Mosquito Information

Mosquito Control and Related Health Concerns





Posting a 'No Spray' sign on your property

will not exclude your property from Mosquito spray.


Phone calls requesting "No Spray" will no longer be


According to the MA 333 CMR13.03, paragraphs 1b and 1c,

all requests for mosquito spray exclusion must be delivered

to the Town Clerk via certified mail before March 1, 2016.


Please Note change of address:

Beth Willis, Town Clerk

Town of Topsfield

461 E-6 Boston Street

Topsfield, MA 01983



Click here for NEMMC Exclusion Request Letter Template


Click here to read the Press Release


Click here to read the Regulation


Click here to read 2016 Vector Management Plan


Click here to read the 2016 Best Management Practice Plan

for Topsfield




2016 Mosquito Season Findings - Weekly Reports


Week of 7-25-16


-No mosquitoes have been trapped in Topsfield and tested positive for

Eastern Equine Encephalitis Virus (EEEV) or West Nile Virus (WNV).

-No such mosquitoes have been trapped north of Malden.

-It is likely that Northeastern MA will experience the usual occurrence of EEEV and WNV. The current warm weather and pattern of precipitation events are continuing to produce large mosquito populations among species most likely to spread WNV.

-Teach children the importance of using repellants only according to manufacturers’ recommendations.

-Repair Screens.

-Remove standing water and report such situations, including unused swimming pools.

-If area residents choose to travel, follow CDC Guidelines found at


Week of 7-11-16:



Note: no human or animal cases of WNV or EEE have been detected so far this year.

Residents are urged to take the precautions listed below.


Week of 6-20-16:

No positive samples of EEEV or WNV state-wide.

  • The current warm weather and pattern of precipitation events are likely to support increased mosquito populations.
  • Establish good habits:

-Use a repellant with EPA-approved ingredients.

-Dress appropriately, covering as much as possible.

-Repair screens.

-Remove standing water.

-Teach children to adopt these good habits.


2015 Mosquito Season Findings PDF


2014 Mosquito Season Findings PDF



2013 Mosquito Season Findings PDF





 1. Be aware that mosquitoes are most active between dusk and dawn. Take precautions to

  minimize exposure during these hours.

  2. Long sleeves and long pants can minimize risk of mosquito bites.

  3.   Insect Repellents including DEET (N, N-diethyl-m-toluamide), permethrin, picaridin (KBR 3023), IR3535 or oil of lemon eucalyptus [(p-methane 3, 8-diol (PMD)] should be used according to directions.

NOTE: DEET products should not be used on infants under 2 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. Permethrin Products are intended for use on items such a clothing, shoes, bed nets and camping gear and should not be applied directly to the skin.

4. Remove standing water in your yard where mosquitoes may breed.

Topsfield's Risk Level for West Nile remains LOW.

Topsfield Board Of Health’s approach remains on surveillance and education.



Links to Information On Mosquitoes and Mosquito-Borne Illness:





Tick Borne Disease