Category Archives: Council District 13

District Information

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2.7.16. Intracoastal Waterway

2.7.16.1. About the Intracoastal Waterway

Figure 2.48
Figure 2.49 The Intracoastal Waterway Tributary (WBID 2205C).
  • Near the mouth of the St. Johns River
  • Primary Land Use: Marsh/Wetland (Land Cover)
  • Current TMDL reports: Mercury
  • Verified Impaired 2016 (final): Fecal Coliform (low), Iron (med)
  • WBID Area: 23.9 sq. mi.
  • Beneficial Use: Class III M (Recreational – Marine)

2.7.16.2. Data sources

Result data were downloaded from the FL STORET and WIN websites (DEP 2010f; DEP 2018h) and filtered based on the stations (DEP 2010g) in the Intracoastal Waterway (ICW) WBID 2205C (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.17.

2.7.16.3. Discussion

Result data were downloaded from the FL STORET and WIN websites (DEP 2010f; DEP 2018h) and filtered based on the stations (DEP 2010g) in the Intracoastal Waterway (ICW) WBID 2205C (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.17.

Table 2.17 Water quality data for the Intracoastal Waterway.

 Water QualityAverage and Number of Samples º
ParameterCriteria (SW)201620172018
Dissolved Oxygen (mg/L)≥4.06.36
(0 of 6 samples)
5.66
(1 of 14 samples)
6.20
(0 of 24 samples)
Total Nitrogen (mg/L)<1.540.50
(0 of 3 samples)
Not availableNot available
Total Phosphorus (mg/L)<5.42.59
(0 of 3 samples)
4.20
(2 of 9 samples)
0.10
(1 of 22 samples)
Chlorophyll-a (µg/L)<112.59
(0 of 3 samples)
4.20
(0 of 9 samples)
4.57
(5 of 11 samples)
Arsenic (µg/L)≤5018.19
(0 of 6 samples)
10.99
(0 of 10 samples)
6.36
(0 of 22 samples)
Cadmium (µg/L)≤8.80.09
(0 of 6 samples)
0.18
(0 of 10 samples)
0.50
(0 of 22 samples)
Copper (µg/L)≤3.71.19
(0 of 6 samples)
1.36
(0 of 10 samples)
4.36
(17 of 22 samples)
Lead (µg/L)≤8.50.14
(0 of 6 samples)
0.11
(0 of 10 samples)
0.50
(0 of 22 samples)
Nickel (µg/L)≤8.30.54
(0 of 6 samples)
0.58
(0 of 10 samples)
1.00
(0 of 22 samples)
Silver (µg/L)≤0.92*0.03
(0 of 6 samples)
0.01
(0 of 10 samples)
0.50
(0 of 22 samples)
Zinc (µg/L)≤862.70
(0 of 6 samples)
3.02
(0 of 10 samples)
5.00
(0 of 22 samples)
Fecal Coliform (CFU/100 mL)<400Not availableNot available1100
(1 of 1 sample)
Turbidity (NTU)<293.96
(0 of 3 samples)
6.98
(0 of 9 samples)
6.13
(0 of 10 samples)
Note: Hardness-dependent freshwater criteria for cadmium, copper, lead, nickel, and zinc were generated based on a hardness concentration of 100 mg/L.
° = Number of samples below Water Quality Criteria for Dissolved Oxygen; Number of samples above Water Quality Criteria for all other parameters.
FW = freshwater; SW = saltwater (marine). Values denoted with (*) indicate a proposed criterion, which has not yet been adopted.
Values denoted with (‡) are reference values based on EPA criteria (EPA 2010b), but the water body is not regulated by this standard.