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.

This is an unofficial version of Commonwealth regulations and is posted here for the convenience of the public. It is not an official statement of the regulations.

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, were amended and became effective as of July 7, 2023.  See links below for final amendments to these regulations.  

Recently Promulgated Amendments - Nitrogen Sensitive Area Provisions

Nitrogen Sensitive Area Amendments

MassDEP issued amendments to 310 CMR 15.000, effective July 7, 2023, in order to reduce nitrogen loads for coastal estuaries and embayments on Cape Cod.

Response to Comments

Table of Revisions in Response to Comments

Frequently Asked Questions  (EspañolPortuguês)

Map with Address Lookup

Information on Funding Sources

See also: Watershed Permit Regulations, 314 CMR 21.00

    Archived Recordings and Documents

    Title 5 Advisory Committee Meeting:

    Public Hearings

    Public Information Sessions:

    See also: Watershed Permit Regulations, 314 CMR 21.00

    Strategy for Nitrogen Impaired Estuaries

    Title 5/Groundwater Stakeholder Group

    Presented at the October 8, 2020 Stakeholder Group Meeting:

    Meeting Recording | Meeting Presentation

    Stakeholder Comments and Submittals

    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.

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

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

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