COVID Levels in New Hampshire
In the week ending 10 October 2026, wastewater virus levels in New Hampshire were High or Very High for COVID-19 at 5 of 15 sites, Flu A at 1 of 15 sites, RSV at 0 of 15 sites. COVID-19 was High or Very High at 33% of the state's sampling sites. Source: CDC wastewater surveillance.
Very High High Moderate Low Very Low
Sampling sites in New Hampshire 15
| Counties served | People served | COVID-19 | Flu A | RSV |
|---|---|---|---|---|
| Hillsborough | 172,000 | Low | Very Low | Low |
| Hillsborough | 90,000 | High | Very Low | Very Low |
| Rockingham | 40,000 | Very High | Very Low | Low |
| Hillsborough | 40,000 | Low | Very Low | Very Low |
| Strafford | 33,000 | Low | Very Low | Very Low |
| Cheshire | 30,000 | High | Very Low | Low |
| Hillsborough | 26,632 | Very Low | Very Low | Low |
| Rockingham | 20,000 | Moderate | Very Low | Low |
| Strafford | 14,923 | High | Low | Low |
| Grafton | 11,000 | Low | High | Low |
| Coos | 9,000 | Low | Very Low | Low |
| Grafton | 7,000 | Very Low | Very Low | Low |
| Sullivan | 6,500 | Low | Very Low | Low |
| Rockingham | 5,000 | Low | Very Low | Very Low |
| Rockingham | 3,500 | High | Low | 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.