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
JUL-SEP 2024	701 ug/l		93 ug/l	0.05 mg/l	4	12
APR-JUN 2024	1,116 ug/l		99 ug/l	0.04 mg/l	4	10
JAN-MAR 2024	1,078 ug/l		72 ug/l	0.02 mg/l	4	12
OCT-DEC 2023	970 ug/l		140 ug/l	0.04 mg/l	4	11
JUL-SEP 2023	1,064 ug/l		140 ug/l	0.05 mg/l	4	8
APR-JUN 2023	910 ug/l		145 ug/l	0.06 mg/l	3	9
JAN-MAR 2023	1,061 ug/l		87 ug/l	0.04 mg/l	4	12
OCT-DEC 2022	1,288 ug/l		91 ug/l	0.06 mg/l	4	12
JUL-SEP 2022	1,079 ug/l		67 ug/l	0.05 mg/l	4	12
APR-JUN 2022	824 ug/l		52 ug/l	0.03 mg/l	4	12
JAN-MAR 2022	807 ug/l		66 ug/l	0.06 mg/l	4	12
Five Year Seasonal Graph	Graph		Graph	Graph
Five Year Graph of All Samples	Graph		Graph	Graph

Source(s): EPC Monthly Routine Water Monitoring, Hillsborough County Lake Assessments, EPC Water Quality Data, EPC Water Quality data gathered from reports, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, FDEP Watershed Monitoring Section, FDEP Southwest Regional Operations Center, Stream Waterwatch Water Quality Data, Volunteer , USGS National Water Information System, Environmental Protection Commission of Hillsborough County

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
JUL-SEP 2024	744 ug/l		14 ug/l		1	2
APR-JUN 2024	797 ug/l		18 ug/l		4	4
JAN-MAR 2024	1,045 ug/l		27 ug/l		4	10
OCT-DEC 2023	946 ug/l		20 ug/l		3	9
JUL-SEP 2023	783 ug/l		19 ug/l		3	8
JAN-MAR 2023	773 ug/l		20 ug/l		3	3
OCT-DEC 2022	790 ug/l		17 ug/l		3	3
JUL-SEP 2022	860 ug/l		23 ug/l		3	6
APR-JUN 2022	887 ug/l		26 ug/l		3	3
JAN-MAR 2022	917 ug/l		26 ug/l		3	3
Five Year Seasonal Graph	Graph		Graph
Five Year Graph of All Samples	Graph		Graph

Source(s): Hillsborough County Lake Assessments, EPC Water Quality data gathered from reports, LAKEWATCH Supplemental Water Quality Sampling, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Watershed Monitoring Section, SWFWMD Water Quality Sampling Data, FDEP Southwest Regional Operations Center, SWFWMD Water Quality Sampling Data (Ken Romie), SWFWMD Water Quality Monitoring Program Data, USGS National Water Information System, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Southwest Florida Water Management District, FDEP - Southwest Regional Operations Center

• Water Quality Sampling Locations - View a map showing the point locations of water quality monitoring stations which collect data being presented on the Water Atlas.

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
Double Branch 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

Source(s): Not Available

Source(s): Not Available