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The EPA has varying regulations for engines of all sizes on land, air, and sea. In 2002, the regulations regarding marine diesel engines changed to include previously excluded recreational vessels. This means that the majority of vessels on the water, even smaller noncommercial vessels, must meet EPA standards. Our marine engine service experts are here to help you understand and meet EPA marine emissions standards.

What Vessels Need to Meet EPA Marine Emissions Standards?

Previously, the EPA had strict regulations for Tier 3 vessels, which had mainly larger commercial marine diesel engines. Today, the EPA has diesel engine emissions standards for recreational Tier 1 and Tier 2 engines as well, which includes engines with 40 to 94 CFR.1 Additionally, to be considered a recreational engine, the marine diesel engine must be at or above 37kW and less than 5 liters per cylinder displacement. Beginning in 2004, all new US vessels must adhere to EPA standards, and vessels receiving new engines need to meet new standards.

What Are the EPA Marine Admissions Standards?

The EPA has specific requirements for vessels that now fall under its regulations. Specific recreational marine diesel emission standards include:

  • No more than 7.5 HC+NOX g/kW-hr, 7.2 is the limit for most marine diesel engines
  • 20-0.40 PM g/kW-hr depending on engine kW disp.
  • A limit of 5.0 CO g/kW-hr

Engines are required to have systems in place to reduce fuel usage, reduce waste, and reduce noise.2 Unlike other vessels, smaller marine diesel engines are not be required to maintain diagnostic systems in relation to EPA efficiency, though diagnostic systems can help ensure an engine runs properly overall.2

Who is Responsible for Meeting EPA Marine Emissions Standards?

Manufacturers are those who are often held the most accountable for meeting EPA standards. When buying a new engine or undergoing a MAN engine rebuild, check to ensure that the engine meets EPA standards. We offer marine engine service, maintenance, and parts to help ensure your engine runs as efficiently as possible. Contact us today to learn more about EPA standards, MAN boat engines, and your vessel’s emissions.