Water Resources of the United States—National Water Information System (NWIS) Mapper

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Water Level and Salinity Analysis Mapper

Salinity Analysis Mapper

Search by State/Territory:

Search by Site Number(s):

Search by Site Name:

Show results within the following:

Real-Time sites

Real-Time water level conditions

Monthly water level conditions

Water salinity

Surface-Water Sites

Instantaneous data

Groundwater Sites

Instantaneous data

Spring sites

Instantaneous data

Atmospheric Sites

Instantaneous data

Salinity tab on main mapper page:

Display list of sites in tabular format

Layers

Water Salinity
Ground water
Surface water

Approximate inland extent of
saltwater intrusion - References

2014

2011

Lines are dashed where information was insufficient for an accurate estimate

Note: If an aquifer is selected from the ‘Filter by source of water’ menu the approximate inland extent of saltwater intrusion will be shown for that aquifer.

South Florida Water Management District Structures

Filter by source of water
Filter applies to water salinity and isochlor layers only. The layers have to be checked in order to be filter.

East coast aquifers
Surficial aquifer system
Includes the Biscayne aquifer
where present
Biscayne aquifer

West coast aquifers
Water-table aquifer
Lower Tamiami aquifer
Mid-Hawthorn aquifer
Sandstone aquifer

Explanation: Water salinity

Symbol colors based on chloride concentration, in mg/L
≥1,000 (salty)
≥250 and <1,000 (brackish)
<250 (fresh)

Symbol shapes based on changes in chloride concentration
Up trend - past 5 years
Down trend - past 5 years
Up trend - past 20 years
Down trend - past 20 years
5- and 20-year trends in opposite directions
No trend
Insufficient data for trend analysis

Symbol Size - Where more than one monitoring site is at the same location the sizes of symbols have been modified so that all can be seen.

Watershed Boundary Dataset
Watershed Boundary Dataset line symbol

USGS National Hydrography
Dataset (NHD)
NHD Home Page

Principal Aquifers
Principal Aquifers Polygons

USGS National Atlas
National Atlas Home Page

USGS Offices
USGS Water Science Center Office

Water Science Center
USGS Water Field Office

Field Office

Export Format:

  Table of Sites (.html)
  List of Site Numbers (.txt)
  Microsoft Excel (.xls)
  Comma Separated (.csv)
  Tab Separated (.rdb)
  Keyhole Markup Language (.kml)
  ESRI ShapeFile (.shp)