COVID Levels in Massachusetts
In the week ending 10 October 2026, wastewater virus levels in Massachusetts were High or Very High for COVID-19 at 1 of 5 sites, Flu A at 0 of 5 sites, RSV at 0 of 5 sites. COVID-19 was High or Very High at 20% of the state's sampling sites. Source: CDC wastewater surveillance.
Very High High Moderate Low Very Low
Sampling sites in Massachusetts 5
| Counties served | People served | COVID-19 | Flu A | RSV |
|---|---|---|---|---|
| Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 2,400,000 | Low | Low | Very Low |
| Middlesex, Suffolk | 1,375,228 | High | Very Low | Very Low |
| Middlesex, Norfolk, Suffolk | 1,075,656 | Moderate | Very Low | Very Low |
| Worcester | 260,000 | Moderate | Very Low | Very Low |
| Worcester | 9,240 | Very Low | Very Low | Very Low |
When levels are high where you live
- Stay current on vaccines for COVID-19 and flu, and RSV if you are 75+, 50–74 with risk factors, pregnant, or have an infant.
- Test if you have symptoms; antivirals for COVID-19 and flu work best in the first days and are meant for people at higher risk.
- A well-fitting mask in crowded indoor places and better ventilation cut the risk for you and for people around you.
- Stay home when sick. Outbreak news is in our epidemic record.
What this page shows, and what it misses
CDC's weekly wastewater viral activity level for each sampling site — a treatment plant or a point upstream — compared with that site's own baseline, in five categories from Very Low to Very High. State rows count sites; CDC's own state level, on its map, weighs sites differently and can differ from what these counts suggest. Places not on a sewer system, and sites that did not report this week, are not covered. Wastewater shows community spread, not the number of cases.
Data: Centers for Disease Control and Prevention, National Wastewater Surveillance System, "CDC Wastewater Viral Activity Level for SARS-CoV-2, Influenza A and RSV" (data.cdc.gov) — public domain U.S. Government work.