Guide MassDEP Source Registration

Facilities with potential emissions or heat input capacities above specific thresholds, or that fall within certain categories, are required to file. MassDEP may also direct others to file even if they do not meet regulatory criteria.

News & Updates

  • MassDEP anticipates new Source Registration web forms - including those for Greenhouse Gas Emissions Reporting - to be available by late winter 2018.
  • Due to the forms delay, MassDEP is deferring 2016 reporting for triennial filers to the 2017 reporting year.
  • Annual filers must still submit for 2016 and MassDEP will notify them of their reporting deadlines.
  • The agency will likewise notify facilities required to submit 2017 Source Registrations of their filing deadlines.
  • MassDEP is unable to accept 2016 and 2017 Source Registrations at the same time. The agency needs to receive and process 2016 reports before 2017 filing can begin.

Who Needs to File & When

Source Registration is due annually or every three years, depending on the facility.

Source Registration reporting provides MassDEP with valuable information on air pollution sources, their emissions, and their effects on ambient air quality across Massachusetts. This information is also used for program planning, technical assistance targeting, state and federal emissions inventories, and state implementation plans (SIPs).

Facilities with potential emissions or heat input capacities above thresholds specified in the regulations are required to file. So, too, are facilities that fall within certain categories. Most incinerators are required to file, for example. MassDEP may also direct a facility to file even if it does not meet any of the regulatory criteria. See 310 CMR 7.00: Air Pollution Control (specifically, 310 CMR 7.12: U Source Registration) for details.

A list of all facilities subject to Source Registration requirements, including their individual filing deadlines, can be found in Additional Resources below. MassDEP also generally informs all facilities of their filing deadlines by letter.

Additional Resources

References You Will Need

Once you login to the eDEP Online Filing system, you will need to enter or confirm information about your facility, its operations and emissions, including the following specific references.

  • Source Classification Codes (SCCs): These codes are used by the U.S. Environmental Protection Agency (EPA) to categorize sources of air pollution and their associated emission factors, if available. To select an SCC for your emissions unit, follow the links in Additional Resources below to the MassDEP spreadsheet or the EPA Source Classification Codes.
  • Emission Factors: MassDEP Source Registration uses a subset of EPA emission factors to calculate combustion unit emissions. Although eDEP performs these calculations automatically based on the SCC you enter, you may choose to perform your own calculations. See the EPA Clearinghouse for Inventories & Emission Factors in Additional Resources below.
  • North American Industry Classification System (NAICS) Codes: Developed jointly by the United States, Canada and Mexico, NAICS has replaced the U.S. Standard Industrial Classification (SIC) system as the benchmark for classifying business activity across North America. To find your company's NAICS Code(s), check the Principal Business Activity Codes field on your federal tax return or use the NAICS Keyword Search in Additional Resources below.

If your facility has never filed a Source Registration before, it may first need to be added to the MassDEP database. Please email the Source Registration Help Desk with the facility's name, physical and mailing addresses, and federal taxpayer identification number, as well as a contact information. MassDEP will reply with eDEP Online Filing system instructions.

Additional Resources

How to File Your Source Registration

Use the eDEP Online Filing system to submit your Source Registration annual or triennial report. Please note that if you are a new eDEP user, you will need to create an account first.

See Additional Resources below for:

  • Field-by-field instructions on how to complete and file your Source Registration.
  • Guidance, hints and tips based on SR Help Desk interaction with filers.

If you are a new Source Registration filer, pay specific attention to the Read This First fact sheet and Quick Start guide to save time.

Tips from the SR Help Desk answers common questions, as well as, how to handle unusual facility types and insignificant non-reportable uses.

Additional Resources


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