Mosquito Control

West Nile Virus General Information


Nassau County Department of Public Works (DPW) is responsible for mosquito control. This includes monitoring and treating with larvicides, when appropriate, thousands of street basins, sumps, ponds and hundreds of miles of fresh water streams; checking suspect breeding sites for the presence of larvae; and maintaining “ditches” on the county’s south shore which allow fish to reach and consume mosquito eggs, larvae and pupae. DPW will continue aerial applications of larvicide in the non-populated areas in the south shore salt marshes as needed to control populations of salt marsh mosquitoes.

Nassau County Department of Public Works (DPW) reponds to mosquito or stagnant water problems. To report a problem, please phone DPW's Mosquito Control Unit at:

(516) 571-6900

Nassau CountyDepartment of Health conducts mosquito and West Nile Virus surveillance activities at forty-two (42) trap sites throughout the County. Surveillance activities include:

identifying species; determining population distribution and abundance; separating and sending selected mosquitoes for viral testing; and thoroughly investigating all cases of suspect or confirmed encephalitis, including West Nile virus, to determine the source of infection.

For information concerning West Nile Virus activity call Nassau County Health Department Mosquito Surveillance at:

(516) 572-1211
Monday through Friday from 8:00 am until 3:45 pm.


This web site will be updated as needed.

Links to External Websites With More Information About West Nile Virus: