2.7.25. Ribault River

2.7.25.1. About the Ribault River

Figure 2.59
Figure 2.60 The Ribault River Tributary (WBID 2224).
  • Northwest of downtown Jacksonville
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal Coliform, Mercury
  • Verified Impaired 2016 (final): Iron (med)
  • WBID Area: 9.7 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater)

2.7.25.2. 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 Ribault River WBID 2224 (DEP 2014c) shown above. No water quality data for the selected parameters discussed below for the Ribault River were available in STORET for 2015-2017.

2.7.25.3. Discussion

Water quality data for the Ribault River are presented in Table 2.26. No water quality data were available in STORET for the Ribault River between 2012 and 2017, and the last measurements of metals date back to 2007.  The average total phosphorus concentration is near 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 (although the average did not exceed the WQC), but Ribault River has not been designated impaired (DEP 2016h). The Ribault River has been added to the verified impaired list for iron (DEP 2016j).

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).  Fecal coliform measurements from 2018 show elevated levels, with over half of the measurements exceeding the WQC.

No recent measurements were available in WIN or STORET between 2016 and 2018 for the following parameters:

  • Arsenic
  • Cadmium
  • Copper
  • Lead
  • Nickel
  • Silver
  • Zinc

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)201620172018
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0)Not availableNot available6.29
(0 of 71 samples)
Total Nitrogen (mg/L)<1.54Not available0.81
(0 of 5 samples)
0.87
(0 of 11 samples)
Total Phosphorus (mg/L)<0.12Not availableNot available0.11
(4 of 12 samples)
Chlorophyll-a (µg/L)<20Not availableNot available18.65
(4 of 11 samples)
Fecal Coliform (CFU/100 mL)<400Not availableNot available2100
(19 of 35 samples)
Turbidity (NTU)<29Not availableNot available8.89
(0 of 12 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.