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St. Johns River

St. Johns River

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located within St. Johns River Watershed

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Description

Explore general as well as scientific information about the movement, chemistry and biology of area surface water environments.

The data on this page are designed to give you a picture of the total health of this waterbody. Click the "Learn More" text to learn more about each parameter shown and how it indicates Water Quality.

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Water Quality Index

Water Quality Index (WQI) is an average of 5 different parameters giving a river a good (0-45), fair (45-60), or poor (60+) rating. Learn more about the Water Quality Index »

 
Water Quality Index

Whole River Range

21 - 68
Good - Poor
Jan-Mar 2014

Data by River Segment



 
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Nutrient Chemistry

Although present in all surface waters, nutrients are among the leading causes of degradation of Florida water resources. Learn more about nutrient chemistry »

Nutrient Chemistry
Parameter Latest Value Historic Range Additional Information
Total Nitrogen (TN) 1,650.7 ug/l
5/19/2014 11:40:00 AM
Source: SJRWMD Water Quality Data
4.0 - 18,000.0 ug/L
2/5/1968 - 5/19/2014
6,118 samples
Total Phosphorus (TP) 120.0 ug/L
5/19/2014 11:40:00 AM
Source: SJRWMD Water Quality Data
0.0 - 11,600.0 ug/L
2/17/1966 - 5/19/2014
10,092 samples
Chlorophyll a,
uncorrected for
pheophytin help icon
62.0 ug/L
5/19/2014 11:40:00 AM
Source: SJRWMD Water Quality Data
0.0 - 72,980.0 ug/L
1/12/1970 - 5/19/2014
3,553 samples
Chlorophyll a,
corrected for
pheophytin help icon
56.6 ug/L
5/19/2014 11:40:00 AM
Source: SJRWMD Water Quality Data
0.0 - 399.6 ug/L
1/26/1981 - 5/19/2014
4,168 samples
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    Water Clarity

    Water clarity or turbidity measures the degree to which light is blocked because the water is cloudy or contains suspended particles, such as algae. Water clarity is one indicator of a waterbody's ability to sustain plants and wildlife. Learn more about water clarity »

     
    Water Clarity

    Whole River Range

    As of 10/29/2007,
    down Average turbidity is lower than it has been historically.

    Data by River Segment


     
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      Bacteria

      The currently used bacterial indicators for recreational waters include total coliform, fecal coliform and enterococcus. Indicator organisms themselves are not necessarily pathogenic but their presence "indicates" or suggests recent contamination by human sewage or other waste which may result in human illness. Sources of contamination include storm water runoff, sewage overflows and feces from wild and domestic animals. Learn more about bacteria »

      Bacteria
      Parameter Latest Value Historic Range Additional Information
      Fecal Coliform 21 CFU/100ml
      4/3/2014 10:20:00 AM
      Source: SJRWMD Water Quality Data
      0 - 3,985 CFU/100ml
      11/6/1973 - 4/3/2014
      2,994 samples
      Total Coliform 200 CFU/100ml
      3/26/2007
      Source: Orange County Surface Water Quality
      0 - 300,000 CFU/100ml
      10/4/1968 - 3/26/2007
      1,634 samples
      Enterococcus 18 CFU/100ml
      4/3/2014 10:20:00 AM
      Source: SJRWMD Water Quality Data
      1 - 5,800 CFU/100ml
      1/25/1999 - 4/3/2014
      1,549 samples
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        Dissolved Oxygen

        Dissolved Oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms. Learn more about dissolved oxygen »

        Additional Parameters
        Parameter Latest Value Historic Range Additional Information
        Dissolved Oxygen 9.8 mg/l
        5/19/2014 11:42:00 AM
        Source: SJRWMD Water Quality Data
        0.0 - 45.9 mg/l
        5/10/1967 - 9/1/2014
        500,829 samples
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          Salinity

          Salinity
          Salinity measures the amount of salts dissolved in water. An estuary can exhibit a change in salinity throughout its length as fresh water entering from the tributaries mixes with seawater from the ocean. Learn more about salinity »
          Parameter Latest Value Historic Range Additional Information
          Salinity 0.7 ppt
          5/19/2014 11:42:00 AM
          Source: SJRWMD Water Quality Data
          0.0 - 36.0 ppt
          3/21/1991 - 5/19/2014
          3,587 samples
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          Impaired Waters

          The Impaired Waters Data is the most recent available data from FDEP, but it may not reflect the current FDEP impaired list. These data are updated when and as soon as they are made available from FDEP.

          Impaired

          This waterbody is impaired according to the State of Florida's Impaired Waters Rule (IWR) Chapter 62-303 F.A.C. that governs the Total Maximum Daily Loads (TMDL) Program or according to the U.S. Environmental Protection Agency (EPA). Identification of Impaired Surface Waters (IWR) is a new scientific approach for guiding Florida Department of Environmental Protection process for identifying and prioritizing impaired surface waters in Florida. The rule evaluates whether waters meet their designated uses for a particular analyte, which include aquatic life use support, primary contact and recreation use support, fish and shellfish consumption use support, and drinking water use support. All water resources in this county are designated as Class III waters. Class III waters are considered recreational use waters, which means that the water should be fishable and swimmable. Class II waters are for shellfish propagation and harvesting. Class I waters are considered potable (drinkable) water supplies. As part of the terms of a court order related to the 1998 303(d) list of impaired waters, some waters are listed as impaired by EPA but not listed by the State of Florida. Learn more about impaired waters »

          Pollutants

          This waterbody has been associated with the following WBIDs deemed impaired by the Florida Department of Environmental Protection:

          WBID Basin Impairment(s)
          28935 ST JOHNS RIVER ABOVE PUZZLE LAKE (SOUTH SEGMENT) DISSOLVED OXYGEN, FECAL COLIFORM, MERCURY (IN FISH TISSUE)
          2893A1 ST JOHNS RIVER BELOW LAKE GEORGE MERCURY (IN FISH TISSUE), NUTRIENTS (CHLOROPHYLL-A)
          2893A2 ST JOHNS RIVER ABOVE LAKE GEORGE DISSOLVED OXYGEN, MERCURY (IN FISH TISSUE), NUTRIENTS (CHLOROPHYLL-A)
          2893B ST JOHNS RIVER ABOVE LAKE WOODRUFF DISSOLVED OXYGEN, MERCURY (IN FISH TISSUE)
          2893C ST JOHNS RIVER ABOVE WEKIVA RIVER DISSOLVED OXYGEN, MERCURY (IN FISH TISSUE), NUTRIENTS (CHLOROPHYLL-A)
          2893E ST JOHNS RIVER ABOVE LAKE MONROE DISSOLVED OXYGEN, MERCURY (IN FISH TISSUE), NUTRIENTS (CHLOROPHYLL-A)
          2893F ST JOHNS RIVER ABOVE LAKE JESUP DISSOLVED OXYGEN, MERCURY (IN FISH TISSUE), NUTRIENTS (CHLOROPHYLL-A AND HISTORIC CHLOROPHYLL-A)
          2893I ST JOHNS RIVER ABOVE PUZZLE LAKE DISSOLVED OXYGEN (NUTRIENTS), MERCURY (IN FISH TISSUE), NUTRIENTS (HISTORIC CHLOROPHYLL-A), SILVER
          2893Z ST JOHNS RIVER BELOW LAKE DEXTER MERCURY (IN FISH TISSUE)
          2964 ST JOHNS RIVER ABOVE LAKE HARNEY (UNDERHILL SLOUGH) DISSOLVED OXYGEN, MERCURY (IN FISH TISSUE)

          Source(s): Florida Department of Environmental Protection


          This waterbody has been associated with the following WBIDs deemed impaired by the Environmental Protection Agency's 303(d) list:

          WBID Basin Impairment(s) EPA Details
          28935 ST JOHNS RIVER ABOVE PUZZLE LAKE (SOUTH SEGMENT) DISSOLVED OXYGEN, FECAL COLIFORM, MERCURY IN FISH TISSUE View additional EPA information »
          2893A1 ST JOHNS RIVER BELOW LAKE GEORGE CHLOROPHYLL-A, MERCURY IN FISH TISSUE View additional EPA information »
          2893A2 ST JOHNS RIVER ABOVE LAKE GEORGE CHLOROPHYLL-A, DISSOLVED OXYGEN, MERCURY IN FISH TISSUE View additional EPA information »
          2893B ST JOHNS RIVER ABOVE LAKE WOODRUFF BENTHIC MACROINVERTEBRATES BIOASSESSMENTS, DISSOLVED OXYGEN, MERCURY IN FISH TISSUE View additional EPA information »
          2893C ST JOHNS RIVER ABOVE WEKIVA RIVER BIOCHEMICAL OXYGEN DEMAND (BOD), CHLOROPHYLL-A, MERCURY IN FISH TISSUE View additional EPA information »
          2893E ST JOHNS RIVER ABOVE LAKE MONROE CHLOROPHYLL-A, DISSOLVED OXYGEN, MERCURY IN FISH TISSUE View additional EPA information »
          2893F ST JOHNS RIVER ABOVE LAKE JESUP DISSOLVED OXYGEN, MERCURY IN FISH TISSUE View additional EPA information »
          2893I ST JOHNS RIVER ABOVE PUZZLE LAKE CHLOROPHYLL-A, DISSOLVED OXYGEN, MERCURY IN FISH TISSUE, SILVER View additional EPA information »
          2893Z ST JOHNS RIVER BELOW LAKE DEXTER DISSOLVED OXYGEN, MERCURY IN FISH TISSUE View additional EPA information »
          2964 ST JOHNS RIVER ABOVE LAKE HARNEY (UNDERHILL SLOUGH) DISSOLVED OXYGEN, MERCURY IN FISH TISSUE View additional EPA information »

          Source(s): US Environmental Protection Agency

           
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          Advanced Data Features

          Files Graphs

          Data Download and Advanced Graphing Tool
          Download and/or graph water quality, hydrology, and rainfall trends using the data presented on the Atlas for use in your own analyses and reports.

           
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