Junction Dysfunction framework reaches from the vascular side. [R]
Microcapillaries and Vascular POTSPeople shed SARS-CoV-2, influenza, and RSV in stool whether or not they test, whether or not they have symptoms, and whether or not they ever see a doctor. A treatment plant samples everyone in its service area at once, so the signal does not depend on who decides to get tested. When home testing replaced lab testing, case counts stopped tracking reality. Wastewater kept working.
CDC publishes a Wastewater Viral Activity Level for each individual treatment site, but its state and national figures are not available as a downloadable dataset, so this page recomputes them from the site data using CDC's own published method. A state is the median of its sites, each region is the median of its states, and the national number is the median of the four regions. That same method runs for all three tracked pathogens. The category cut points are CDC's own, and each pathogen has its own set: CDC says plainly that each virus behaves differently, so SARS-CoV-2, influenza A, and RSV are each scored against their own published thresholds rather than sharing one scale, applied as written and not rescored here. [R]
Because both the method and the category cut points are CDC's, this page reproduces CDC's published figures rather than approximating them. For SARS-CoV-2, checked against the feed behind CDC's own state dashboard for the week ending August 1, 2026: all 52 reporting jurisdictions matched exactly, on both the number and the category, as did the national figure. One presentational difference: CDC lists North Dakota as Limited/No Data, while this page leaves it unshaded, because no North Dakota site reported. Influenza A and RSV run through the identical code path and CDC's own published thresholds for each, but have not been separately spot-checked against CDC's dashboard the same way. CDC's dashboard remains the authority.
A state is marked rising or falling only when it moves more than 5% against the prior week. Anything smaller shows as steady. Wastewater is noisy week to week, and without that deadband nearly every state would show an arrow every week.
The Long COVID view has two sources. The latest national estimate comes from the National Health Interview Survey (3.6% of US adults currently experiencing Long COVID in 2024). The state map uses the final Household Pulse Survey (Sept 2024), still the most recent state-level data available; CDC's next state update, from the 2024 BRFSS, is anticipated December 31, 2026. Both are population surveys, not live case counters. Every reading keeps its collection period and 95% confidence interval attached, and states that CDC suppresses for statistical reliability remain visibly unscored rather than being filled from an older period. The map shading is relative to the highest published state estimate in that same survey period; it is not a clinical severity threshold. [R]
The most recent week is preliminary and shifts as more sites report, so treat the newest point as a draft. Coverage is uneven: some states have dozens of reporting sites and others have a handful, and North Dakota currently reports none. Wastewater shows how much virus is circulating in an area. It cannot tell you your personal risk, and it is not a diagnosis.
Several states run their own wastewater dashboards with more detail than the national feed carries, including site level and county level views.