The following maps document where conditions are likely to contribute to excess nitrogen loading. These indicators include degraded water quality, shallow depth to ground water, flood and SLOSH zones, soil conditions, lot size, and the time it takes groundwater to reach surface waters. We then assigned points to prioritize locations needing nitrate mitigation. The maps depicting priority areas with flags highlighting small lots in medium and high priority zones indicate locations where community systems might be a viable alternative to single, onsite enhancements. The maps are provided, both town-wide and by hamlet. The hamlet maps are ordered East to West for the North Fork, and West to East for the South Fork. The maps were developed by Peconic Green Growth and the GIS Department of the Town of Southampton with funding from the LI Sound Futures Fund, Long Island Community Foundation, Suffolk County through the Water Quality Protection and Restoration Program, and Patagonia, Inc.
The Town of Southold has created an interactive map on water quality that will be constantly updated. It can be viewed here. The NYSDEC updates on waters closed to shellfishing can be found here.
East Hampton
- East Hampton Town Water Quality
- East Hampton Town Groundwater Depth
- East Hampton Town Flood
- East Hampton Town Sea Level Rise By 2050
- East Hampton Town Sea Level Rise By 2080
- East Hampton Town Soils: Drainage
- East Hampton Town Soils: Septic
- East Hampton Town Acreage
- East Hampton Town Parcels Less 20000
- East Hampton Town Influence
- East Hampton Town Priorities
- East Hampton Town Priorities W Flags
- East Hampton Town Land Use
- East Hampton Town Sewer
- East Hampton Town Imagery
- East Hampton Town 200′ Buffer Zones to Buildings
Sag Harbor
- Sag Harbor Water Quality
- Sag Harbor Groundwater Depth
- Sag Harbor Flood
- Sag Harbor Soils: Drainage
- Sag Harbor Soils: Septic
- Sag Harbor Acreage
- Sag Harbor Influence
- Sag Harbor Land Use
- Sag Harbor Priorities
- Sag Harbor Imagery
- Sag Harbor 200′ Building Buffer Zone
Northwest Harbor
- Northwest Harbor Water Quality
- Northwest Harbor Groundwater Depth
- Northwest Harbor Flood
- Northwest Harbor Soils: Drainage
- Northwest Harbor Soils: Septic
- Northwest Harbor Acreage
- Northwest Harbor Water Quality
- Northwest Harbor Influence
- Northwest Harbor Priorities
- Northwest Harbor Land Use
- Northwest Harbor Imagery
Springs
- Springs Water Quality
- Springs Groundwater Depth
- Springs Flood
- Springs Soils: Drainage
- Springs Soils: Septic
- Springs Acreage
- Springs Influence
- Springs Priorities
- Springs Land Use
- Springs Imagery
- Springs 200′ Buffer Zones to Buildings
Amagansett
- Amagansett Water Quality
- Amagansett Groundwater Depth
- Amagansett Flood
- Amagansett Soils: Drainage
- Amagansett Soils: Septic
- Amagansett Acreage
- Amagansett Influence
- Amagansett Priorities
- Amagansett Land Use
- Amagansett Imagery
Napeague
- Napeague Water Quality
- Napeague Groundwater Depth
- Napeague Flood
- Napeague Soils: Drainage
- Napeague Soils: Septic
- Napeague Acreage
- Napeague Influence
- Napeague Priorities
- Napeague Land Use
- Napeague Imagery
Montauk
- Montauk Water Quality
- Montauk Groundwater Depth
- Montauk Flood
- Montauk Soils: Drainage
- Montauk Soils: Septic
- Montauk Acreage
- Montauk Influence
- Montauk Priorities
- Montauk Land Use
- Montauk Imagery
- Montauk 200′ Buffer Zones to Buildings
Riverhead
- Town Of Riverhead Water Quality
- Town Of Riverhead Groundwater Depth
- Town Of Riverhead Flood
- Town Of Riverhead Sea Level Rise By 2050
- Town Of Riverhead Sea Level Rise By 2080
- Town Of Riverhead Soils: Drainage
- Town Of Riverhead Soils: Septic
- Town Of Riverhead Acreage
- Town Of Riverhead Parcels Less 20000
- Town Of Riverhead Influence
- Town Of Riverhead Priorities
- Town Of Riverhead Priorities W Flags
- Town Of Riverhead Land Use
- Town Of Riverhead Imagery
- Town Of Riverhead Sewer
Northville
- Northville Riverhead East Water Quality
- Northville Riverhead East Groundwater Depth
- Northville Riverhead East Flood
- Northville Riverhead East Soils: Drainage
- Northville Riverhead East Soils: Septic
- Northville Riverhead East Acreage
- Northville Riverhead East Influence
- Northville Riverhead East Priorities
- Northville Riverhead East Land Use
- Northville Riverhead East Imagery
Aquebogue
- Aquebogue Water Quality
- Aquebogue Groundwater Depth
- Aquebogue Flood
- Aquebogue Soils: Drainage
- Aquebogue Soils: Septic
- Aquebogue Acreage
- Aquebogue Influence
- Aquebogue Priorities
- Aquebogue Land Use
- Aquebogue Imagery
- Aquebogue 200′ Buffer Zones to Buildings
Riverhead/Riverhead West
- Riverhead West Water Quality
- Riverhead West Groundwater Depth
- Riverhead West Flood
- Riverhead West Soils: Drainage
- Riverhead West Soils: Septic
- Riverhead West Acreage
- Riverhead West Influence
- Riverhead West Priorities
- Riverhead West Land Use
- Riverhead West Imagery
Calverton
- Calverton Water Quality
- Calverton Groundwater Depth
- Calverton Flood
- Calverton Soils: Drainage
- Calverton Soils: Septic
- Calverton Acreage
- Calverton Influence
- Calverton Priorities
- Calverton Land Use
- Calverton Imagery
Wading River
- Wading River Water Quality
- Wading River Groundwater Depth
- Wading River Flood
- Wading River Soils: Drainage
- Wading River Soils: Septic
- Wading River Acreage
- Wading River Influence
- Wading River Priorities
- Wading River Land Use
Laurel
- Laurel Water Quality
- Laurel Groundwater Depth
- Laurel Flood
- Laurel Soils: Drainage
- Laurel Soils: Septic
- Laurel Acreage
- Laurel Influence
- Laurel Land Use
- Laurel Imagery
Jamesport
- Jamesport Water Quality
- Jamesport Groundwater Depth
- Jamesport Flood
- Jamesport Soils: Drainage
- Jamesport Soils: Septic
- Jamesport Acreage
- Jamesport Influence
- Jamesport Land Use
- Jamesport Priorities
South Jamesport
- South Jamesport Water Quality
- South Jamesport Groundwater Depth
- South Jamesport Flood
- South Jamesport Soils: Drainage
- South Jamesport Soils: Septic
- South Jamesport Acreage
- South Jamesport Influence
- South Jamesport Priorities
- South Jamesport 200′ Building Buffer Zone
Manorville
- Manorville Water Quality
- Manorville Groundwater Depth
- Manorville Flood
- Manorville Drainage
- Manorville Soils Septic
- Manorville Acreage
- Manorville Parcels Less 20000
- Manorville Influence
- Manorville Priorities
- Manorville Land Use
- Manorville Imagery
Shelter Island
- Shelter Island Town Water Quality
- Shelter Island Town Groundwater Depth
- Shelter Island Town Flood
- Shelter Island Town Sea Level Rise By 2050
- Shelter Island Town Sea Level Rise By 2080
- Shelter Island Town Soils: Drainage
- Shelter Island Town Soils: Septic
- Shelter Island Town Acreage
- Shelter Island Town Parcels Less 20000
- Shelter Island Town Influence
- Shelter Island Town Priorities
- Shelter Island Town Priorities W Flags
- Shelter Island Town Sewer
- Shelter Island Town Land Use
- Shelter Island Town Imagery
Shelter Island Heights
- Shelter Island Heights Water Quality
- Shelter Island Heights Groundwater Depth
- Shelter Island Heights Flood
- Shelter Island Heights Soils: Drainage
- Shelter Island Heights Soils: Septic
- Shelter Island Heights Acreage
- Shelter Island Heights Influence
- Shelter Island Heights Priorities
- Shelter Island Heights Sewer
- Shelter Island Heights Land Use
- Shelter Island Heights Imagery
Dering Harbor
- Dering Harbor Water Quality
- Dering Harbor Groundwater Depth
- Dering Harbor Flood
- Dering Harbor Soils: Drainage
- Dering Harbor Soils: Septic
- Dering Harbor Acreage
- Dering Harbor Influence
- Dering Harbor Priorities
- Dering Harbor Land Use
- Dering Harbor Imagery
Shelter Island
- Shelter Island Water Quality
- Shelter Island Groundwater Depth
- Shelter Island Flood
- Shelter Island Soils: Drainage
- Shelter Island Soils: Septic
- Shelter Island Acreage
- Shelter Island Influence
- Shelter Island Priorities
- Shelter Island Land Use
- Shelter Island Imagery
Southampton
- Southampton Town Water Quality
- Southampton Town Groundwater Depth
- Southampton Town Flood
- Southampton Town Sea Level Rise By 2050
- Southampton Town Sea Level Rise By 2080
- Southampton Town Soils: Drainage
- Southampton Town Soils: Septic
- Southampton Town Acreage
- Southampton Town Parcels Less 20000
- Southampton Town Influence
- Southampton Town Priorities
- Southampton Town Priorities W Flags
- Southampton Town Sewer
- Southampton Town Land Use
- Southampton Town Imagery
Riverside
- Riverside Water Quality
- Riverside Groundwater Depth
- Riverside Flood
- Riverside Soils: Drainage
- Riverside Soils: Septic
- Riverside Acreage
- Riverside Influence
- Riverside Priorities
- Riverside Land Use
- Riverside Imagery
Flanders
- Flanders Water Quality
- Flanders Groundwater Depth
- Flanders Flood
- Flanders Soils: Drainage
- Flanders Soils: Septic
- Flanders Acreage
- Flanders Influence
- Flanders Priorities
- Flanders Priorities Closer
- Flanders Land Use
- Flanders Imagery
Hampton Bays
- Hampton Bays Water Quality
- Hampton Bays Groundwater Depth
- Hampton Bays Flood
- Hampton Bays Soils: Drainage
- Hampton Bays Soils: Septic
- Hampton Bays Acreage
- Hampton Bays Influence
- Hampton Bays Priorities
- Hampton Bays Land Use
- Hampton Bays Imagery
Shinnecock Hills
- Shinnecock Hills Water Quality
- Shinnecock Hills Groundwater Depth
- Shinnecock Hills Flood
- Shinnecock Hills Soils: Drainage
- Shinnecock Hills Soils: Septic
- Shinnecock Hills Acreage
- Shinnecock Hills Influence
- Shinnecock Hills Priorities
- Shinnecock Hills Land Use
- Shinnecock Hills Imagery
Tuckahoe
- Tuckahoe Water Quality
- Tuckahoe Groundwater Depth
- Tuckahoe Flood
- Tuckahoe Soils: Drainage
- Tuckahoe Soils: Septic
- Tuckahoe Acreage
- Tuckahoe Influence
- Tuckahoe Priorities
- Tuckahoe Land Use
- Tuckahoe Imagery
North Sea
- North Sea Water Quality
- North Sea Groundwater Depth
- North Sea Flood
- North Sea Soils: Drainage
- North Sea Soils: Septic
- North Sea Acreage
- North Sea Influence
- North Sea Priorities
- North Sea Land Use
- North Sea Imagery
- North Sea 200′ Building Buffer Zone
Noyac
- Noyac Water Quality
- Noyac Groundwater Depth
- Noyac Flood
- Noyac Soils: Drainage
- Noyac Soils: Septic
- Noyac Acreage
- Noyac Influence
- Noyac Priorities
- Noyac Land Use
- Noyac Imagery
North Haven
- North Haven Water Quality
- North Haven Groundwater Depth
- North Haven Flood
- North Haven Soils: Drainage
- North Haven Soils: Septic
- North Haven Acreage
- North Haven Influence
- North Haven Priorities
- North Haven Land Use
- North Haven Imagery
- North Haven 200′ Building Buffer Zone
Sag Harbor
- Sag Harbor Water Quality
- Sag Harbor Groundwater Depth
- Sag Harbor Flood
- Sag Harbor Soils: Drainage
- Sag Harbor Soils: Septic
- Sag Harbor Acreage
- Sag Harbor Influence
- Sag Harbor Priorities
- Sag Harbor Priorities W Sewer Flags
- Sag Harbor Land Use
- Sag Harbor 200 Bldg Buff
- Sag Harbor Imagery
- Sag Harbor 200′ Building Buffer Zone
Southold
- Town Of Southold Water Quality
- Town Of Southold Groundwater Depth
- Town Of Southold Flood
- Town Of Southold Sea Level Rise By 2050
- Town Of Southold Sea Level Rise By 2080
- Town Of Southold Soils: Drainage
- Town Of Southold Soils: Septic
- Town Of Southold Acreage
- Town Of Southold Parcels Less 20000
- Town Of Southold Influence
- Town Of Southold Priorities
- Town Of Southold Priorities W Flags
- Town Of Southold Land Use
- Town Of Southold Imagery
- Town Of Southold Sewer
Fishers Island
- Fishers Island Groundwater Depth
- Fishers Island Flood
- Fishers Island Soils: Drainage
- Fishers Island Soils: Septic
- Fishers Island Acreage
- Fishers Island Influence
- Fishers Island Priorities
- Fishers Island Land Use
- Fishers Island Imagery
Orient
- Orient Groundwater Depth
- Orient Flood
- Orient Sea Level Rise By 2050
- Orient Sea Level Rise By 2080
- Orient Soils: Drainage
- Orient Soils: Septic
- Orient Acreage
- Orient Parcels Less 20000
- Orient Influence
- Orient Priorities
- Orient Land Use
- Orient 200 Bldg Buff
- Orient Imagery
East Marion
- East Marion Groundwater Depth
- East Marion Flood
- East Marion Soils: Drainage
- East Marion Soils: Septic
- East Marion Acreage
- East Marion Influence
- East Marion Priorities
- East Marion Land Use
- East Marion Districts
- East Marion Imagery
Greenport Hamlet
- Greenport Groundwater Depth
- Greenport Flood
- Greenport Soils: Drainage
- Greenport Soils: Septic
- Greenport Acreage
- Greenport Influence
- Greenport Priorities
- Greenport Land Use
- Greenport Imagery
- Greenport Sewer
Southold
- Southold Groundwater Depth
- Southold Flood
- Southold Soils: Drainage
- Southold Soils: Septic
- Southold Acreage
- Southold Influence
- Southold Priorities
- Southold Priorities W Flags Key
- Southold Land Use
- Southold Imagery
Peconic
- Peconic Groundwater Depth
- Peconic Flood
- Peconic Soils: Drainage
- Peconic Soils: Drainage
- Peconic Acreage
- Peconic Influence
- Peconic Priorities
- Peconic Land Use
- Peconic Imagery
Cutchogue
- Cutchogue Groundwater Depth
- Cutchogue Flood
- Cutchogue Soils: Drainage
- Cutchogue Soils: Septic
- Cutchogue Acreage
- Cutchogue Influence
- Cutchogue Land Use
- Cutchogue Priorities
- Cutchogue Imagery
Mattituck
- Mattituck Groundwater Depth
- Mattituck Flood
- Mattituck Soils: Drainage
- Mattituck Soils: Septic
- Mattituck Acreage
- Mattituck Influence
- Mattituck Priorities
- Mattituck Land Use
- Mattituck 200 Bldg Buff
- Mattituck Imagery
New Suffolk
- New Suffolk Groundwater Depth
- New Suffolk Flood
- New Suffolk Soils: Drainage
- New Suffolk Soils: Septic
- New Suffolk Acreage
- New Suffolk Influence
- New Suffolk Priorities
- New Suffolk Land Use
- New Suffolk Imagery
Laurel
- Laurel Groundwater Depth
- Laurel Flood
- Laurel Soils: Drainage
- Laurel Soils: Septic
- Laurel Acreage
- Laurel Influence
- Laurel Land Use
- Laurel Imagery