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	1,659 ug/l		238 ug/l	0.2 mg/l	8	8
OCT-DEC 2024	2,022 ug/l		126 ug/l	0.07 mg/l	8	21
JUL-SEP 2024	1,789 ug/l		149 ug/l	0.01 mg/l	8	21
APR-JUN 2024	1,978 ug/l		260 ug/l	0.08 mg/l	7	10
JAN-MAR 2024	1,480 ug/l		79 ug/l	0.01 mg/l	1	1
OCT-DEC 2023	2,029 ug/l		235 ug/l	0.06 mg/l	8	21
JUL-SEP 2023	2,722 ug/l		153 ug/l	0.03 mg/l	8	22
APR-JUN 2023	2,516 ug/l		210 ug/l	0.08 mg/l	7	16
JAN-MAR 2023	3,037 ug/l		152 ug/l	0.07 mg/l	8	20
Five Year Seasonal Graph	Graph		Graph	Graph
Five Year Graph of All Samples	Graph		Graph	Graph

Source(s): Hillsborough County Lake Assessments, Hillsborough County Environmental Management Division, FDEP Watershed Monitoring Section, FDEP Southwest Regional Operations Center, Hillsborough County Environmental Services Division, Environmental Protection Commission of Hillsborough County, 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	2,804 ug/l		93 ug/l		1	1
OCT-DEC 2024	2,498 ug/l		104 ug/l		7	8
JUL-SEP 2024	1,710 ug/l		90 ug/l		7	8
APR-JUN 2024	3,774 ug/l		155 ug/l		9	9
JAN-MAR 2024	3,439 ug/l		142 ug/l		3	8
OCT-DEC 2023	1,919 ug/l		89 ug/l		9	15
JUL-SEP 2023	2,720 ug/l		102 ug/l		9	15
APR-JUN 2023	5,149 ug/l		124 ug/l		8	11
JAN-MAR 2023	4,719 ug/l		133 ug/l		9	14
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, Hillsborough County Environmental Management Division, 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, Hillsborough County Environmental Services Division, Florida LAKEWATCH, 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
Bellows Lake Outlet	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

Source(s): Not Available

Source(s): Not Available