Environmental Data from NHDES

Pursuant to the Groundwater Protection Act section 485-C:5, all groundwater shall be classified for the purpose of prescribing protections and management practices. This layer aptially represents the area(s) listed within RSA, including areas with greater state and local protections. Classifications do not necessarily reflect existing water quality.Reclassification to GA1 requires the entity to develop a Potential Contaminat Source (PCS) management program that regularly provides notice and information concerning best management practices and conducts inspections of PCS facilities.

This is an open data site for NHDES environmental data, maps, and apps.

This layer provides detailed information on the distribution of Peatland habitats, highlighting their specific locations within the landscape. It was developed by extracting data on Peatland Habitat types from the New Hampshire Wildlife Action Plan Habitat Land Cover Map, a comprehensive resource that categorizes various habitat types across the state. By isolating the Peatland Habitat from this map, the layer offers a clear representation of where these unique ecosystems are situated, helping to better understand their spatial extent and contribute to informed conservation and land management decisions. This approach ensures that critical Peatland areas are identified and protected within the broader environmental context.

NH Department of Environmental Services GIS Data

NH Stone Wall Map

The New Hampshire Hydrography Dataset (NHHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the state's surface water drainage system. The NHHD, developed at 1:24,000 scale, is an extract from the high-resolution National Hydrography Dataset (NHD) housed at the US Geological Survey.The NHHD Shapefile Extract contains the NHDFlowline, NHDWaterbody and NHDArea feature classes from the original NHHD geodatabase. These shapefiles cover the extent of the sixteen cataloging units that intersect the State of NH, and contain reach codes for networked features, stream order, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the the Atlantic Ocean. However, because this data is no longer contained in the original geodatabase, the networking capabilities of the NHDFlowline has been lost. This dataset contains data published by USGS in April 2019.

This dataset includes sites that represent a potential threat to drinking water supplies because they may use, handle, or store hazardous substances. The locations of the point features were based on marked up drawings provided by the Water Suppliers. These hardcopy documents were reviewed and their location interpolated from a combination of aerial photography and vector base map data (Department of Transportation (DOT) roadways and town political boundaries). At best, they represent an approximate location of the actual potential contamination source (PCS).The PCS layer may contain data submitted by local entities that may exist in other DES databases (e.g., Aboveground Storage Tanks, Underground Storage Tanks, Contaminated Sites and Areas (SWHI), Hazardous Waste Points and Areas (RCRA), and Auto Salvage (Junkyards)). However, updates of new PCS sites should exclude sites already contained in other DES maintained GIS data layers.

The layer provides point coverage for known solid waste facilities in the State of New Hampshire. Points were identified through a combination of GPS, latitude and longitude, and aerial photography. Some points were taken from other DES-regulated program data co-located at the same facility.

The coverage contains point locations of facilities generating hazardous waste for the State of New Hampshire, regulated under EPA's Resource Conservation and Recovery Act (RCRA) program.

This data set contains digital hydrologic unit boundaries at the subwatershed (12-digit) level. The data set was developed by delineating the boundary lines on base maps or overlays and digitizing the delineated lines. Digital Elevation Model data may have been used in part of the process to establish preliminary boundaries.

This data set consists of geo-referenced digital map data and attribute data. The map data include complete coverage of the entire state including those subwatersheds crossing the borders of adjoining states. The digitized hydrologic units provide area extent of drainage patterns at the appropriate level of detail (basin, subbasin, watershed and subwatershed). Each polygon is linked to a set of attributes, including the hydrologic unit code and information on acreage, type, non-contributing area and trans-basin flow.

This dataset represents all digitized NHDES Wetlands Permit Applications and Notifications, grouped by 5 year increments, which have been applied for and reviewed by the NHDES Wetlands Bureau under RSA 482-A and NH Administrative Rules Chapter Env-Wt 100 - 900. Projects that have received approval through the Wetlands Permitting Process must still meet all other applicable local, state and federal regulations.Additional information related to any point feature may be found at NHDES' LRM OneStop. Projects that have received approval through the Wetlands Permitting Process must still meet all other applicable local, state and federal regulations.

The NH Department of Environmental Services (NHDES) has developed geographic information on the boundaries of shellfish growing areas in NH's tidal waters. Under the authority granted by RSA 143:21, RSA 143:21-a and RSA 487:34, NHDES uses a set of guidelines and standards known as the National Shellfish Sanitation Program (NSSP) for classifying shellfish growing areas.

This dataset shows shellfish suitability areas (habitats) for eleven shellfish species (Atlantic surf clam, ocean quahog, quahog, razor clam, soft-shell clam, blue mussel, American oyster, Eastern Oyster, European oyster, bay scallop, and the sea scallop) for New Hampshire, Maine, and Massachusetts.

The NH Department of Environmental Services (NHDES) has compiled geographic information on the boundaries of aquaculture sites in NH's tidal waters. The coverage contains the boundaries of aquaculture sites that were licensed in 2015. Information is current as of 5/13/2015.

Environmental Data from NHDES

This dataset is the result of a multi-year effort led by the NHDES Coastal Program to compile and categorize coastal habitat restoation projects in the state of New Hampshire over the period from 1990 to present day. Generally, all of the coastal restoration projects within this dataset share the following qualities: 1) Located in the New Hampshire Coastal Zone communities; 2) Pro-actively restored jurisdictional coastal habitat; and 3) Received a dredge and fill permit from the NHDES Wetlands Bureau. Project types include oyster, eelgrass, living shoreline, salt marsh, dune, and river restoration.