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			58 ug/l		2	4
OCT-DEC 2025			68 ug/l		20	48
JUL-SEP 2025	1,111 ug/l		119 ug/l	0.04 mg/l	22	33
APR-JUN 2025	841 ug/l		90 ug/l	0.08 mg/l	21	56
JAN-MAR 2025	1,299 ug/l		84 ug/l	0.07 mg/l	21	38
OCT-DEC 2024	1,060 ug/l		82 ug/l	0.03 mg/l	21	35
JUL-SEP 2024	874 ug/l		78 ug/l	0.04 mg/l	24	40
APR-JUN 2024	993 ug/l		81 ug/l	0.03 mg/l	20	52
JAN-MAR 2024	1,075 ug/l		52 ug/l		12	29
Five Year Seasonal Graph	Graph		Graph	Graph
Five Year Graph of All Samples	Graph		Graph	Graph

Source(s): Lake County Surface Water Quality, FDEP Historic Data from Legacy STORET, FFWCC Legacy Storet Data, Seminole County Legacy Storet Data, Volusia County Water Quality Data, SJRWMD Water Quality Data, FDEP Central Regional Operations Center, Florida Fish and Wildlife Conservation Commission Water Quality Data, FDEP Watershed Monitoring Section, Volusia County Sampling Data, FDEP, Water Quality Standards and Special Projects (Florida), Watershed Action Volunteer Water Quality Data, FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, Lake County Water Resource Management, St. Johns River Water Management District, Volusia County Sampling Data

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 2025	699 ug/l		49 ug/l	0.02 mg/l	7	7
APR-JUN 2025	289 ug/l		10 ug/l		6	6
JAN-MAR 2025	208 ug/l		8 ug/l		3	3
OCT-DEC 2024	267 ug/l		9 ug/l		9	9
JUL-SEP 2024	448 ug/l		11 ug/l	0.02 mg/l	15	21
APR-JUN 2024	485 ug/l		20 ug/l	0.03 mg/l	14	14
JAN-MAR 2024	331 ug/l		9 ug/l		9	16
Five Year Seasonal Graph	Graph		Graph	Graph
Five Year Graph of All Samples	Graph		Graph	Graph

Source(s): Lake County Surface Water Quality, LAKEWATCH Supplemental Water Quality Sampling, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, SJRWMD Water Quality Data, FDEP Central Regional Operations Center, FDEP Watershed Monitoring Section, FDEP, Water Quality Standards and Special Projects (Florida), Watershed Action Volunteer Water Quality Data, FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Lake County Water Resource Management

• 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
Saint Johns 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
Wekiva 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
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 lower than they have been historically.	Levels Data Table and Graph

Source(s): Not Available

Source(s): Not Available