Explore general as well as scientific information about the movement, chemistry and biology of area surface and ground water environments.
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.
Season | Total Nitrogen | Nitrate (NO3) | Total Phosphorus | Orthophosphate | Number of Sample Stations | Number of Samples |
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JAN-MAR 2022 | 926 ug/l | 549.0 ug/l | 324 ug/l | 0.29 mg/l | 91 | 137 |
OCT-DEC 2021 | 1,057 ug/l | 460.8 ug/l | 453 ug/l | 0.34 mg/l | 107 | 213 |
JUL-SEP 2021 | 1,090 ug/l | 307.2 ug/l | 583 ug/l | 25.76 mg/l | 110 | 220 |
APR-JUN 2021 | 907 ug/l | 337.8 ug/l | 443 ug/l | 35.37 mg/l | 98 | 199 |
JAN-MAR 2021 | 1,018 ug/l | 423.8 ug/l | 415 ug/l | 28.8 mg/l | 132 | 249 |
OCT-DEC 2020 | 1,039 ug/l | 332.1 ug/l | 503 ug/l | 35.29 mg/l | 123 | 244 |
JUL-SEP 2020 | 1,271 ug/l | 234.6 ug/l | 693 ug/l | 67 mg/l | 127 | 256 |
APR-JUN 2020 | 1,173 ug/l | 348.8 ug/l | 597 ug/l | 57.01 mg/l | 94 | 123 |
JAN-MAR 2020 | 1,307 ug/l |
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356 ug/l | 21.6 mg/l | 116 | 193 |
Five Year Seasonal Graph | ||||||
Five Year Graph of All Samples |
Season | Total Nitrogen | Nitrate (NO3) | Total Phosphorus | Orthophosphate | Number of Sample Stations | Number of Samples |
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JAN-MAR 2022 | 1,488 ug/l |
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203 ug/l | 0.09 mg/l | 9 | 12 |
OCT-DEC 2021 | 1,182 ug/l |
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161 ug/l | 0.09 mg/l | 12 | 18 |
JUL-SEP 2021 | 1,019 ug/l |
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96 ug/l | 0.2 mg/l | 57 | 78 |
APR-JUN 2021 | 1,644 ug/l |
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135 ug/l | 34.15 mg/l | 58 | 82 |
JAN-MAR 2021 | 1,318 ug/l |
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92 ug/l | 25.22 mg/l | 73 | 100 |
OCT-DEC 2020 | 988 ug/l |
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104 ug/l | 38.3 mg/l | 62 | 82 |
JUL-SEP 2020 | 1,512 ug/l |
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131 ug/l | 41.28 mg/l | 55 | 66 |
APR-JUN 2020 | 1,442 ug/l |
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94 ug/l | 41.86 mg/l | 57 | 76 |
JAN-MAR 2020 | 1,186 ug/l |
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77 ug/l | 23.94 mg/l | 78 | 145 |
Five Year Seasonal Graph |
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Five Year Graph of All Samples |
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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.
Stream level and flow data for the Hillsborough Bay Watershed. Learn More about Stream Flow »
River | Flows Whole River Range | Flows Data by Segment | Levels Whole River Range | Levels Data By Segment |
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Alafia River - North Prong |
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Fivemile Creek |
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North Archie Creek |
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Bullfrog Creek |
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Cypress Creek |
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Fox Branch |
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Alafia River |
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Alafia River - South Prong |
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Archie Creek |
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Baker Creek |
NO DATA Recent river flow data is unavailable. |
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Blackwater Creek |
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Delaney Creek |
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Hillsborough River |
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Little Alafia River |
NO DATA Recent river flow data is unavailable. |
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Thirtymile Creek |
NO DATA Recent river flow data is unavailable. |
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Curiosity Creek |
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Flint Creek |
NO DATA Recent river flow data is unavailable. |
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Delaney Creek Popoff Canal |
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Trout Creek |
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Bellows Lake Outlet |
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Source(s): Not Available
Source(s): Not Available