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 2025	701 ug/l	130.6 ug/l	43 ug/l	0.02 mg/l	14	20
JUL-SEP 2025	926 ug/l	137.2 ug/l	67 ug/l	0.03 mg/l	14	21
APR-JUN 2025	841 ug/l	152.3 ug/l	100 ug/l	0.03 mg/l	14	20
JAN-MAR 2025	743 ug/l	175.4 ug/l	49 ug/l	0.03 mg/l	14	22
OCT-DEC 2024	745 ug/l	185.5 ug/l	64 ug/l	0.03 mg/l	14	22
JUL-SEP 2024	759 ug/l	74.5 ug/l	73 ug/l	0.02 mg/l	14	21
APR-JUN 2024	2,259 ug/l	166.7 ug/l	103 ug/l	0.04 mg/l	13	19
JAN-MAR 2024	997 ug/l	207.7 ug/l	64 ug/l	0.03 mg/l	14	22
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): FDEP Historic Data from Legacy STORET, Seminole County Legacy Storet Data, Legacy Orange County Surface Water Quality, Seminole County Water Quality Data, SJRWMD Water Quality Data, FDEP Central Regional Operations Center, FDEP Watershed Monitoring Section, Orange County Surface Water Quality, FDEP, Water Quality Standards and Special Projects (Florida), FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, Orange County Environmental Protection Division, St. Johns River Water Management District

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
OCT-DEC 2025	667 ug/l	44.7 ug/l	16 ug/l	0.01 mg/l	13	13
JUL-SEP 2025	712 ug/l	33.0 ug/l	19 ug/l	0.01 mg/l	13	14
APR-JUN 2025	692 ug/l	27.3 ug/l	17 ug/l	0.01 mg/l	12	12
JAN-MAR 2025	764 ug/l	76.2 ug/l	30 ug/l	0.01 mg/l	14	17
OCT-DEC 2024	619 ug/l	65.8 ug/l	37 ug/l	0.01 mg/l	15	17
JUL-SEP 2024	1,007 ug/l	30.3 ug/l	34 ug/l	0.01 mg/l	14	19
APR-JUN 2024	1,284 ug/l	24.0 ug/l	51 ug/l	0.01 mg/l	15	17
JAN-MAR 2024	953 ug/l	104.0 ug/l	26 ug/l	0.01 mg/l	13	15
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): LAKEWATCH Supplemental Water Quality Sampling, LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Seminole County Legacy Storet Data, Legacy Orange County Surface Water Quality, Seminole County Water Quality Data, SJRWMD Water Quality Data, FDEP Central Regional Operations Center, FDEP Watershed Monitoring Section, Orange County Surface Water Quality, FDEP, Water Quality Standards and Special Projects (Florida), City of Casselberry, FDEP - Central Regional Operations Center, FDEP Watershed Monitoring Section, Florida LAKEWATCH

River	Flows Whole River Range	Flows Data by Segment	Levels Whole River Range	Levels Data By Segment
Howell 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