Rule 62-303.352. Nutrients in Freshwater Lakes

(1) Lakes or lake segments shall be included on the Planning List for nutrients if:

(a) The numeric interpretation of the narrative nutrient criterion established in subsection 62-302.531(2), F.A.C., is exceeded for any parameter;

(b) 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; or

(c) 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; or

(d) There are insufficient data to calculate the long-term geometric mean for color, alkalinity or specific conductance for a lake, the lake shall be included on the Planning List if:

1. the annual geometric mean chlorophyll a value is greater than 6 ug/L in at least one year,

2. the annual geometric mean total nitrogen value is greater than 0.51 mg/L in at least one year, or

3. the annual geometric mean total phosphorus value is greater than 0.01 mg/L in at least one year.

(2) Color, alkalinity, and specific conductance data used to establish the applicable lake criteria are subject to the data sufficiency requirements in sub-subparagraph 62.302.531(2)(b)1.c., F.A.C. Rulemaking Authority 403.061, 403.067 FS. Law Implemented 403.062, 403.067 FS. History–New 6-10-02, Amended 12-11-06, 7-2-12, 2-17-16, 11-25-25.