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	1,237 ug/l	566.0 ug/l	633 ug/l	0.29 mg/l	91	145
OCT-DEC 2025	1,358 ug/l	608.8 ug/l	387 ug/l	0.38 mg/l	112	217
JUL-SEP 2025	1,332 ug/l	359.5 ug/l	574 ug/l	0.51 mg/l	105	198
APR-JUN 2025	1,220 ug/l	366.1 ug/l	475 ug/l	0.44 mg/l	104	198
JAN-MAR 2025	1,374 ug/l	574.8 ug/l	390 ug/l	0.3 mg/l	132	274
OCT-DEC 2024	1,653 ug/l	516.4 ug/l	500 ug/l	0.39 mg/l	136	287
JUL-SEP 2024	1,201 ug/l	191.1 ug/l	685 ug/l	0.56 mg/l	136	287
APR-JUN 2024	1,047 ug/l	368.6 ug/l	452 ug/l	0.36 mg/l	119	246
JAN-MAR 2024	1,116 ug/l	435.5 ug/l	449 ug/l	0.28 mg/l	117	240
Five Year Seasonal Graph	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, FDEP Historic Data from Legacy STORET, Polk County Parks & Natural Resources Division, Biological Research Associates , FDEP Watershed Monitoring Section, IMC Agrico (Florida), Polk County Natural Resources Division, SWFWMD Water Quality Sampling Data, Tampa Bay Water, FDEP Southwest Regional Operations Center, FDEP, Water Quality Standards and Special Projects (Florida), Stream Waterwatch Water Quality Data, Volunteer , USGS National Water Information System, FDEP Watershed Monitoring Section, Hillsborough County Environmental Services Division, Environmental Protection Commission of Hillsborough County, Pasco County Stormwater Management Division, Polk County Natural Resources Division, Southwest Florida Water Management District, Tampa Bay Water, FDEP - Southwest Regional Operations Center, 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
JAN-MAR 2026	3,512 ug/l	10.0 ug/l	245 ug/l	0.06 mg/l	18	20
OCT-DEC 2025	1,806 ug/l	34.8 ug/l	104 ug/l	0.14 mg/l	60	74
JUL-SEP 2025	1,205 ug/l	12.0 ug/l	98 ug/l	0.41 mg/l	71	106
APR-JUN 2025	2,677 ug/l	10.5 ug/l	180 ug/l	0.54 mg/l	33	42
JAN-MAR 2025	1,549 ug/l	10.0 ug/l	127 ug/l	0.35 mg/l	50	62
OCT-DEC 2024	1,094 ug/l	10.0 ug/l	113 ug/l	0.41 mg/l	70	122
JUL-SEP 2024	1,099 ug/l	12.2 ug/l	105 ug/l	0.26 mg/l	69	123
APR-JUN 2024	1,549 ug/l		81 ug/l	0.08 mg/l	67	129
JAN-MAR 2024	1,245 ug/l		75 ug/l	0.08 mg/l	65	143
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): 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, Water quality data collected by the City of Lakeland, LAKEWATCH Supplemental Water Quality Sampling, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Polk County Parks & Natural Resources Division, Florida Fish and Wildlife Conservation Commission Water Quality Data, FDEP Watershed Monitoring Section, Polk County Natural Resources Division, 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, FDEP Watershed Monitoring Section, Hillsborough County Environmental Services Division, Environmental Protection Commission of Hillsborough County, Florida LAKEWATCH, Polk County Natural Resources Division, Southwest Florida Water Management District, FDEP - Southwest Regional Operations Center, FDEP - Watershed Assessment Section, City of Lakeland

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
Alafia 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
Alafia River - North Prong	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
Alafia River - South Prong	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
Archie 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 NO DATA Recent water level data is unavailable.	No data table or graph available
Baker 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
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
Bullfrog 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
Delaney 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
Flint Creek	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
Hillsborough 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 Alafia River	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
Thirtymile Creek	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 higher than they have been historically.	Levels Data Table and Graph
Trout 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
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 NO DATA Recent water level data is unavailable.	No data table or graph available
Cypress 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
North Archie 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 NO DATA Recent water level data is unavailable.	No data table or graph available
Fivemile 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 NO DATA Recent water level data is unavailable.	No data table or graph available
Fox Branch	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