Connecticut Department of Energy & Environmental Protection

DEEP headquarters at 79 Elm Street in Hartford has partially re-opened to staff and members of the public as of Tuesday, February 3. The DEEP records room has re-opened. The DEEP Central Permit Processing Unit (CPPU) will be open to the public starting on Wednesday, Feb. 4. For updates, click here

General Permit for the Discharge of Dewatering and Remediation Wastewaters

Connecticut’s Dewatering and Remediation General Permit (D2R GP) provides a streamlined regulatory framework for managing the discharge of treated wastewaters into the state’s surface and ground waters. This permit supports critical environmental restoration and development projects—from petroleum storage tank replacements to large-scale construction dewatering—by establishing clear, standardized requirements for monitoring and treatment. By ensuring rigorous oversight and the use of modern safeguards, the D2R GP effectively protects human health and preserves Connecticut’s water quality, fulfilling the state’s commitment to sustainable environmental remediation.

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D2R General Permit

*Registration Opens March 1, 2026

Application Timeline & Deadlines

Deadlines for Existing Permittees

If your site was previously authorized under the 2023 Groundwater & Remediation General Permit, the following application deadlines apply:

  • Existing Discharges to POTWs Sites that were authorized to discharge to a Publicly Owned Treatment Works (POTW) under the 2023 permit must submit an application no   later than March 1, 2026 The reissued Dewatering & Remediation (D2R) General Permit no longer authorizes discharges to POTWs. A new application is required to maintain compliance
  • Existing Discharges to Surface or Ground Water Sites that were authorized to discharge to surface water or groundwater under the 2023 permit must submit an application no later than May 30, 2026

    Note: Interim permit coverage is provided if a complete and timely application is received.

  • Application for New Site New sites must apply 180 days (6 months) prior to initiating discharge

    • Application Process & How to Apply

    Explore the step-by-step Application User Guides below:

    How to Submit Your Application

    The application process is a 5-step time-sensitive process

    Step 1 Prepare, Step 2 Application Form, Step 3 Transmittal Form, Step 4 Submit Documents, Step 5 Decision

    Step 1 - Prepare 
     Review the permit and confirm eligibility requirements.

    Step 2 - Complete the Application Form 
    Refer to the Application User Guide for step-by-step instructions and the list of required
    information needed to complete the form.

    Step 3 - Submit the Application Transmittal Form
    The Application Transmittal Form allows DEEP to track fee payments and match them to the correct
    application. The Permit Application Transmittal Form is required for this general permit and must be
    submitted with your permit-specific forms. Click to download Word or PDF 

    After completing the Application Transmittal Form and required attachments, email it to:
    DEEP.CentralPermits@ct.gov

    Important: Keep a copy for your records. You will receive a confirmation email with instructions for
       submitting payment and accessing the file transfer site. Once the Application Transmittal
       Form is submitted, the remainder of the process is time-sensitive.

    Step 4 - Upload Required Documents
    Within 10 business days of submitting the Application Transmittal Form, upload all required documents
    to DEEP's File Transfer Protocol (FTP) site - File Sharing Website - using the instructions provided in
    your confirmation email.

    Critical Deadline: Applications will be closed and rejected if required documents are not received
          within 10 business days. Submit documents as soon as possible after
          submitting the Application Transmittal Form.

    Step 5 - Application Review and Decision
    DEEP will begin processing your application upon receipt of all required documents. A high volume of
    applications is expected near submission deadline, which may result in processing delays. To help
    avoid delays, submit your application well in advance of posted deadlines.

    Application Form for Dewatering and Remediation Wastewater
    Application Form Part V - Use for additional discharges as needed

    Application Attachments that must be completed and submitted:

    • Attachment A - Site Plan & Map
    • Attachment B - Coastal Consistency Review
    • Attachment C - NDDB Determination Letter
    • Attachment D - Department of Public Health Approval Letter
    • Attachment E - USGS StreamStats Low-Flow Statistics Report
    • Attachment F - Reserved
    • Attachment G - Plans and Specifications of Treatment System
    • Attachment H - Monitoring Plan
    • Attachment I - Dewatering and Remediation Screening Analysis (use prescribed form)
    • Attachment J - Analytical Lab Report
    • Attachment K - Line & Process Flow Diagram(s)
    • Attachment L - Erosion and Sediment Controls
    • Attachment M - Ground Water Monitoring Program
    • Attachment N - Subscriber Agreement (use prescribed form)
    Need Assistance with the Application

    The Industrial Water Permitting Program Team can assist with questions related to the information required by the permit. The team does not provide IT support and cannot assist with account, login, or system related issues.

    Common Omissions that Result in Processing Delays or Rejection, Applicants are encouraged to review their submission carefully prior to submission. The following are the most frequent reasons for delays or rejection. Missing or improperly signed registrant certification. Incomplete sampling data or missing analytical results demonstrating compliance with applicable effluent limits

    For Questions related to the permit:
    DEEP Industrial Permitting Team - DEEP.IndustrialNPDESCompliance@ct.gov

    For technical issues with the online application system:
    DEEP IT Support Team - DEEP.helpdesk.footprints@ct.gov

    Due to anticipated high volume of inquiries, responses may take up 2-3 business days. Your patience is appreciated.

    Applicants are encouraged to review their submission carefully prior to submission. The following are the most frequent reasons for delays or rejection.
    - Missing or improperly signed registrant certification
    - Incomplete sampling data
    - Missing analytical results demonstrating compliance with applicable effluent limits

Application Resources

What to Expect

  • Incomplete applications will result in processing delays or rejections
  • Deep expects a high volume of applications in the first year of the permit term that
    may lead to delays in processing time
  • You will receive a "Notice of Coverage" from DEEP confirming your permit coverage

What to Expect, Up to 180 days to process application, Incomplete Applications will result in processing delays or rejections, High permit volume, complete applications prioritized, Notice of Coverage letter sent by DEEP

Need to Make a Change at the Site?

Use the same form used to submit the initial application and submit a Notice of Change

 Reason for Submittal  Description/Trigger
Name Change Permittee name has changedafter the initial notification of discharge. This does
not include transfers in ownership. This permit is not transferable.
Correction of Information Application contains inaccurate or misleading information that must be corrected.
Facility Modifications Any change affecting the nature, volume, or characteristics of the discharge. 
Change in Activity or Pollutant Loading Change in the process generating the discharge or in the pollutant concentration of an existing pollutant.
New Source of Water Introduction of a new water source into the process.
New Pollutant Introduction of a pollutant not previously reported in the initial application.
Change in Flow Increase in the maximum daily discharge flow.
Relocation of Monitoring Point Moving an existing sampling or monitoring location.

Online Noncompliance Reporting

Effective December 1, 2023, DEEP’s Water Permitting and Enforcement Division (“WPED”) receives noncompliance notifications and follow-up reports required under RCSA Section 22a-430 electronically using a web-based platform.

The online noncompliance notification and report forms should be used by facilities with discharge permits issued by WPED to report instances of permit noncompliance including but not limited to effluent limit violations, equipment malfunctions, spills, and bypasses. These forms do not replace DEEP’s 24-hour/day Emergency Response Unit call hotline.

Submit a notification of noncompliance here.

Submit a noncompliance follow-up report here.

Water Pollution Concerns

Report Water Pollution Concerns

Use the above link to report concerns related to water pollution. Submitted complaints are reviewed on an ongoing basis and will be investigated in accordance with the potential environmental harm and risk to public safety. 

If your complaint is an environmental emergency, call DEEP's Emergency Response Unit 24 hours a day at 866-DEP-SPIL (866-337-7745) or 860-424-3338. Please see DEEP's Reporting Environmental Concerns and Problems webpage for additional reporting guidance.

Additional Resources and Contact Information

Compliance Assistance
Industrial Wastewater

Contact Us:

Have a question?  Need help with your permit? We're here to help.

Industrial Water Permitting Program Staff
Connecticut Department of Energy & Environmental Protection (DEEP)
Email: DEEP.IndustrialNPDESCompliance@ct.gov

 

Content last updated March 5, 2026