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The main headquarters for NHDES is at 29 Hazen Drive in Concord, NH, 03301; (603) 271-3503. However, NHDES also maintains several regional offices to accommodate the public's need for various services, and it operates a regional wastewater treatment facility and training center based in Franklin administered by the Winnipesaukee River Basin Program. 

NHDES maintains a regional office at Pease International Tradeport in Portsmouth that addresses the areas of septic systems, wetlands, coastal watershed management, waste management and erosion control. NHDES also has small regional offices serving septic system needs administered by the Subsurface Systems Bureau, with one such office (in Grantham) that also serves regional waste management needs. The locations for all of these regional offices are as follows:

NHDES Portsmouth Regional Office
Pease International Tradeport 
222 International Drive, Suite 175
Portsmouth, NH 03801 
(603) 559-1500 
Map

NHDES Gorham Regional Office
80 Glen Road
Gorham, NH 03581
(603) 466-5379
Map

Hotlines

Spill Reporting Hotline:
(603) 271-7384

(603) 223-4381, after hours

Hazardous Waste Compliance:
1-866-HAZWAST

Ozone: 1-800-935-SMOG

Used Oil Recycling:
1-888-TAKEOIL