The MEPA Office is continuing to engage in a regulatory review effort to update its regulations at 301 CMR 11.00 and associated policies and guidance.

This regulatory review effort coincides with statewide initiatives led by EEA under Governor Baker’s Executive Order 569 to prepare for the impacts of climate change.

Prior Regulations

MEPA regulations were last amended on May 10, 2013.

301 CMR 11.00 

Amendments Effective December 24, 2021

*As filed with the Secretary of State’s Office on December 10, 2021

The complete regulations are available here

Updated Presentation:  English | Español | Português | 中文 | Kreyòl Ayisyen | Tiếng Việt
Video Recordings (translations available upon request): NAIOP, EBC

Virtual Public Hearings Held: October 12-13, 15 2021

Public Comments Received Can Be Viewed HERE.

MEPA Advisory Committee

The MEPA Office is engaged in a “Phase 2” regulatory review effort to consider additional updates to MEPA regulations. The Office has formed an advisory committee to guide this effort.

A list of represented organizations and dates of public meetings can be found here.

Environmental Justice Protocols

The transitional rules regarding environmental justice outreach were RESCINDED on January 1, 2022.

UPDATED Presentation: English | Español | Português | 中文 | Kreyòl Ayisyen | Tiếng Việt
Video Recordings (translations available upon request): NAIOP, EBC

The MEPA Office has finalized two MEPA Environmental Justice Protocols to take effect on January 1, 2022. These protocols will supplement proposed amendments to MEPA regulations at 301 CMR 11.00, which were promulgated on December 24, 2021.

Comments received on MEPA environmental justice protocols are available below:

The text of the MEPA environmental justice protocols can be found below:

Cumulative Impacts Analysis

In March 2021, Governor Baker signed Chapter 8 of the Acts of 2021, An Act Creating a Next Generation Roadmap for Massachusetts Climate Policy. The Act requires the MEPA Office to develop new regulations by the end of 2021 that would require:

  • Submission of an environmental impact report (EIR) for any project that is likely to cause damage to the environment and is located near an environmental justice (EJ) population;
  • Assessment of potential existing unfair or inequitable environmental burden and related public health consequences for the EJ population; and
  • Analysis of how the proposed project might result in a disproportionate adverse effect on the EJ population.

The Act also directed the Department of Environmental Protection (MassDEP) to incorporate cumulative impact analysis (CIA) for certain categories of air permits and approvals. MassDEP was directed to propose regulations for accomplishing this goal by 2022.

The MEPA Office will participate in MassDEP's stakeholder effort to evaluate and seek public comment on development of a CIA methodology. More information is available here

Ways to Participate in MEPA Regulatory Review Effort

Public comments or other inquiries about the MEPA regulatory review process can be sent to

Please note that all comments received by the MEPA office, including the email address and contact information of the sender, will be treated as public records under state and federal public records law.

To subscribe and receive regular updates regarding the MEPA regulatory review effort, please send a blank email  to Please ensure that both the subject line and the body of the email are blank and that the email does not contain an automatic signature or your email address will not be added to the listserv. If you receive an error message, please contact

Ongoing updates of the MEPA regulatory review effort, including additional opportunities for public participation, will be posted on this page.