2.7.25. Ribault River

2.7.25.1. About the Ribault River

Figure 2.54 The Ribault River Tributary (WBID 2224) with sanitary sewer overflows reported by JEA in 2019 (JEA 2019b).
Figure 2.54 The Ribault River Tributary (WBID 2224) with sanitary sewer overflows reported by JEA in 2019 (JEA 2019b).
  • Northwest of downtown Jacksonville
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal Coliform, Mercury
  • 2016 Verified Impairment for Iron (2224A, 2224B)
  • WBID Area: 9.7 sq. mi.
  • Beneficial Use: Class III F/M (2224A/B Recreational – Marine, 2224C Recreational – Freshwater)

2.7.25.2. 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 the Ribault River WBIDs 2224, 2224A (marine), 2224B (marine), and 2224C (freshwater) (DEP 2014c) shown above. The filtered dataset reflects water column concentrations and was used to generate Table 2.26.

2.7.25.3. Discussion

Water quality data for the Ribault River are presented in Table 2.26. Limited water quality data were available in STORET for the Ribault River between 2012 and 2017, with no measurements of metals reported from 2007 to 2018.  The average total phosphorus concentration were close to the WQC in 2018 and 2019.  Average chlorophyll­-a levels in the freshwater portion of the Ribault River were lower than the WQC in 2018 and 2019, although they were higher than in other tributaries.  Average chlorophyll-a levels in the marine portions of the Ribault River exceeded the WQC.  The Ribault River is located in a highly residential area and has historically been a contributor to elevated levels of phosphorus found in the tributary. High levels of chlorophyll-a were measured previously and again in 2018 and 2019 (exceeding the WQC in the marine WBIDs), but Ribault River has not been designated impaired (DEP 2016h). The Ribault River has been added to the verified impaired list for iron, and FDEP considers it a medium priority for development of a TMDL to address iron levels (DEP 2016j).  No iron measurements were available from the impaired WBIDs of the Ribault River from 2017-2019.

Historical fecal coliform levels, averaged over all the sampling sites in the Ribault River, were elevated. A TMDL report for fecal coliform in the Ribault River was published in 2006 (Wainwright 2006a), and a BMAP is under development. (Note: the data analyses in the TMDL are based on different criteria than that used in this report).  In 2014, the City of Jacksonville implemented a monitoring program for the Ribault River as part of a bacteria pollution control plan in concert with efforts related to stormwater management (COJ 2017).  Average fecal coliform concentrations and over half of the individual fecal coliform measurements from 2018 and 2019 were higher than the WQC.

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

Table 2.26 Water quality data for the Ribault River.

 Water QualityAverage and Number of Samples º
ParameterCriteria (FW)201720182019
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0)Not available6.29
(0 of 71 samples)
5.89
(2 of 10 samples)
≥4.0 SWNot availableNot available6.02
(9 of 52 samples)
Total Nitrogen (mg/L)<1.540.81
(0 of 5 samples)
0.87
(0 of 11 samples)
0.92
(1 of 12 samples)
Total Phosphorus (mg/L)<0.12Not available0.11
(4 of 12 samples)
0.13
(5 of 12 samples)
Chlorophyll-a (µg/L)<20FWNot available18.65
(4 of 11 samples)
14.00
(0 of 1 sample)
<5.4SWNot availableNot available16.27
(8 of 10 samples)
Arsenic (µg/L)≤50Not availableNot available1.52
(0 of 2 samples)
Cadmium (µg/L)≤0.3 FWNot availableNot available0.01
(0 of 2 samples)
Copper (µg/L)≤9.3 FWNot availableNot available0.60
(0 of 2 samples)
Iron (mg/L)≤1.0 FWNot availableNot available0.28
(0 of 2 samples)
Lead (µg/L)≤3.2FWNot availableNot available0.30
(0 of 2 samples)
Nickel (µg/L)≤52 FWNot availableNot available0.75
(0 of 2 samples)
Silver (µg/L)≤0.07 FWNot availableNot available0.01
(0 of 2 samples)
Zinc (µg/L)≤120 FWNot availableNot available2.50
(0 of 2 samples)
Fecal Coliform (CFU/100 mL)<400Not available2100
(19 of 35 samples)
1290
(23 of 52 samples)
Turbidity (NTU)<29Not available8.89
(0 of 12 samples)
9.54
(0 of 11 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.