The Rockland County Department of Health has free Mosquito Dunks available for use in Rocklander's private, closed, or unused swimming pools.

Free Mosquito Dunks from the County Health Department are available, while supplies last. Mosquito Dunks are small, donut-shaped objects that float on standing water and release bacteria that kill mosquitoes in the water before they grow into adults. The Health Department provides the Mosquito Dunks to Rockland residents to use in closed or unused private swimming pools, ponds, and spas. The dunks are effective on wet surfaces for roughly 30 days. A single dunk will treat about 100 square feet of standing water.