2.7.11. Durbin Creek

2.7.11.1. About Durbin Creek

Figure 2.40 The Durbin Creek Tributary (WBID 2365) with sanitary sewer overflows reported by JEA in 2019 (JEA 2019b).
Figure 2.40 The Durbin Creek Tributary (WBID 2365) with sanitary sewer overflows reported by JEA in 2019 (JEA 2019b).
  • East of the St. Johns River South of I-295
  • Primary Land Use: Forested
  • Current TMDL reports: Fecal Coliform, Mercury
  • Not included in 2016 Verified List of Impaired Waters
  • WBID Area: 26.2 sq. mi.
  • Beneficial Use: Class III F

2.7.11.2. Data sources

Result data were downloaded from the FL STORET and WIN websites (DEP 2010f; DEP 2018c) and filtered based on the stations (DEP 2010g) in the Durbin Creek WBID 2365 (DEP 2014c) shown above. The filtered dataset reflects water column concentrations and was used to generate Table 2.12.

2.7.11.3. Discussion

Water quality data for Durbin Creek are shown in Table 2.12. Historically, average dissolved oxygen levels in Durbin Creek were relatively low when compared to other tributaries of the LSJRB. However, no causative pollutant (specific environmental condition) has been identified, and thus no TMDL report is required as it is the “natural condition” of the water body (DEP 2009c). Dissolved oxygen concentrations were above the WQC from 2017 to 2019. A TMDL report is available for fecal coliform in Durbin Creek (Magley 2006a), but fecal coliform levels in Durbin Creek were lower than the WQC in 2018 and 2019. (Note: the data analyses in the TMDL are based on different criteria than that used in this report).  The concentrations of several heavy metals jumped in 2018 and 2019 compared to previous years, although the average concentrations remain lower than the corresponding WQCs.

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

Table 2.13 Water quality data for Durbin Creek.

 Water QualityAverage and Number of Samples º
ParameterCriteria (FW)201720182019
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0)5.93
(0 of 3 samples)
5.57
(0 of 6 samples)
5.24
(0 of 8 samples)
Total Nitrogen (mg/L)<1.54Not availableNot available0.88
(0 of 3 samples)
Total Phosphorus (mg/L)<0.120.06
(0 of 6 samples)
0.11
(1 of 6 samples)
0.06
(0 of 4 samples)
Chlorophyll-a (µg/L)<200.61
(0 of 3 samples)
1.50
(0 of 3 samples)
1.00
(0 of 3 samples)
Arsenic (µg/L)≤500.41
(0 of 3 samples)
1.92
(0 of 3 samples)
1.92
(0 of 3 samples)
Cadmium (µg/L)≤0.30.03
(0 of 3 samples)
0.03
(0 of 3 samples)
0.28
(0 of 2 samples)
Copper (µg/L)≤9.30.27
(0 of 3 samples)
2.75
(0 of 3 samples)
5.25
(1 of 3 samples)
Lead (µg/L)≤3.20.26
(0 of 3 samples)
0.93
(0 of 3 samples)
0.28
(0 of 2 samples)
Nickel (µg/L)≤521.06
(0 of 3 samples)
2.75
(0 of 3 samples)
2.75
(0 of 3 samples)
Silver (µg/L)≤0.070.00
(0 of 3 samples)
0.03
(0 of 3 samples)
0.11
(1 of 3 samples)
Zinc (µg/L)≤1203.82
(0 of 3 samples)
19.17
(0 of 3 samples)
19.17
(0 of 3 samples)
Fecal Coliform (CFU/100 mL)<400Not available72
(0 of 3 samples)
85
(0 of 5 samples)
Turbidity (NTU)<294.98
(0 of 3 samples)
34.91
(1 of 3 samples)
2.38
(0 of 3 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.