MS4 Stormwater Management Program

Stormwater Management Program Plan 

The Division of Environmental Resources oversees the MS4 program for implementation and enforcement of a program to attempt to reduce the discharge of pollutants from our small Non-Land Use Control MS4 to the maximum extent possible. The ultimate goal is to protect the water supply and satisfy the water quality requirements of the Environmental Conservation Law and Clean Water Act. The division inspects and maintains the county's storm sewers and outfalls located on county properties.

Rockland County Facilities Management has updated its Stormwater Management Program (SWMP) Plan to meet the requirements outlined for Year 2 of the permit term under the New York State Department of Environmental Conservation’s (NYSDEC) General Permit for Stormwater Discharges from Municipal Separate Storm Sewer Systems (MS4) (GP-0-24-001). The updated SWMP Plan, dated November 2025, is provided below for public review and comment on the County’s stormwater program.

Please submit any comments regarding the report to the County’s Stormwater Program Coordinator at: mcguink@co.rockland.ny.us.

The November 2025 SWMP Plan can be found here: Rockland County Final SWMP Plan November 2025

MS4 Annual Reports

MS4 Annual Reports can be viewed by clicking on the links below.  Please submit any comments on the MS4 Annual Reports to the County's Stormwater Program Coordinator at: mcguink@co.rockland.ny.us. 

• Rockland County Annual Report 01/03/24-01/02/25
• 2023 Annual MS4 Report
• 2022 Annual MS4 Report

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