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 2026	875 ug/l		159 ug/l	0.15 mg/l	7	7
OCT-DEC 2025	1,255 ug/l		247 ug/l	0.22 mg/l	27	50
JUL-SEP 2025	1,342 ug/l		308 ug/l	0.39 mg/l	36	59
APR-JUN 2025	1,233 ug/l		328 ug/l	0.29 mg/l	30	42
JAN-MAR 2025	1,037 ug/l		262 ug/l	0.19 mg/l	32	55
OCT-DEC 2024	1,502 ug/l		263 ug/l	0.28 mg/l	33	59
JUL-SEP 2024	1,360 ug/l		367 ug/l	0.42 mg/l	37	67
APR-JUN 2024	786 ug/l		241 ug/l	0.21 mg/l	33	53
JAN-MAR 2024	1,184 ug/l		241 ug/l	0.15 mg/l	38	67
Five Year Seasonal 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, Hillsborough County Lake Assessments, EPC Water Quality Data, EPC Water Quality data gathered from reports, Hillsborough County Environmental Management Division, LAKEWATCH Volunteer Water Quality Monitoring, Legacy Pinellas Water Quality Data, FDEP Historic Data from Legacy STORET, PINELLAS Water Quality Data, FDEP Watershed Monitoring Section, IMC Agrico (Florida), Manatee County Environmental Management Sampling Data, SWFWMD Water Quality Sampling Data, FDEP Southwest Regional Operations Center, FDEP, Water Quality Standards and Special Projects (Florida), Stream Waterwatch Water Quality Data, Volunteer , City of St. Petersburg, FDEP Watershed Monitoring Section, Hillsborough County Environmental Services Division, Environmental Protection Commission of Hillsborough County, Florida LAKEWATCH, Manatee County Environmental Management Sampling Data, Mosaic Fertilizer, LLC, 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
OCT-DEC 2025			102 ug/l		5	10
JUL-SEP 2025	692 ug/l		91 ug/l		8	17
APR-JUN 2025	722 ug/l		145 ug/l		8	13
JAN-MAR 2025			121 ug/l		5	7
OCT-DEC 2024	696 ug/l		66 ug/l		8	20
JUL-SEP 2024	514 ug/l		87 ug/l		8	16
APR-JUN 2024	582 ug/l		135 ug/l		8	18
JAN-MAR 2024	990 ug/l		122 ug/l		8	11
Five Year Seasonal Graph	Graph		Graph
Five Year Graph of All Samples	Graph		Graph

Source(s): EPC Water Quality data gathered from reports, LAKEWATCH Supplemental Water Quality Sampling, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, PINELLAS Water Quality Data, 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 Sampling Data (Ken Romie), SWFWMD Water Quality Monitoring Program Data, City of St. Petersburg, FDEP Watershed Monitoring Section, Florida LAKEWATCH, FDEP - Southwest Regional Operations Center, FDEP - Watershed Assessment Section

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
Little Manatee 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 lower than they have been historically.	Levels Data Table and Graph
Little Manatee River - South Fork	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
Sawgrass Lake East Outfall Canal	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