Pass
Rating icon - Chlorophyll a Rating icon - Total Nitrogen Rating icon - Total Phosphorous Rating icon - Dissolved Oxygen Saturation

4 out of 4 indicators were rated as PASS.

All four indicators must pass for the creek to be rated as PASS.

Learn more about how this report is created

  • Size: 35,771 acres
  • Location: North Sarasota County, south Manatee County
  • Discharges into: Sarasota Bay

For more information, please see: Phillippi Creek Flood Study Update (2001)

View county-wide water quality trends »

Phillippi Creek

Phillippi Creek

Water Chemistry Ratings | Freshwater Portion of the Creek

Creek Conditions Ratings are based on comparing nitrogen, phosphorus, chlorophyll and dissolved oxygen to water quality guidelines or regulations. Florida law defines a maximum allowable concentration of nitrogen, phosphorus, and chlorophyll a, and a minimum allowable concentration of dissolved oxygen in these streams. Learn more about these ratings and how they are calculated »

Data for the following WBIDs is averaged when compiling the data below:
  • 1937
  • 1941
  • 1966
  • 1971
  • 1971A
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: ug/l Year
2020
Historical
period of record
High 510.00 902.00
Mean 4.2186 4.3634 36.68282
Low 0.35 0.00
No. of Samples 158 3,374

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/L Year
2020
Historical
period of record
High 18.264 21.845
Mean 1.3381 1.3089 1.97073539
Low 0.529 0.124
No. of Samples 152 3,355

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/L Year
2020
Historical
period of record
High 1.80 7.36
Mean 0.3611 0.3846 0.36674977
Low 0.008 0.008
No. of Samples 152 3,870

Five-year Rolling Average

  • Annual Mean
Pass

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources.
Score: Pass
Units: percent (%) Year
2020
Historical
period of record
High 161.791 876.00
Mean 67.14 64.46 34.60807
Low 3.20 0.00
No. of Samples 158 3,780

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2020
Historical
period of record
High 17.30 21.30
Mean 1.55 1.32 1.82992
Low 1.00 0.071
No. of Samples 144 3,141

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2020
Historical
period of record
High 550.00 600.00
Mean 87.68 71.26 42.17299
Low 20.00 0.00
No. of Samples 151 4,133

Five-year Rolling Average

  • Annual Mean

Escherichia coli

Units: MPN/100ml Year
2020
Historical
period of record
High 24196.00 24196.00
Mean 1016.52 792.57 3586.22764
Low 10.00 10.00
No. of Samples 146 1,784

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2020
Historical
period of record
High 13.60 19.60
Mean 0.04 0.03 1.45947642
Low 0.008 0.00
No. of Samples 152 4,141

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2020
Historical
period of record
High 17.90 21.70
Mean 1.1 1.04 1.85799393
Low 0.407 0.002
No. of Samples 152 4,220

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2020
Historical
period of record
High 3.12 9.70
Mean 0.1 0.15 0.54452692
Low 0.004 0.00
No. of Samples 152 3,810

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2020
Historical
period of record
High 10.05 12.00
Mean 7.49 7.35 0.60421
Low 6.65 0.40
No. of Samples 158 4,934

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2020
Historical
period of record
High 12.2812 430.00
Mean 0.3 0.3 7.33015
Low 0.1592 0.00
No. of Samples 162 3,518

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2020
Historical
period of record
High 20256.00 51500.00
Mean 625.76 647.17 1703.50335
Low 330.402 0.369
No. of Samples 163 6,336

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2020
Historical
period of record
High 86.18 139.46
Mean 73.65 73.9 8.61482
Low 58.64 32.00
No. of Samples 14 5,077

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2020
Historical
period of record
High 17.00 240.00
Mean 4.78 4.42 10.44881
Low 1.30 0.091
No. of Samples 7 3,579

Five-year Rolling Average

  • Annual Mean
Other Measures of Creek Health:

Water Chemistry Ratings | Tidal Portion of the Creek

Creek Conditions Ratings are based on comparing nitrogen, phosphorus, chlorophyll and dissolved oxygen to water quality guidelines or regulations. Florida law defines a maximum allowable concentration of chlorophyll a and a minimum allowable concentration of dissolved oxygen in these streams. Florida has no regulatory thresholds for nitrogen or phosphorus in tidal creeks so trends are used to rate the creeks. Learn more about these ratings and how they are calculated »

Data for the following WBIDs is averaged when compiling the data below:
  • 1947
  • 1968D
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: ug/l Year
2020
Historical
period of record
High 17.4 99.1
Mean 4.0475 7.9198 9.82068
Low 1.85 0.25
No. of Samples 12 375

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/L Year
2020
Historical
period of record
High 1.5 8.9
Mean 0.8001 0.9878 1.11350197
Low 0.45 0.131
No. of Samples 12 394

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

No trend was observed after performing a trend analysis.
Score: Pass
Units: mg/L Year
2020
Historical
period of record
High 0.5 2.2
Mean 0.2555 0.3117 0.21786514
Low 0.169 0.084
No. of Samples 12 426

Five-year Rolling Average

  • Annual Mean
Pass

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources
Score: Pass
Units: percent (%) Year
2020
Historical
period of record
High 126.6 530.0
Mean 59.32 61.86 34.85025
Low 39.0383 1.10
No. of Samples 16 373

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2020
Historical
period of record
High 1.8 7.5
Mean 1.11 1.43 0.90825
Low 1.00 0.50
No. of Samples 12 339

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2020
Historical
period of record
High 180.0 280.0
Mean 53.57 51.0 36.57534
Low 30.00 7.00
No. of Samples 12 430

Five-year Rolling Average

  • Annual Mean

Enterococcus Group Bacteria

Units: MPN/100ml Year
2020
Historical
period of record
High 3,800.0 41,000.0
Mean 368.92 518.86 4089.83652
Low 10.00 10.00
No. of Samples 16 108

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2020
Historical
period of record
High 0.5 0.9
Mean 0.13 0.03 0.09038088
Low 0.048 0.00
No. of Samples 12 478

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2020
Historical
period of record
High 1.4 3.1
Mean 0.71 0.82 0.35793013
Low 0.389 0.07
No. of Samples 12 471

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2020
Historical
period of record
High 0.2 5.7
Mean 0.08 0.08 0.31097173
Low 0.031 0.00
No. of Samples 12 422

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2020
Historical
period of record
High 8.0 8.5
Mean 7.27 7.67 0.33859
Low 6.82 5.58
No. of Samples 16 1,989

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2020
Historical
period of record
High 34.6 37.5
Mean 6.41 13.75 11.40965
Low 0.2004 0.00
No. of Samples 20 2,434

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2020
Historical
period of record
High 51,691.4 55,333.0
Mean 11899.52 19354.72 16184.48609
Low 413.805 0.30
No. of Samples 16 2,032

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2020
Historical
period of record
High 82.6 91.4
Mean 75.59 75.41 5.90878
Low 69.26 49.10
No. of Samples 4 1,947

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2020
Historical
period of record
High 21.0
Mean 3.99 2.63925
Low 1.30
No. of Samples 0 407

Five-year Rolling Average

  • Annual Mean
Other Measures of Creek Health:

Oysters

Because they are immobile and will tolerate a fairly wide salinity range, eastern oysters (Crassostrea virginica) are valuable as an indicator of the relative health of aquatic ecosystems in the tidally-influenced portions of coastal creeks. Sarasota County has established an oyster monitoring program to track the location, types, and status of oyster reefs. Data from this monitoring program is shown below. Learn more about Oysters »

Loading oyster site map...
Most Recent Sarasota County Oyster Monitoring Program Data
Icon Site ID Year Dead Live Total % Live
1 PH3 2020 16 34 50 68

Impervious Features

Phillippi Creek is located within the Sarasota Bay Watershed. View details about the Sarasota Bay Watershed »

Rain that falls on land that is in a natural state is absorbed and filtered by soils and vegetation as it makes it way into underground aquifers. However, in developed areas, "impervious surfaces" impede this process and contribute to polluted urban runoff entering surface waters. These surfaces include human infrastructure like roads, sidewalks, driveways and parking lots that are covered by impenetrable materials such as asphalt, concrete, brick and stone, as well as buildings and other permanent structures. Soils that have been disturbed and compacted by urban development are often impervious as well. Learn more about Impervious Features »

The Sarasota County Stormwater Environmental Utility (SEU) mapped impervious surfaces in the County in 2013. A map showing impervious surfaces can be viewed using the Water Atlas Map Viewer tool.

20% of the land area within the Phillippi Creek Basin is covered by impervious surfaces

Impervious Surface Coverage by Type

Land Use / Land Cover

Phillippi Creek is located within the Sarasota Bay Watershed. View details about the Sarasota Bay Watershed »

Land use within a creek's watershed has a major effect on its water quality. In general, less development means better water quality. Land Cover/Land Use classifications categorize land in terms of its observed physical surface characteristics (e.g. upland or wetland), and also reflect the types of activity that are taking place on it (agriculture, urban/built-up, utilities, etc.). Florida uses as its standard a set of statewide classifications which were developed by the Florida Department of Transportation. Learn more about Land Use and Land Cover »

Acreage and Percentage within each Land Use / Land Cover Category for Phillippi Creek Basin
Land Use Classification 1990 1995 1999 2005 2011 2014 2017 2020 Trend
Urban & Built-up 20,77358.1% 22,10961.8% 23,05164.4% 25,70071.8% 26,06672.9% 25,76872% 26,46074% 27,12475.8% Land Use Trend Sparkline
Agriculture 6,39817.9% 6,01816.8% 4,65713% 2,4987% 2,2166.2% 2,3096.5% 1,8225.1% 1,3183.7% Land Use Trend Sparkline
Rangeland 5231.5% 3080.9% 2620.7% 1420.4% 1470.4% 3300.9% 1290.4% 1290.4% Land Use Trend Sparkline
Upland Forests 3,3729.4% 2,6197.3% 2,3636.6% 1,9055.3% 1,7244.8% 1,7715% 1,6184.5% 1,4394% Land Use Trend Sparkline
Water 1,1713.3% 1,3673.8% 1,6064.5% 1,8585.2% 2,0275.7% 1,8835.3% 1,9975.6% 2,0635.8% Land Use Trend Sparkline
Wetlands 2,2736.4% 1,7624.9% 1,7354.8% 1,7154.8% 1,7274.8% 1,8605.2% 1,8195.1% 1,8105.1% Land Use Trend Sparkline
Barren Land 190.1% 1060.3% 6341.8% 90% 990.3% 950.3% 1000.3% 650.2% Land Use Trend Sparkline
Transportation and Utilities 1,2443.5% 1,4814.1% 1,4644.1% 1,9435.4% 1,7674.9% 1,7554.9% 1,8265.1% 1,8235.1% Land Use Trend Sparkline
Land Use Chart