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 2026	963 ug/l	177.3 ug/l	179 ug/l	0.12 mg/l	13	22
JAN-MAR 2026	923 ug/l	156.3 ug/l	161 ug/l	0.09 mg/l	14	34
OCT-DEC 2025	1,023 ug/l	153.3 ug/l	153 ug/l	0.11 mg/l	22	45
JUL-SEP 2025	1,199 ug/l	275.0 ug/l	248 ug/l	0.15 mg/l	20	32
APR-JUN 2025	1,035 ug/l	193.3 ug/l	163 ug/l	0.09 mg/l	21	36
JAN-MAR 2025	1,131 ug/l	360.3 ug/l	167 ug/l	0.11 mg/l	21	44
OCT-DEC 2024	1,389 ug/l	567.3 ug/l	238 ug/l	0.17 mg/l	23	52
JUL-SEP 2024	949 ug/l	64.7 ug/l	309 ug/l	0.28 mg/l	23	44
APR-JUN 2024	954 ug/l		173 ug/l	0.07 mg/l	20	40
JAN-MAR 2024	886 ug/l		143 ug/l	0.05 mg/l	22	43
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, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Polk County Parks & Natural Resources Division, Biological Research Associates , FDEP Watershed Monitoring Section, 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 , FDEP Watershed Monitoring Section, 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

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 2026	2,319 ug/l	13.5 ug/l	159 ug/l		4	4
JAN-MAR 2026	1,810 ug/l	10.0 ug/l	124 ug/l		8	9
OCT-DEC 2025	1,409 ug/l	40.0 ug/l	75 ug/l		8	11
JUL-SEP 2025	1,185 ug/l	10.0 ug/l	71 ug/l		8	14
APR-JUN 2025	1,474 ug/l	10.8 ug/l	72 ug/l		8	15
JAN-MAR 2025	1,271 ug/l	10.0 ug/l	101 ug/l		8	8
OCT-DEC 2024	988 ug/l	10.0 ug/l	102 ug/l		8	13
JUL-SEP 2024	1,079 ug/l	11.5 ug/l	93 ug/l		8	14
APR-JUN 2024	1,023 ug/l		48 ug/l		8	14
JAN-MAR 2024	1,311 ug/l		74 ug/l		9	15
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): Water quality data collected by the City of Lakeland, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Polk County Parks & Natural Resources Division, 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 Monitoring Program Data, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Polk County Natural Resources Division, Southwest Florida Water Management District, FDEP - Southwest Regional Operations Center, City of Lakeland

• 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
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
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
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 higher 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 the same as 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
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

Source(s): Not Available

Source(s): Not Available