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Wetland Indicator Status (WIS) is a designation of the probability that a plant will be found in a wetland area.  We use the designations from USDA PLANTS Database, specifically from the Atlantic and Gulf Coast Plain region.  The description of each designation is listed below:

  • Obligate wetland (OBL) - Almost always occurs in wetlands under natural conditions (estimated probability > 99%).
  • Facultative wetland (FACW) - Usually occurs in wetlands (estimated probability 67% – 99%), but occasionally found in non-wetlands (estimated probability 1% – 33%).
  • Facultative (FAC) - Equally likely to occur in wetlands and non-wetlands (estimated probability 34% – 66%).
  • Facultative upland (FACU) - Usually occurs in non-wetlands (estimated probability 67% – 99%), but occasionally found in wetlands (estimated probability 1% – 33%).
  • Obligate upland (UPL) - Almost always occurs in non-wetlands under natural conditions (estimated probability > 99%).
  • No Indicator (NI) - This plant will not be found in a wetland.
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