WS 21: Approval to Conduct Pilot Study

Approval to conduct a pilot study to determine the adequacy of the treatment process

MassDEP Drinking Water Program

The Details

What you need

This approval serves to protect the public health and welfare by assuring that the pilot study follows the procedures set forth in the Division of Water Supply's Guidelines and Policies for Public Water Systems (available from the State House Bookstore) and that the finished water will meet minimum drinking water standards.

This permit consists of an approval to conduct a pilot study to determine the adequacy of the treatment process to deliver water of good quality that meets the standards established by MassDEP. Legislative authority is stated in MGL Chapter 111, s. 160A and regulatory authority is stated in 310 CMR 22.04 of the Drinking Water Regulations.

Public water suppliers or their representatives must apply if they plan to conduct water treatment pilot studies on their drinking water systems.

If the water supplier or their representative apply for this permit as part of a facility modification, it may be necessary to apply for other water treatment permits, e.g. WS 22, 23, 24, or 25.

Note: Approvals of this type may require MEPA review. Please carefully examine 301 CMR 11.00, the MEPA Regulations, to determine if your project exceeds the MEPA review thresholds, or for more information contact the MEPA Unit of the Executive Office of Environmental Affairs (100 Cambridge Street, Boston, MA 02202; (617-727-5830). MassDEP cannot begin technical review of the application until the MEPA process has been completed, unless otherwise agreed to in writing. Copies of MEPA filings (with reference to any applicable Transmittal numbers) should be sent to the appropriate program offices in Boston and the MEPA Coordinator in the appropriate Regional Office.

How to apply

See details below.

Next steps

  1. Review the Instructions

    Guidance on how to prepare your application, including a completeness checklist.

  2. Complete the Application Form

    You may fill out and save the Microsoft Word form on your computer. The PDF version has to be printed out and completed by hand.

  3. Obtain a Transmittal Form and Number

    A unique Transmittal Number is needed for each application you submit to MassDEP.

  4. Lookup the Permit Application Fee

  5. Mail Your Application and Fee Payment

    Submit your application fee payment and a copy of your Transmittal Form to:

    Department of Environmental Protection
    PO Box 4062
    Boston, MA 02211

    Submit your completed, signed application and your original Transmittal Form to the appropriate MassDEP Regional Office (see listing below).


MassDEP Boston
1 Winter Street, Boston, MA 02108


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