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
OCT-DEC 2023	1,040 ug/l		59 ug/l		8	15
JUL-SEP 2023	1,392 ug/l		105 ug/l		12	13
APR-JUN 2023	1,122 ug/l		93 ug/l	0.04 mg/l	21	44
JAN-MAR 2023	1,349 ug/l		92 ug/l		19	36
OCT-DEC 2022	1,137 ug/l		145 ug/l	0.03 mg/l	21	35
JUL-SEP 2022	1,037 ug/l		85 ug/l		19	34
APR-JUN 2022	1,002 ug/l		87 ug/l	0.03 mg/l	22	39
JAN-MAR 2022	1,204 ug/l		60 ug/l		19	36
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), USGS National Water Information System, Watershed Action Volunteer Water Quality Data, FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, 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 2023	306 ug/l		8 ug/l		9	18
APR-JUN 2023	455 ug/l		11 ug/l		6	6
JAN-MAR 2023	570 ug/l		11 ug/l		6	6
OCT-DEC 2022	505 ug/l		12 ug/l		6	6
JUL-SEP 2022	239 ug/l		9 ug/l		9	18
APR-JUN 2022	219 ug/l		9 ug/l		9	18
JAN-MAR 2022	281 ug/l		9 ug/l		9	9
Five Year Seasonal Graph	Graph		Graph
Five Year Graph of All Samples	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

• 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 higher than they have been historically.	Levels Data Table and Graph
Blackwater Creek	In the past 30 days Average river flow is faster 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