aerial map of weston

Additional Mosquito Spraying: 

  • Fly-over spraying is ongoing 

  • Field perimeter treatment at school and recreation fields

  • Anticipated Truck-mounted spraying next week

  • Residents urged to continue to protect themselves against mosquito bites

The state's plan to conduct additional aerial spraying for EEE in critical and high risk communities is ongoing. The western portion of Weston (approximately running from Sudbury/Concord Rd. intersection to the Glen/Cliff Rd. intersection) is included in the aerial spraying map; however, operations were suspended on Tuesday due to weather conditions. Spraying occurs between 7:15 p.m. and 4:30 a.m. and can take up to six days to complete, as it is weather and equipment dependent.

Residents are urged to continue to protect themselves against mosquito bites. Information can be found below. Aerial, truck-mounted, and perimeter treatments are conducted to reduce human risk but it does not eliminate it. More information on EEE can be found below.

Field Perimeter Treatment

Weston is listed as a moderate risk community for EEE; however, it abuts higher risk communities to the west. As such, Weston's Board of Health and the Facilities Department, working with the School and Recreation departments, have arranged for mosquito treatment at the perimeter of the school playing fields and the recreation fields as additional precaution.

This ground-level treatment, which is being conducted by the East Middlesex Mosquito Control Project, has commenced and will continue on Friday. The emergency waivers and application spec sheets are available online for review. The High School and Middle School fields will be treated 24-hours after the aerial spraying by the state.

Elementary early-morning recess will continue to be held indoors and outside activities will end by 6:00 p.m. until School Administrators are advised otherwise by Weston's Board of Health. 

Anticipated Truck-mounted Spraying
Town Officials are working with the East Middlesex Mosquito Control Project to have another round of truck-mounted spraying next week on Tuesday, September 17th. The spraying would be conducted in the neighborhoods north of Boston Post Road, including Merriam Street, Conant Road, Church Street, Kings Grant Road, Montvale Road, Lexington Street, and Rolling Lane. The postponement date is Thursday, September 19th. Additional information, including the schedule and product information is available on the East Middlesex Mosquito Control Project's website:

Aerial Spray Map & Updates

For the latest aerial spray updates, please refer to the Mass. Department of Agricultural Resources' online Aerial Spray Map for September 2019

  • The map will display a polygon representing the areas to be sprayed. The map is searchable by address—residents can enter 02493 or their address to determine if they are in the spray zone
  • The map is color-coded to highlight what area has been sprayed within the zone
  • The map will be updated each day. Please note map preparation takes time and may result in some delays in posting
  • Communities in Middlesex County that are scheduled to be partially or fully sprayed over the next week are: Ashland; Hopkinton; Holliston; Sherborn; Framingham; Natick; Wayland; Sudbury; Maynard; Stow; Hudson; Marlborough; and Weston

Aerial Spraying Information

Mosquito control professionals will be applying approved pesticides as an ultra low volume (ULV) spray. ULV sprayers dispense very fine aerosol droplets that stay aloft and kill adult mosquitoes on contact. The active ingredients of the pesticide product generally break down quickly and leave no residue.

Per the state Department of Health, precautionary steps during spraying are not necessary; however, the following steps can be taken during aerial spraying times:
  • Close windows and turn off fans in spray areas. Shut off air conditioners unless they have a setting for recirculating indoor air. In very hot weather, you can open the windows or turn fans and air conditioners back on soon after the aerial spraying is completed.
  • Keep pets indoors during spraying.  Although pets that remain outdoors could be exposed to small amounts of Anvil 10+10, they are not expected to experience adverse health effects from the spraying.  There are many pesticide products (e.g., flea collars, pet shampoo, dips) containing  similar ingredients that are used directly on pets to control ticks and insects.
  • If clothes or outdoor items are exposed during spraying, wash them with soap and water.
Aerial spraying is considered necessary to reduce human risk, but it will not eliminate risk. It is critical that residents continue to protect themselves from mosquito bites (info further down). For more FAQs regarding aerial spraying, please refer to the state's website

Information on the Department of Public Health Website

The state Department of Health maintains the latest information on EEE in Massachusetts on its website. Here, residents can find information on:

  • The risk of EEE
  • September 2019 aerial spraying information
  • Recommended cancellation times for outdoor activities in high risk areas
  • Frequently asked questions about mosquito control
  • Printable fact sheets
So far this season, Massachusetts has had seven human cases of EEE and includes one death. There have also been nine confirmed cases of EEE in animals, including eight horses and a goat. The Department of Agricultural Resources reminds horse owners to promptly vaccinate their horses to ensure proper protection from EEE. If your horse was already vaccinated this year, the agency advises checking with your veterinarian about a booster.

Protect Yourself Against Mosquito Bites

Currently, there are 36 communities now at critical risk, 42 at high risk, and 115 at moderate risk for the EEE virus in Massachusetts. A map of the state’s current EEE risk levels is available online. EEE is a rare but serious and potentially fatal disease that can affect people of all ages.

People have an important role to play in protecting themselves and their loved ones from illnesses caused by mosquitoes:

  • Apply Insect Repellent when Outdoors: Use a repellent with an EPA-registered ingredient (DEET (N, N-diethyl-m-toluamide), permethrin, picaridin (KBR 3023), oil of lemon eucalyptus [p-methane 3, 8-diol (PMD)] or IR3535) according to the instructions on the product label. DEET products should not be used on infants under two months of age and should be used in concentrations of 30% or less on older children. Oil of lemon eucalyptus should not be used on children under three years of age.

  • Be Aware of Peak Mosquito Hours, as well as Wooded and Wetland Areas: The hours from dusk to dawn are peak biting times for many mosquitoes. Consider rescheduling outdoor activities that occur during evening or early morning in areas of high risk. Also take precautions when in the woods or other shaded areas.

  • Clothing Can Help Reduce Mosquito Bites: Wear long-sleeves, long pants,  socks, and closed-toed shoes when outdoors will help keep mosquitoes away from your skin. 

  • Mosquito-Proof Your Home - Drain Standing Water: Mosquitoes lay their eggs in standing water. Take a look outside your home for items that hold water and drain them. Check rain gutters and drains. Empty unused flowerpots, buckets, and wading pools - especially after a rain - and change the water in birdbaths frequently

  • Install or Repair Screens: Keep mosquitoes outside by having tightly-fitting screens on all of your windows and doors.

  • Protect Your Animals: Water troughs should be flushed out at least once a week during the summer months to reduce mosquitoes near paddock areas. Horse owners should keep horses in indoor stalls at night to reduce their risk of exposure to mosquitoes. Owners should also speak with their veterinarian about mosquito repellents approved for use in animals and vaccinations to prevent WNV and EEE. If an animal is suspected of having WNV or EEE, owners are required to report to DAR, Division of Animal Health by calling 617-626-1795 and to the Department of Public Health (DPH) by calling 617-983-6800.

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