New York Adopts Mandatory Greenhouse Gas Reporting Program

On December 1, 2025, the New York State Department of Environmental Conservation (DEC) adopted regulations establishing a mandatory greenhouse gas (GHG) reporting program.¹ DEC enacted Part 253 pursuant to the State's Climate Leadership and Community Protection Act (CLCPA), which instituted a state-wide goal to reduce GHG emissions by 40% by 2030.² With adoption of this rule, New York becomes the third state—alongside California³ and Washington⁴—to implement widely applicable GHG reporting requirements.

Part 253 establishes annual reporting requirements for a wide range of emissions sources operating in New York that meet or exceed specified thresholds. Entities exceeding the emissions thresholds must also verify their emissions data using a DEC-accredited third-party verification service. Part 253 is a data-collection program only; it does not impose emission reduction requirements or require regulated entities to obtain emission allowances. Initial reports under