Outbreak Radar maps real-time disease activity across the United States using CDC wastewater surveillance data. Our interactive map displays current COVID-19, Influenza A, RSV, and Measles levels at 1,238 monitoring sites covering all 50 states and Washington D.C. — updated every week as the CDC publishes new data.
Unlike reported case counts, wastewater surveillance captures every infected person in a community — including those who never get tested. Viral RNA shed in sewage is detected at treatment plants days before hospitals see a surge, giving you an early warning signal for what's spreading near you. Each dot on the map is sized by the current week's concentration as a percentile of that site's own history, so you always see how today's levels compare to the past.
Monitoring sites span every region of the country. States with the most sites include New York (61), Ohio (52), Illinois (46), California (41), Louisiana (37), Wisconsin (34), Indiana (32), South Carolina (31), Kentucky (30), and Minnesota (29). Rural and suburban communities are included alongside major metros.
Search your ZIP code to find the nearest monitoring sites and see current disease levels in your area. Use the time slider to replay past seasons and watch illness waves move across the country week by week.
Outbreak Radar is for informational purposes only and does not constitute medical advice. Data reflects wastewater viral activity, not confirmed case counts. Source: CDC National Wastewater Surveillance System.