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The N.H. Department of Enviromental Services' Subsurface Systems Bureau administers the laws, regulations and rules affecting septic systems within New Hampshire.  They are located at 29 Hazen Drive, P.O. Box 95, Concord, NH  03302-0095. They can be contacted at 603-271-3501 or by clicking here to send them an email.

New! Click here for the latest version of the bureau's regional inspector map (as of 12/2018)

Click here for a link to the application form for conducting historical research for older septic system records.

In response to H.B. 1415,  which is now law and takes effect immediately, NHDES has created an "Application for Repair or Replacement in Kind of an Individual Sewage Disposal System" and Checklist for use by designers and installers.  Click here to download the application and checklist.  Please note that the checklist should not be sent in with the application, but should be kept for your reference.

Changes to the Land Resources Management permit application policy now in effect.

NHDES Subsurface Systems Bureau Web Site

Chapter Env-Wq 1000 Subdivision and Individual Sewage Disposal System Design Rules
Rules in effect as of April 16, 2011. 

DES One-Stop Application & Approval Status

On-Site Wastewater Disposal System Installation Manual

List of Towns Requiring Approval of Septic Plans

Disposal of Backwash from Water Treatment Devices at Single Family and Duplex Residences Adobe Acrobat Reader Symbol 

Click here for: DES List of Fourth Order and Higher Streams for Purposes of Conducting Site Assessments of Developed Waterfront Property

Click here for the updated Site Assessment Fact Sheet.

2013 DRAFT N.H. Nonpoint Source Management Plan

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NHDES Subsurface Systems Bureau : Granite State Designers and Installers