Mosquito Information

The Massachusetts Department of Public Health, in collaboration with the State Reclamation and Mosquito Control Board (SRMCB) and regional mosquito control projects (MCP), conducts surveillance for mosquito-borne viruses that pose a risk to human health. Surveillance currently focuses on West Nile (WNV) and eastern equine encephalitis (EEE) viruses, which are found in the local environment and are capable of causing serious illness and death in humans, horses, and other mammals.

The Town of Concord contracts with East Middlesex Mosquito Control Project (EEMCP) for the following services:
  • Adult mosquito surveillance
  • Larval mosquito control with Vectolex WSP (biological agent) at 2,400 catch basins
  • Ground applications of Bti (biological agent) at wetlands to control potential mosquito larvae
EMMCP provides an integrated mosquito management program including catch basin larval control program, surveillance and trapping, wetland inspections to monitor larval populations and identify obstructions in drainage systems. At this time, the Town of Concord does not utilize aerial spraying as a means of mosquito control.

Based on mosquito surveillance and presence of animal and/or human cases of WNV and EEE, the Massachusetts  Department of Public Health updates its current  Risk Level for WNV and EEE in Concord and other towns at least weekly during the summer mosquito season.   Please see MPDH's webpage on Mosquito-Borne Diseases for more information.  


Eastern Equine Encephalitis (EEE) is a rare but serious disease caused by a virus, which is spread by infected mosquitoes. The EEE virus can cause inflammation or swelling of the brain (encephalitis). We encourage you to read the FAQ’s to learn a little more about EEE and Concord’s response in 2019 when human and veterinary cases were found in our area.

View the FAQ’s by clicking here to view the printable PDF