2.7.22. Ortega River

2.7.22.1. About the Ortega River

Figure 2.56
Figure 2.57 The Ortega River Tributary (WBID 2213P1 and 2249A).
  • West of NAS Jacksonville
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal Coliform – 2213P1 DO/Nutrient   2213P1 (draft)
  • Verified Impaired 2016 (final): None
  • WBID Area: 29.0 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater)

2.7.22.2. Data sources

Result data were downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in the Ortega River WBID 2213P1 and 2249A (DEP 2014d) shown above. The filtered dataset was used to generate Table 2.23.

2.7.22.3. Discussion

Water quality data for the Ortega River are shown in Table 2.23. Average total nitrogen, total phosphorus, dissolved oxygen and chlorophyll-a concentrations were within acceptable limits. The fecal coliform level, averaged over all the sampling sites in the Ortega River, is below the critical level of 2.6, which is the logarithm of the state maximum of 400 colony-forming-units per 100 mL. The average at each individual sampling site also falls below the critical level. However, this analysis brings together data from both WBIDs and if the data is separated by WBID, WBID 2213P1 (downstream) has a significantly higher fecal coliform level than WBID 2249A. The TMDL reports for fecal coliform (Rhew 2009e) and DO/Nutrients (Magley 2009b) published in 2009 referred to WBID 2213P, of which WBID 2213P1 is a subset as a result of changes to the WBID boundaries.

Table 2.23 Water quality data for the Ortega River.
Water QualityConcentrationSampling
ParameterCriteria (FW)LowAverageHighSamplesPeriod
Dissolved Oxygen (mg/L)34% sat. (~3.0)0.254.2711.62121998 - 2016
Total Nitrogen (mg/L)<1.540.160.852.471701998 - 2014
Total Phosphorus (mg/L)<0.120.020.090.842061998 - 2016
Chlorophyll-a (µg/L)<2002.09641121998 - 2016
Arsenic (µg/L)≤5002.5646.8741998 - 2016
Cadmium (µg/L)≤0.300.162.5631998 - 2016
Copper (µg/L)≤9.301.6116.78991998 - 2016
Lead (µg/L)≤3.20.0916.74751998 - 2016
Nickel (µg/L)≤5201.3620.8821998 - 2016
Silver (µg/L)≤0.0700.151.24322004 - 2016
Zinc (µg/L)≤1201.558.0331.23991998 - 2016
Fecal Coliform (log #/100 mL)<2.6-0.32.124.042951999 - 2013
Turbidity (NTU)<290.433.5641221998 - 2016
Note: Hardness-dependent freshwater criteria for cadmium, copper, lead, nickel, and zinc were generated based on a hardness concentration of 100 mg/L.
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.