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Salinity: PSS (Practical Salinity Scale) displayed in ppt

  • Salinity is the measure of dissolved salts in the water expressed in ppt. (parts per thousand).
  • Seawater is between 30-35 ppt.
  • Brackish water zones in the Bay range between 1-5 ppt.
  • Typically, the salinity will be low in the spring with more rainfall occurring, and higher in late summer/fall when it is dryer.
  • County tidal rivers typically fall into the brackish water zone of the Chesapeake Bay throughout the year with salinity readings ranging between 0-5 ppt.
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