Mosquito borne diseases

Mosquito Control and Surveillance


Nassau County Department of Public Works (DPW) is responsible for mosquito control which includes the application of larvicides and adulticides. DPW monitors thousands of street basins, sumps, ponds, and hundreds of miles of fresh water streams. Breeding sites are inspected for the presence of larvae. Ditches are maintained 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 on the south shore salt marshes to control populations of salt marsh mosquitoes.

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

(516) 571-6900

Nassau County Department of Health conducts mosquito surveillance activities at forty-two (42) trap sites throughout the County. Surveillance activities include:

Collecting, identifying species, and sending to New York State Department of Health laboratory for viral testing; determining population distribution, and thoroughly investigating all cases of suspect or confirmed West Nile virus, Zika virus, and other mosquito-borne diseases 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.

New York State Department of Health for Medical Consultation
1-888-364-4723 Monday-Friday 9am-5pm

Nassau County Bureau of Communicable Disease Control
(516) 227-9639 Monday-Friday 9am-4:45pm

Nassau County Department of Health Zika Action Plan

Links to External Websites With More Information About Zika virus:

Centers For Disease Control and Prevention

New York State Department of Health