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Lake Dora

Dora, Lake

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located within Ocklawaha River Watershed


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

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Overall Trophic State Index

"Trophic" means "relating to nutrition." The Trophic State Index (TSI) takes into account chlorophyll, nitrogen, and phosphorus, which are nutrients required by plant life. The Florida Department of Environmental Protection (FDEP) uses this information to determine a rating for the waterbody. Learn more about the Trophic State Index »

Water Quality Index
Latest Value Limiting Nutrient Historic Range Additional Information
No Data Available No Data Available 12 (Good) - 96 (Poor)
11/6/1979 - 3/11/2014
959 samples
Water Quality Trophic State Index Trophic State Classification
GOOD0 - 59Oligotrophic through Mid-Eutrophic
FAIR60 - 69Mid-Eutrophic through Eutrophic
POOR70 - 100Hypereutrophic
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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) No Data Available 1,730.0 - 20,650.0 ug/L
    1/23/1973 - 3/11/2014
    1,928 samples
    Total Phosphorus (TP) No Data Available -6.3 - 990.0 ug/L
    6/5/1973 - 3/11/2014
    2,172 samples
    Chlorophyll a,
    uncorrected for
    pheophytin help icon
    No Data Available 0.0 - 347.0 ug/L
    11/6/1979 - 3/31/2014
    1,700 samples
    Chlorophyll a,
    corrected for
    pheophytin help icon
    No Data Available 0.0 - 310.4 ug/L
    2/12/1985 - 3/11/2014
    443 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
      Parameter Latest Value Historic Range Additional Information
      Secchi Depth No Data Available 0.1 - 10.5 ft
      6/12/1978 - 3/31/2014
      2,459 samples
      Turbidity No Data Available 5.2 NTU - 76.0 NTU
      2/12/1985 - 3/11/2014
      410 samples
      Light Attenuation No Data Available No Data Available No Data Available
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        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 »

        Parameter Latest Value Historic Range Additional Information
        Fecal Coliform No Data Available 0 - 260 CFU/100ml
        7/30/1974 - 4/3/2012
        13 samples
        Total Coliform No Data Available 0 - 0 CFU/100ml
        7/30/1974 - 7/30/1974
        1 samples
        Enterococcus No Data Available 2 - 2 CFU/100ml
        4/3/2012 - 4/3/2012
        2 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 No Data Available 0.1 - 15.6 mg/l
          6/5/1973 - 3/11/2014
          2,263 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.


            This waterbody is not impaired according to the Impaired Waters Rule (IWR) Chapter 62-303 F.A.C.. Impairment is a status given to waters that are not supporting their designated uses for a particular analyte. 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. Learn more about impaired waters »


            This waterbody has no known pollutants.

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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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