Dewatering General Permit (DGP) for Massachusetts & New Hampshire

Alert: The Dewatering General Permit expired on May 20, 2020 and will not be reissued. All dewatering activities must submit an NOI for coverage under the 2022 Dewatering and Remediation General Permit (DRGP).

Existing discharges covered under the DGP that expired on May 20, 2020 that have been administratively continued must reapply no later than 90 days following the DRGP effective date. All DGP permits will automatically be terminated as of March 31, 2023.

2015 Final Dewatering General Permit (DGP)

The Notice of Availability of the Final NPDES General Permit for Dewatering Activity Discharges in Massachusetts (MAG070000) and New Hampshire (NHG070000) was published in the Federal Register on April 20, 2015.

Permit Expiration Date: May 20, 2020

This General Permit replaced the Dewatering General Permit (DGP) that expired on September 30, 2013. The Final General Permit provided coverage for facilities with construction dewatering of groundwater intrusion and/or storm water accumulation from sites less than one acre and short-term and long-term dewatering of foundation sumps into waters of the Commonwealth of Massachusetts and the State of New Hampshire. The Final permit established permit eligibility conditions, notice of intent requirements, effluent limitations, standards, prohibitions, and best management practices. The eligibility requirements for coverage under the general permits are discussed in detail under Part 3 of the draft permit. The reader is strongly urged to go to that section to determine eligibility.

• Federal Register Notice
• Final Dewatering General Permit (pdf) (307 KB)
• Appendix I: Areas of Critical Environmental Concern (ACEC) in Massachusetts (pdf) (437 KB)
• Appendix II: Summary of Marine Essential Fish Habitat Designations (pdf) (194 KB)
• Appendix III: National Historic Preservation Act Review (pdf) (153 KB)
• Appendix IV: Endangered Species Act Guidance and Eligibility Criteria (pdf) (440 KB)
• Appendix V: Notice of Intent (NOI) Instructions and Suggested Formats (pdf) (206 KB)
• Appendix VI: Notice of Termination (NOT) Instructions and Suggested Formats (pdf) (203 KB)
• Appendix VII: Dilution Factor Calculations for Massachusetts and New Hampshire (pdf) (99 KB)
• Appendix VIII: Test Methods and Minimum Levels for Groundwater Sources (pdf) (117 K)
• Appendix IX – Standard Conditions (pdf) (287 KB)
• Fact Sheet (pdf) (332 KB)
• Biological Assessment (pdf) (753 KB)
• Response to Comments (pdf) (324 KB)

Notices of Intent

The table below for a chronological listing of NOIs. Older NOIs are listed in the Dewatering General Permit (DGP) NOI archive.