2.7.18. McCoy Creek

2.7.18.1. About McCoy Creek

Figure 2.47 The McCoy Creek Tributary (WBID 2257) with sanitary sewer overflows reported by JEA in 2019 (JEA 2019b).
Figure 2.47 The McCoy Creek Tributary (WBID 2257) with sanitary sewer overflows reported by JEA in 2019 (JEA 2019b).

2.7.18.2. Data sources

Data were downloaded from the FL STORET and WIN websites (DEP 2010f; DEP 2018c) and filtered based on the stations (DEP 2010g) in McCoy Creek WBID 2257 (DEP 2014c) shown above. The filtered dataset reflects water column concentrations and was used to generate Table 2.19.

2.7.18.3. Discussion

Water quality data for McCoy Creek are shown in Table 2.19. The fecal coliform level, averaged over all the stations in McCoy Creek, was historically above the WQC of 400 colony-forming-units (CFU) per 100 mL. Thus, a TMDL for fecal coliform was published in 2009 (Rich-Zeisler and Kingon 2009). (Note: the data analysis in the TMDL is based on different criteria than that used in this report). Subsequently, a BMAP for McCoy Creek was legally adopted in 2010 (DEP 2010a). The last Annual Progress Report for this BMAP was published in 2016 and listed 20 active, ongoing projects underway by COJ, FDOT, and JEA and one completed project in 2016 (wet detention pond by COJ) to address the BMAP in the McCoy Creek watershed (DEP 2017c). Measurements from the past three years suggest that fecal coliform levels remain a challenge in McCoy Creek.  Average fecal coliform concentrations remain above the WQC, with a large increase in average fecal coliform levels and number of samples exceeding the WQC in 2019. In 2018, FDEP piloted microbial source tracking strategies in selected impaired waterbodies.  They found that the strategies used could be used to narrow down areas suspected of containing sources that actively contribute fecal indicating bacteria to water in order to identify and remediate them, but this work is resource-intensive.  McCoy Creek was found to have known sources of untreated human waste present (DEP 2019a). Additional information about fecal coliform in the tributaries can be found in Section 2.6 and Table 2.2.

Average dissolved oxygen (DO) levels are above the SSAC of 4.0 mg/L for DO in the mainstem and tributaries (DEP 2014b), and the average DO concentration increased in 2018 following a three-year period of decreases. Average total phosphorus concentrations in 2018 and 2019 were higher than the WQC.

Historical water quality data for these parameters in McCoy Creek are available in previous versions of the River Report.

Table 2.19 Water quality data for McCoy Creek.

 Water QualityAverage and Number of Samples º
ParameterCriteria (FW)201720182019
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0)4.03
(11 of 35 samples)
4.65
(7 of 54 samples)
4.38
(13 of 57 samples)
Total Nitrogen (mg/L)<1.540.67
(0 of 5 samples)
3.23
(1 of 10 samples)
0.86
(1 of 49 samples)
Total Phosphorus (mg/L)<0.120.08
(0 of 2 samples)
0.15
(6 of 14 samples)
0.15
(15 of 25 samples)
Chlorophyll-a (µg/L)<205.55
(0 of 2 samples)
7.05
(1 of 15 samples)
3.53
(0 of 8 samples)
Arsenic (µg/L)≤50Not availableNot available2.50
(0 of 4 samples)
Cadmium (µg/L)≤0.3Not availableNot available0.02
(0 of 4 samples)
Copper (µg/L)≤9.3Not availableNot available1.35
(0 of 4 samples)
Lead (µg/L)≤3.2Not availableNot available0.98
(0 of 4 samples)
Nickel (µg/L)≤52Not availableNot available1.25
(0 of 4 samples)
Silver (µg/L)≤0.07Not availableNot available0.01
(0 of 4 samples)
Zinc (µg/L)≤120Not availableNot available10.0
(0 of 4 samples)
Fecal Coliform (CFU/100 mL)<4001100
(17 of 33 samples)
890
(32 of 52 samples)
2290
(45 of 55 samples)
Turbidity (NTU)<296.67
(0 of 35 samples)
5.22
(0 of 47 samples)
4.65
(0 of 38 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.