Mosquito-Borne Diseases

Current risk of mosquito-bourne diseases

The Massachusetts of Department of Public Health posts information regarding mosquito-borne diseases in Massachusetts on their website at this link.  

Information on their website includes:


Seasonal mosquito control in Medfield

In Medfield, the Norfolk County Mosquito Control District conducts regular spraying to reduce the mosquito population.  

  • Truck-mounted Ultra Low Volume (ULV) aerosol applications 2025  
    • The Norfolk County Mosquito Control District will be conducting truck-based ultra low volume (ULV) aerosol applications in Medfield on Tuesday evenings each week, from after Memorial Day through mid-September, except on official holidays. These applications are conducted based on resident requests to the District and based on our arbovirus surveillance for WNv and EEE and are not town-wide each week. These applications take place after sunset until midnight. Applications are not conducted when it is raining or when it is too cold at night. Please see the NCMCD website for more information, to make an online request, or request exclusion from these applications. Norfolk County Mosquito Control.
  • Notice of Aerial Larvicide Application April 22, 2025, 
  • Medfield Map of Aerial Application Areas 2025
  • To request spraying on your street, visit their website.


General information