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

Phillippi Creek Basin consists primarily of residential properties west of Interstate 75, with commercial properties situated along the major arterial transportation routes. The area east of Interstate 75 is primarily rural with scattered low density residential area. Much of the area east of Interstate 75 is in agriculture use. Phillippi Creek drains from the north and northeast to south and southwest. The major conveyance system in the watershed consists of approximately 47 miles of open channels, most of which have been dredged in the past. The soils in the Phillippi Creek Watershed are primarily Myakka with the upland soils containing poorly to very poorly drained sands and the stream-side soils consisting of sands that are better drained. For basin details see: Phillippi Creek Flood Study Update (2001)

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: mg/l Year
2012
Historical
period of record
High 0.0339 0.115
Mean 0.003 0.0036 0.01007125
Low 0.0004 0.00
No. of Samples 181 1,526

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 1.33 19.23
Mean 0.8011 1.2032 1.62716731
Low 0.428 0.144
No. of Samples 56 1,447

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 1.63 7.36
Mean 0.3733 0.442 0.42134079
Low 0.071 0.034
No. of Samples 170 1,997

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
2012
Historical
period of record
High 252.50 252.50
Mean 80.5 68.46 33.6912
Low 22.60 0.00
No. of Samples 242 2,540

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2012
Historical
period of record
High 5.06 21.30
Mean 0.94 1.29 2.04809
Low 0.50 0.071
No. of Samples 142 1,357

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2012
Historical
period of record
High 350.00
Mean 64.28 42.64594
Low 0.00
No. of Samples 0 990

Five-year Rolling Average

  • Annual Mean

Escherichia coli

Units: cfu/100ml Year
2012
Historical
period of record
High 3400.00
Mean 234.88 954.33575
Low 26.00
No. of Samples 0 19

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2012
Historical
period of record
High 405.00 6696.00
Mean 24.76 23.11 262.88295
Low 8.00 0.00
No. of Samples 170 2,305

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2012
Historical
period of record
High 1540.00 17560.00
Mean 709.54 883.15 927.56278
Low 376.00 2.00
No. of Samples 170 2,347

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2012
Historical
period of record
High 592.00 7556.00
Mean 56.73 158.87 458.26447
Low 4.00 0.00
No. of Samples 170 1,974

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2012
Historical
period of record
High 8.35 9.61
Mean 7.67 7.44 0.36747
Low 7.20 3.90
No. of Samples 196 2,823

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2012
Historical
period of record
High 0.59 19.24
Mean 0.35 0.32 0.71804
Low 0.12 0.00
No. of Samples 175 1,749

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2012
Historical
period of record
High 1176.00 51500.00
Mean 718.83 582.24 1187.51642
Low 263.00 0.369
No. of Samples 207 3,482

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2012
Historical
period of record
High 88.088 94.82
Mean 74.86 72.23 8.37869
Low 55.76 46.40
No. of Samples 145 2,352

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2012
Historical
period of record
High 11.00 112.00
Mean 2.97 3.9 6.90931
Low 0.95 0.091
No. of Samples 170 2,233

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
Chart Legend
  • Trend Line
  • Annual Mean
  • Threshold
Pass

Chlorophyll a

Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.0 0.1
Mean 0.0063 0.0075 0.00986607
Low 0.0029 0.0003
No. of Samples 36 197

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Trend analysis shows a weak decreasing trend.
Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 1.2 8.9
Mean 0.737 1.0274 1.56311323
Low 0.458 0.131
No. of Samples 12 184

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Trend analysis shows a weak decreasing trend.
Score: Pass
Units: mg/l Year
2012
Historical
period of record
High 0.3 2.2
Mean 0.1989 0.3049 0.2605112
Low 0.132 0.084
No. of Samples 36 266

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
2012
Historical
period of record
High 88.3 210.0
Mean 58.72 66.86 22.54196
Low 36.2655 26.80
No. of Samples 28 278

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2012
Historical
period of record
High 2.4 7.5
Mean 1.29 1.62 0.91807
Low 0.855 0.50
No. of Samples 34 175

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2012
Historical
period of record
High 280.0
Mean 52.1 42.4551
Low 15.00
No. of Samples 0 118

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: ug/l Year
2012
Historical
period of record
High 153.0 945.0
Mean 58.18 27.31 95.44635
Low 8.00 0.00
No. of Samples 36 303

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: ug/l Year
2012
Historical
period of record
High 1,040.0 3,092.0
Mean 666.12 783.45 400.28081
Low 443.00 70.00
No. of Samples 36 311

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: ug/l Year
2012
Historical
period of record
High 196.0 1,140.0
Mean 56.49 72.45 170.91858
Low 15.00 0.00
No. of Samples 36 260

Five-year Rolling Average

  • Annual Mean

Oysters

Units: Year
2012
Historical
period of record
High 449.0
Mean 60.38
Low 34.00
No. of Samples 2,067

Five-year Rolling Average

pH

Units: None Year
2012
Historical
period of record
High 8.5 8.5
Mean 7.25 7.69 0.33047
Low 6.17 5.58
No. of Samples 21 1,834

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2012
Historical
period of record
High 36.7 37.5
Mean 21.55 14.24 11.43366
Low 3.45 0.00
No. of Samples 21 2,264

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2012
Historical
period of record
High 55,333.0 55,333.0
Mean 34179.11 20020.91 16136.77435
Low 6379.00 8.083
No. of Samples 21 1,911

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2012
Historical
period of record
High 86.6 91.4
Mean 78.04 75.37 5.71858
Low 71.024 49.10
No. of Samples 14 1,808

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2012
Historical
period of record
High 5.6 18.0
Mean 3.33 3.6 2.17624
Low 2.20 1.30
No. of Samples 36 286

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 2011 128 107 235 46

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 Trend
Urban & Built-up 20,77358.1% 22,10961.8% 23,05164.4% 25,70071.8% 26,06672.9% 25,76872% Land Use Trend Sparkline
Agriculture 6,39817.9% 6,01816.8% 4,65713% 2,4987% 2,2166.2% 2,3096.5% Land Use Trend Sparkline
Rangeland 5231.5% 3080.9% 2620.7% 1420.4% 1470.4% 3300.9% Land Use Trend Sparkline
Upland Forests 3,3729.4% 2,6197.3% 2,3636.6% 1,9055.3% 1,7244.8% 1,7715% Land Use Trend Sparkline
Water 1,1713.3% 1,3673.8% 1,6064.5% 1,8585.2% 2,0275.7% 1,8835.3% Land Use Trend Sparkline
Wetlands 2,2736.4% 1,7624.9% 1,7354.8% 1,7154.8% 1,7274.8% 1,8605.2% Land Use Trend Sparkline
Barren Land 190.1% 1060.3% 6341.8% 90% 990.3% 950.3% 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% Land Use Trend Sparkline
Land Use Chart