WP 91, 92: Permit for Industrial Sewer User

These permits are for industrial facilities discharging wastewater to Publicly Owned Treatment Works.

WP 91, 92 Contact Information

The Details

What you need

WP 92 covers specific industrial facilities with sewer connections for discharging greater than 25,000 gallons per day to Publicly Owned Treatment Works (POTW) without Industrial Pretreatment Programs (IPP). IPPs are industrial sewer discharge permit programs operated by POTWs as required by their federally-issued National Pollution Discharge Elimination System (NPDES) permit.

WP 91 covers Special Sewer Connection Permit for Industrial Sewer User other than BRP WP 92. This permit is only determined by MassDEP.


How to apply

See details in Step 5 below.

Next steps

  1. Review the Instructions

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

  2. Complete the Application Form

  3. Obtain a Transmittal Form and Number

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

  4. Look up the Permit Application Fee

    The fees for WP 91 and WP 92 are on page 5 of the fee schedule below.

  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

    For WP 91:

    Submit your completed, signed application and transmittal form to the appropriate MassDEP Regional Office (see listing below).

    For WP 92:

    Submit your completed, signed application and transmittal form to:

    Department of Environmental Protection
    Wastewater Management Program
    One Winter Street, 5th floor
    Boston, MA 02108

    Also send a copy of WP 92 to the appropriate MassDEP Regional Office.

More info

Holding tanks, mobile tanks and containers are commonly used by commercial, industrial, institutional and municipal facilities - particularly in areas not served by sewers - to store wastewater for off-site disposal, recycling or treatment. Depending on storage vessel functions, wastewater characteristics and facility locations, these tanks and containers may be subject to different federal and state regulations.

All owners and operators of industrial wastewater holding tanks (IWHTs), mobile tanks and containers used exclusively to accumulate or store non-hazardous, non-sanitary wastewater are required to comply with the provisions of 314 CMR 18.00, the Industrial Wastewater Holding Tanks regulation. The regulation applies only to facilities that store non-hazardous, non-sanitary wastewater in IWHTs, mobile tanks or containers and intend to truck it directly off-site for disposal, recycling or treatment. The rule establishes specific construction and operation standards, record-keeping requirements and decommissioning procedures for these industrial wastewater storage vessels.

The regulation does not apply to tanks and containers that are used for:

  • Sanitary wastewater storage regulated under 310 CMR 15.00 (Title 5)
  • Production processes and wastewater treatment systems
  • Non-contact cooling water or heating or cooling condensate storage
  • Waste site cleanup projects regulated under 310 CMR 40.0000
  • Hazardous waste storage regulated under 310 CMR 30.000
  • Facilities regulated under the MassDEP Environmental Results Program (dry cleaners, photo processors and printers)


1 Winter Street, 5th floor, Boston, MA 02108


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