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New Hampshire Department of Environmental Services

Storm Water Regulations

When reviewing subdivisions and site plans, a major water-related concern is storm water management. While projects that alter 100,000 square feet or more (50,000 square feet or more of protected shoreland) require a permit from NHDES’s Alteration of Terrain (Site Specific) bureau, municipalities may set more stringent standards, and should also regulate projects that fall below the Site Specific threshold. While local regulation of storm water management has long been concerned with preventing erosion and sedimentation of waterways, there has been growing concern about infiltrating storm water into the ground in order to recharge groundwater. For more information, see Managing Stormwater as a Valuable Resource Adobe Acrobat Reader Symbol.



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NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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