The Department of Public Safety provides patrol officers, school resource officers and detective services to handle investigations within certain Westchester municipalities under an Inter-Municipal Agreement (IMA) with each community. With the county police providing communications and supervision from its existing resources, the arrangement enables the municipality to achieve substantial savings annually as compared to maintaining its own police department.

The Department of Public Safety currently patrols the Town of Cortlandt and provides school resource officers to the Lakeland, North Salem and Somers school districts. It also handles dispatching and communications for the Tuckahoe Police Department on the overnight tour.