Massachusetts Maps EEE and West Nile Risk by Town

One town by town map shows where EEE and West Nile risk exists, based on mosquito data.

Massachusetts Maps EEE and West Nile Risk Across Towns

Massachusetts public health officials released a town by town risk map for Eastern Equine Encephalitis and West Nile virus. The map uses mosquito testing data and will be updated as new results arrive. So far this summer there have been no reported human cases of mosquito borne illnesses. Last year there were four human EEE cases in Massachusetts, the first such cluster since 2020.

Risk levels for EEE range from Remote to Critical, while West Nile uses Low to Critical. The map serves as a guide for prevention and awareness, not a forecast. Officials emphasize ongoing surveillance and remind residents to protect themselves and remove standing water as the season continues.

The data provides clear, actionable information for residents, but it also highlights the limits of maps in a changing climate. Mosquito borne risk shifts with weather, land use and human activity, so towns must pair the map with local outreach and practical steps.

Beyond numbers, the map tests how public health communicates risk. Clear definitions help, yet the real goal is to keep people safe without causing alarm. Local leaders should translate data into concrete guidance for families and outdoor workers as the season unfolds.

Highlights

Ongoing updates will show how risk shifts with the season.