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Revised Assessments for Waters Potentially Impaired for Criteria Expressed Relative to Natural Background for the Group 1 (Cycle 3) Basins


Please Note: Revisions to the Group 1 Lists of Impaired Waters

The criteria for assessing several parameters are dependent on the comparison of values against background or natural background. It is challenging to determine what represents “background” for some of the systems in Florida requiring very site-specific data collections. The parameters that fall into this category are pH, alkalinity, turbidity, and specific conductance. For the determination of impairment, the FDEP performs a preliminary assessment for these parameters according to the following:

Assessment Criteria Implemented for Select Parameters through the IWR database

Parameter Waterbody Class Criteria Assessment
pH Class I & IIIF ph measurement < 6.0 > 8.5 S.U. Potentially Impaired
pH Class II and IIM ph measurement < 6.5 > 8.5 S.U. Potentially Impaired
Alkalinity Class I and IIIF Alkalinity results < 20 mg/L Potentially Impaired
Specific Conductance Class I and IIIF SpCond measurement > 1275 umhos/cm Potentially Impaired
Turbidity Class I, II, IIIF & IIIM Turbidity measurements > 29 N.T.U Potentially Impaired

IIIF - Predominantly fresh waters
IIIM - Predominantly marine waters

The WBIDs in the following table are considered to be impaired based on the preliminary assessment of these parameters.  The Department requests information from stakeholders that may assist in determining the appropriate assessment of these parameters for these waterbodies.  Specifically, information on the presence of pollutant sources and background conditions that could be used for comparison.  Since the above criteria do not fully implement the criteria as stated in 62-302 F.A.C., these WBIDs are placed into category 3c and included on the planning list if the impairment cannot be verified.  This action ensures that the waterbodies are included for strategic monitoring during the next cycle and background conditions can be established.

Note: In an attempt to make commenting on the lists easier, we have designed these lists to provide information regarding the DRAFT assessments and the REVISED assessments. The first two columns in each list indicate whether or not the assessment was on the DRAFT list and/or the REVISED list and the comments provide information on why the assessment may have changed. To determine what is NEW from the draft lists, one can look at those rows where the first column is blank and the second column contains an ‘R’. These represent what is being proposed as the final assessments for the Group 1 basins through the third cycle.

Date Basin Excel Format PDF Format
11/28/12 Everglades West Coast Basin Everglades WC xls Everglades WC pdf
11/28/12 Lake Okeechobee Basin Okeechobee xls Okeechobee pdf
11/28/12 Ocklawaha Basin Ocklawaha xls Ocklawaha-pdf
11/28/12 St Marks - Ochlockonee River Basin St. Marks - Ochlockonee xls St. Marks - Ochlockonee pdf
11/28/12 Suwannee Basin Suwannee xls Suwannee pdf
11/28/12 Tampa Bay Basin Tampa Bay xls Tampa Bay pdf

For more information regarding the Department's rotating basin plan, please visit our "Basin 411" pages.

For more information, send e-mail to Kevin O'Donnell (Kevin.ODonnell@dep.state.fl.us)

Watershed Assessment Program
2600 Blair Stone Road - Mail Station 3560
 Tallahassee, FL, 32399-2400
Phone: (850) 245-8433

Last updated: November 28, 2012

  2600 Blair Stone Road M.S. 3500   Tallahassee, Florida 32399   850-245-8336 (phone) / 850-245-8356 (fax) 
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