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
APR-JUN 2025	354 ug/l		18 ug/l		1	1
JAN-MAR 2025	1,628 ug/l		67 ug/l	0.02 mg/l	24	33
OCT-DEC 2024	1,527 ug/l		106 ug/l	0.02 mg/l	23	35
JUL-SEP 2024	1,438 ug/l		123 ug/l	0.06 mg/l	37	62
APR-JUN 2024	1,347 ug/l		65 ug/l	0.06 mg/l	30	45
JAN-MAR 2024	1,560 ug/l		68 ug/l	0.03 mg/l	47	76
OCT-DEC 2023	1,245 ug/l	119.0 ug/l	53 ug/l	0.03 mg/l	23	38
JUL-SEP 2023	1,193 ug/l	56.0 ug/l	76 ug/l	0.03 mg/l	28	50
APR-JUN 2023	1,250 ug/l	157.0 ug/l	53 ug/l	0.03 mg/l	25	42
JAN-MAR 2023	1,308 ug/l	115.0 ug/l	65 ug/l	0.04 mg/l	29	47
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): Lake County Surface Water Quality, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, SJRWMD Water Quality Data, Biological Research Associates , FDEP Central Regional Operations Center, Florida Fish and Wildlife Conservation Commission Water Quality Data, FDEP Watershed Monitoring Section, Orange County Surface Water Quality, USGS National Water Information System, Watershed Action Volunteer Water Quality Data, FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Lake County Water Resource Management, Orange County Environmental Protection Division, St. Johns River Water Management District, FDEP - Watershed Assessment Section

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
APR-JUN 2025	1,012 ug/l		44 ug/l	0.01 mg/l	27	27
JAN-MAR 2025	1,339 ug/l		46 ug/l	0.01 mg/l	98	137
OCT-DEC 2024	1,219 ug/l		91 ug/l	0.01 mg/l	77	120
JUL-SEP 2024	1,056 ug/l		64 ug/l	0.04 mg/l	148	226
APR-JUN 2024	1,160 ug/l		52 ug/l	0.03 mg/l	154	241
JAN-MAR 2024	1,164 ug/l		50 ug/l	0.03 mg/l	159	286
OCT-DEC 2023	1,126 ug/l	11.0 ug/l	40 ug/l	0.01 mg/l	100	218
JUL-SEP 2023	1,122 ug/l	4.0 ug/l	58 ug/l	0.02 mg/l	108	232
APR-JUN 2023	1,038 ug/l	4.0 ug/l	41 ug/l	0.01 mg/l	112	227
JAN-MAR 2023	1,052 ug/l	4.0 ug/l	58 ug/l	0.03 mg/l	121	231
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	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, Orange County Environmental Protection Division, Legacy Orange County Surface Water Quality, SJRWMD Water Quality Data, Biological Research Associates , FDEP Central Regional Operations Center, Florida Fish and Wildlife Conservation Commission Water Quality Data, FDEP Watershed Monitoring Section, Orange County Surface Water Quality, 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, Florida LAKEWATCH, Lake County Water Resource Management, Orange County Environmental Protection Division, St. Johns River Water Management District, FDEP - Watershed Assessment Section

• 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
Apopka Beauclair Canal	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
Haynes 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 higher than they have been historically.	Levels Data Table and Graph
Palatlakaha 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
Little 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
Big 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 higher than they have been historically.	Levels Data Table and Graph
Wolf Branch	In the past 30 days Average river flow is the same as 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
Ocklawaha 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
Griffin Flowway	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
Green Swamp Run	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