WP 56: Industrial Wastewater Holding Tank Compliance Certification

Use this form to certify that your facility complies with the industrial-wastewater holding tanks regulation.

314 CMR 18.00 Contact Information

The Details

What you need

Holding tanks, mobile tanks, and containers are common in industrial settings and may be regulated by other programs depending upon the specific situation. Before you file, it is important to determine if 314 CMR 18.00 applies to you and whether you qualify for certain exemptions.

The regulation applies to holding tanks, mobile tanks, and containers that meet all three of the following criteria.

  1. The vessel is used exclusively to accumulate or store industrial wastewater generated on-site or off-site.
    For example, if you use your holding tank, mobile tank, or container within a production process or within a wastewater treatment system, then this regulation does not apply to you.  
  2. The industrial wastewater in the vessel will be transported directly to an off-site facility for recycling, treatment, or disposal.
    For example, if your holding tank, mobile tank, or container is used to transfer industrial wastewater within or between your production process (es) or treatment system(s), then this regulation does not apply to you.
  3. The wastewater accumulated or stored in the vessel is non-hazardous, non-domestic industrial wastewater.
    For example, if the industrial wastewater in the holding tank, mobile tank, or container is hazardous industrial wastewater or domestic wastewater, then this regulation does not apply to you.

Please note that under criteria 1 and 2 above, 314 CMR 18.00 does not apply to tanks that are used to hold wastewater before it is discharged to a municipal sewer system. Such tanks may be regulated through industrial wastewater discharge permits and plan approvals under 314 CMR 7.00 and 12.00.

If your holding tank, mobile tank, or container does not meet all three of the applicability criteria above, you may stop here because 314 CMR 18.00 does not apply to you.

How to file

See details in Step 5 below.

Next steps

  1. Review the Instructions

    Guidance on how to prepare your certification, 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. Look up the Permit Application Fee

    See under "WP56" in the file below.

  5. Mail your Certification and Fee Payment

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

    Department of Environmental Protection
    PO Box 4062
    Boston, MA 02211

    Submit your completed, signed certification package and original Transmittal Form to MassDEP at:

    Wastewater Management Program
    One Winter Street, 5th floor
    Boston, MA 02108

More info

If you identify compliance problems at your facility, you must file a Return to Compliance Plan (RTC) for each of the problems, along with your Compliance Certification. See the Instructions above before filling out the RTC form.



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


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