Requires owners and operators of certain landfills to control and monitor landfill gas emissions.

S 637 requires owners and operators of certain sanitary landfills (those authorized to accept solid waste for final disposal or closing after the law takes effect) to control and monitor methane emissions. Key provisions include installing and operating a landfill gas collection system meeting specific standards, conducting quarterly methane surface monitoring, and ensuring emissions stay below 500 parts per million at any single point or 25 parts per million on average across the facility. Owners must also submit annual methane generation estimates and maintain records for the New Jersey Department of Environmental Protection. The law takes effect 24 months after enactment, with penalties for violations including fines up to $50,000 per day.