Regulation 310 CMR 15.000: Septic Systems ("Title 5")

This regulation governs the construction and maintenance of septic systems and the transport of septic-system waste.

Contact for 310 CMR 15.000: Septic Systems ("Title 5")

Septic Systems / Title 5 Contact Information

Table of Contents

Current Regulation

These regulations, 310 CMR 15.000, became effective as of September 9, 2016.

Proposed Amendments & Public Comment

MassDEP is proposing amendments to 310 CMR 15.000 in order to reduce nitrogen loads in the Commonwealth's estuaries and embayments.

Frequently Asked Questions: English | EspañolPortuguês

Background Document

MassDEP Nitrogen Sensitive Area Online Viewer with Address Lookup

Natural Resource Area NSA Map - November 2022

Public Hearings and Public Comment Period

MassDEP conducted five public hearings in 2022 and 2023:

Public Hearing Notice: EnglishEspañol | 中文 | 中文(繁體) | Kreyòl Ayisyen | ភាសាខ្មែរ | Português | Tiếng Việt

REVISED Public Notice with extension of written comment period: English | Español | 中文 | 中文(繁體) | Kreyòl Ayisyen | ភាសាខ្មែរ | Português | Tiếng Việt

Written comments will now be accepted until 5:00 p.m. on January 30, 2023. Please note that this is an extension upon the previous deadline of 5:00 p.m. on December 16, 2022. All comments submitted must include the name and contact information of the person providing the comments. Please submit comment by e-mail to and include Title 5 & Watershed Permit in the subject line. Written comments may also be submitted by mail and should be sent to:

MassDEP, Bureau of Water Resources – Division of Watershed Management
Attention: Title 5 & Watershed Permit
100 Cambridge Street, 9th Floor
Boston, MA 02114

Public Information Webinars

MassDEP conducted four public information sessions in 2022 and 2023:

Presentation - Title 5 and Watershed Permitting Proposed Draft Regulations Overview: English | EspañolPortuguês

Proposed Revisions

Notice to Reviewers

310 CMR 15.000 Proposed Revisions: Redline-Strikeout

310 CMR 15.000 Proposed Revisions: Clean

Information on Funding Sources

Information on Funding Sources

See also: Proposed Watershed Permit Regulations, 314 CMR 21.00

Recently Promulgated Amendments

Strategy for Nitrogen Impaired Estuaries

Title 5/Groundwater Stakeholder Group

Presented at the October 8, 2020 Stakeholder Group Meeting
Video of October 8 Stakeholder Group Meeting

Title 5/Groundwater Stakeholder Group Comments
During MassDEP's regulatory review efforts under Executive Order 562, a number of stakeholders asked MassDEP to consider changes to the Title 5 regulations and related changes to the Groundwater Discharge Permitting regulations. This document shows the requests as they were presented to MassDEP.

Title 5/Groundwater Stakeholder Group Regulatory Review Presentation
The first in a series of stakeholder meeting presentations to review comments received during the MassDEP Regulatory Reform sessions for Title 5 & Groundwater Discharge Permits. 

Synopsis of Suggested Regulation Revisions from External Stakeholders for Title 5 & Groundwater Discharge Permits
Compilation of comments from the first external stakeholder group meeting.

2017 Title 5/Groundwater Stakeholder Group Submittals
Reports, emailed comments, and information submitted by Stakeholders following the discussions at the first meeting.

Downloads for 310 CMR 15.000: Septic Systems ("Title 5")

Contact for 310 CMR 15.000: Septic Systems ("Title 5")

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