New RICE Rules for MACT Standards and Compliance

The new RICE NESHAP (National Emissions Standards for Hazardous Air Pollutants) rules affect engines used for generators, pumps, compressors, and other common plant equipment, as part of the larger Maximum Achievable Control Technology (MACT) standards. The requirements’ full compliance date is May 3, 2013, for diesel (CI) engines and October 19, 2013, for gasoline and natural gas (SI) engines. However, the startup, shutdown, and malfunction (SSM) requirements have been applicable since the rule effective dates of May 3, 2010, and October 19, 2010, respectively.

The federal Clean Air Act has severe penalties for non-compliance, including costly fines and criminal penalties. Nearly 1 million existing, stationary diesel engines are affected by new federal air quality rules, in addition to more than 300,000 gasoline, propane, and natural gas engines.

Subpart ZZZZ establishes national emission limitations and operating limitations for hazardous air pollutants (HAP) emitted from stationary reciprocating internal combustion engines (RICE) located at major and area sources of HAP emissions. This subpart also establishes requirements to demonstrate initial and continuous compliance with the emission limitations and operating limitations.

  • Covers Reciprocal Internal Combustion Engines (RICE units)
  • Affected RICE units
    • Area source engines
    • Major source engines with site rating of less than 500 horsepower
  • New units MUST comply within 180 days of construction.
  • Compliance can be met in two ways
    • Certification from the manufacturer
    • Develop a maintenance plan and conduct emission testing
Check your applicability with this online tool: RICE RuleFor existing units, compliance dates can be variable, so we recommend that you download the excel sheet linked here: Compliance Dates for Various Sources


Environmental Source Samplers (ESS) specializes in stack testing and source testing for a wide range of industries and sources.  They are experienced in EPA test methodologies and stay up-to-date on new rules and compliance regulations.  Contact ESS today to learn more: (910) 799-1055 .

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Brian Mellor About Brian Mellor

Brian Mellor works with Environmental Source Samplers, Inc. (ESS), an environmental consulting firm specializing in stack testing, CEMS Testing, and EPA air emissions compliance.

ESS has conducted international stack testing projects at Johnson Atoll, in the Philippines, the Dominican Republic, Hong Kong, and various parts of Europe. If you need a team that will do your international job with efficiency and effectiveness, call ESS at (910) 799-1055 or visit