The following data are summarized as seasonal average values for lake and river sampling locations located within the watershed. While these data are useful to serve as a general picture of watershed health, these data must be viewed with caution because these samples have been taken from ecologically different water resources.

Rivers:

Samples from most rivers located in this watershed are averaged as part of these data summaries.

Season	Total Nitrogen	Nitrate (NO3)	Total Phosphorus	Orthophosphate	Number of Sample Stations	Number of Samples
JAN-MAR 2025	1,506 ug/l	360.3 ug/l	370 ug/l	0.26 mg/l	7	10
OCT-DEC 2024	1,895 ug/l	567.3 ug/l	345 ug/l	0.34 mg/l	6	9
JUL-SEP 2024	999 ug/l	64.7 ug/l	556 ug/l	0.54 mg/l	6	8
APR-JUN 2024	1,006 ug/l		581 ug/l	0.19 mg/l	5	7
JAN-MAR 2024	958 ug/l		375 ug/l	0.18 mg/l	6	8
OCT-DEC 2023	908 ug/l		324 ug/l	0.23 mg/l	7	9
JUL-SEP 2023	1,208 ug/l		527 ug/l	0.38 mg/l	6	7
APR-JUN 2023	902 ug/l		597 ug/l	0.25 mg/l	7	10
JAN-MAR 2023	816 ug/l		423 ug/l	0.19 mg/l	6	8
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): Quarterly Routine Water Monitoring, EPC Monthly Routine Water Monitoring, EPC Water Quality Data, EPC Water Quality data gathered from reports, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Polk County Parks & Natural Resources Division, FDEP Watershed Monitoring Section, SWFWMD Water Quality Sampling Data, FDEP Southwest Regional Operations Center, FDEP, Water Quality Standards and Special Projects (Florida), Stream Waterwatch Water Quality Data, Volunteer , USGS National Water Information System, FDEP Watershed Monitoring Section, Environmental Protection Commission of Hillsborough County, Polk County Natural Resources Division, Southwest Florida Water Management District, FDEP - Southwest Regional Operations Center

Lakes:

Samples from most lakes located in this watershed are averaged as part of these data summaries.

Season	Total Nitrogen	Nitrate (NO3)	Total Phosphorus	Orthophosphate	Number of Sample Stations	Number of Samples
JAN-MAR 2025	1,922 ug/l	10.0 ug/l	179 ug/l		4	4
OCT-DEC 2024	1,769 ug/l	10.0 ug/l	225 ug/l		4	5
JUL-SEP 2024	1,825 ug/l	10.0 ug/l	165 ug/l		4	4
APR-JUN 2024	1,570 ug/l		109 ug/l		4	4
JAN-MAR 2024	2,386 ug/l		195 ug/l		4	4
OCT-DEC 2023	2,338 ug/l		138 ug/l		3	3
JUL-SEP 2023	1,459 ug/l		89 ug/l		4	5
APR-JUN 2023	1,424 ug/l		97 ug/l		4	4
JAN-MAR 2023	1,720 ug/l		119 ug/l		4	5
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): Water quality data collected by the City of Lakeland, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Polk County Parks & Natural Resources Division, FDEP Watershed Monitoring Section, SWFWMD Water Quality Sampling Data, FDEP Southwest Regional Operations Center, FDEP, Water Quality Standards and Special Projects (Florida), SWFWMD Water Quality Monitoring Program Data, USGS National Water Information System, Polk County Natural Resources Division, Southwest Florida Water Management District, FDEP - Southwest Regional Operations Center, City of Lakeland

Southwest Florida Water Management District calculates the Aquifer Resource Indicator (ARI) for their three groundwater regions each month. The ARI was created to provide the public with a gauge of groundwater levels in their area, so they can develop an understanding of the severity and cycles of drought and recovery. The three regions include: North (Citrus, Hernando, Lake, Levy, Marion, and Sumter counties), Central (Hillsborough, Pasco, Pinellas, and Polk counties), and South (Charlotte, DeSoto, Hardee, Highlands, Manatee, and Sarasota counties). Learn More about the Aquifer Resource Indicator >>

To determine the ARI for a region, each well is compared weekly to its respective low-normal value and the difference is calculated. The weekly differences are reduced to a monthly value for all monitoring wells within a region, and the resulting ARI value represents how far water levels in the aquifer must rise or fall to reach their respective low-normal values.

Source: SWFWMD Hydrologic Data Section Data

River	Flows Whole River Range	Flows Data by Segment	Levels Whole River Range	Levels Data By Segment
Blackwater Creek	In the past 30 days Average river flow is slower than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
English Creek	In the past 30 days NO DATA Recent river flow data is unavailable.	No data table or graph available	In the past 30 days Average water levels are lower than they have been historically.	Levels Data Table and Graph
Hillsborough River	In the past 30 days Average river flow is slower than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Fox Branch	In the past 30 days Average river flow is slower than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are lower than they have been historically.	Levels Data Table and Graph

Source(s): Not Available

Source(s): Not Available