Rule 62-303.351. Nutrients in Freshwater Streams

A stream or stream segment shall be included on the Planning List for nutrients if:

(1) The applicable numeric interpretation of the narrative nutrient criterion for streams established in subsection 62-302.531(2), F.A.C., is exceeded for any parameter; taking into consideration the floral metrics for the Rapid Periphyton Survey (RPS), Linear Vegetation Survey (LVS), and chlorophyll a, the nutrient thresholds for TN and TP, and SCI results for the stream, consistent with the document titled “Implementation of Florida’s Numeric Nutrient Standards for Streams, June 2025” (incorporated by reference in subsection 62-302.200(36), F.A.C.);

(2) For streams meeting the definition in subsection 62-302.200(36), F.A.C., that do not have a site specific numeric interpretation of the narrative nutrient criterion, the nutrient thresholds in subparagraph 62-302.531(2)(c)2., F.A.C., are exceeded and insufficient Biological Health Assessment data are available to fully assess achievement of the nutrient provisions in subparagraph 62-302.531(2)(c)1., F.A.C., or if there is an annual geometric mean chlorophyll a greater than 3.2 ug/L;

(3) Algal mats or blooms are present in sufficient quantities to pose a nuisance or hinder reproduction of a threatened or endangered species, or other information is available, pursuant to Rule 62-303.350, F.A.C., indicating an imbalance in flora or fauna due to nutrient enrichment;

(4) An annual geometric mean chlorophyll a is greater than 20 ug/l, or

(5) There is a statistically significant increasing trend in the annual geometric means at the 95 percent confidence level in TN, TP or chlorophyll a over the assessment period using the Mann-Kendall Trend Test. To calculate the trend there must be a minimum of four annual geometric means in the assessment period. Rulemaking Authority 403.061, 403.067 FS. Law Implemented 403.062, 403.067 FS. History–New 6-10-02, Repromulgated 1-2-07, 7-2-12, 2-17-16, 11-25-25.