New Hampshire Alteration of Terrain Stormwater Permits

Under RSA 485-A:17 and Env-Wq 1500, the NH Department of Environmental Services administers Alteration of Terrain permits for projects disturbing 100,000 square feet or more, or 50,000 square feet within a protected shoreland. Applications require erosion and sediment control plans, post-construction stormwater management, and treatment of water quality volumes. Designs must follow the NH Stormwater Manual. Municipalities may have additional local stormwater ordinances, but cannot weaken state AoT standards. The state framework also coordinates with EPA's MS4 program for regulated municipalities.

Violations carry administrative fines up to $2,000 per day, restoration orders, and stop-work orders. Willful violations may incur criminal penalties.