Domestic Regulations for Emissions from Marine Compression-ignition (Diesel) Engines

• Overview
• List of related e-CFR links
• List of related regulations

EPA is amending the national marine diesel engine program to provide relief provisions to address concerns associated with obtaining and installing certified Tier 4 marine diesel engines in certain high-speed commercial vessels. The relief is in the form of additional lead time for qualifying engines and vessels. EPA is also modifying the marine diesel engine certification program by streamlining engine certification requirements.  These changes will promote Tier 4 certification of engines with high power density.

Overview

EPA has adopted exhaust emission standards for marine diesel engines installed in a variety of marine vessels ranging in size and application from small recreational vessels to tugboats and large ocean-going vessels.

These domestic emission standards apply for engines installed on U.S. vessels.

Additional international requirements may apply for engines installed on U.S. vessels that operate in foreign ports and waters and for foreign vessels.

• International standards to reduce emissions from marine diesel engines and their fuels

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List of Related e-CFR Links

See the Electronic Code of Federal Regulations (e-CFR) for the full text of current domestic regulations that apply to marine diesel engines and vessels.

List of Related Regulations

Below is a list of all domestic regulations related to emissions from marine compression-ignition (diesel) engines. 

• Rule summaries;
• Regulatory impact analyses;
• Comment summaries;
• Rule histories (including proposed rules); and 
• Fact sheets.*

*Note: Rule-related materials vary by rule.