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

3 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
2018
Historical
period of record
High 479.00 479.00
Mean 5.1021 3.9507 23.17345
Low 0.25 0.00
No. of Samples 120 2,292

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/L Year
2018
Historical
period of record
High 2.96 19.23
Mean 1.2556 1.1924 1.28996713
Low 0.66 0.144
No. of Samples 93 1,779

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/L Year
2018
Historical
period of record
High 1.30 3.455
Mean 0.4093 0.3897 0.31212935
Low 0.039 0.034
No. of Samples 115 2,545

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
2018
Historical
period of record
High 163.00 262.40
Mean 56.55 67.98 31.00698
Low 5.60 0.00
No. of Samples 120 3,504

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2018
Historical
period of record
High 8.72 21.30
Mean 1.67 1.17 1.73816
Low 1.00 0.071
No. of Samples 110 1,937

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2018
Historical
period of record
High 400.00 400.00
Mean 80.95 73.17 42.83618
Low 30.00 5.00
No. of Samples 120 1,275

Five-year Rolling Average

  • Annual Mean

Escherichia coli

Units: MPN/100ml Year
2018
Historical
period of record
High 12997.00 24196.00
Mean 1044.07 745.66 2895.8601
Low 41.00 10.00
No. of Samples 106 552

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2018
Historical
period of record
High 0.675 6.696
Mean 0.15 0.02 0.2275721
Low 0.012 0.00
No. of Samples 39 2,696

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2018
Historical
period of record
High 10.80 17.56
Mean 1.04 0.93 0.90837965
Low 0.40 0.002
No. of Samples 120 2,965

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2018
Historical
period of record
High 0.962 7.556
Mean 0.29 0.17 0.39156058
Low 0.01 0.00
No. of Samples 93 2,523

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2018
Historical
period of record
High 9.97 12.00
Mean 6.96 7.37 0.59056
Low 0.40 0.078
No. of Samples 240 3,975

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2018
Historical
period of record
High 31.60 31.60
Mean 0.29 0.31 1.22604
Low 0.10 0.00
No. of Samples 120 2,506

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2018
Historical
period of record
High 47745.30 51500.00
Mean 697.95 646.52 1747.1307
Low 219.60 0.475
No. of Samples 120 5,442

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2018
Historical
period of record
High 211.586 211.586
Mean 78.38 73.84 9.84599
Low 54.536 32.00
No. of Samples 120 4,183

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2018
Historical
period of record
High 112.00
Mean 4.3 6.90187
Low 0.091
No. of Samples 0 2,786

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
2018
Historical
period of record
High 23.8 99.1
Mean 10.1646 7.9237 9.47098
Low 2.08 0.25
No. of Samples 12 395

Five-year Rolling Average

  • Annual Mean

Nitrogen, Total

We were unable to determine a trend for the data available.
Units: mg/L Year
2018
Historical
period of record
High 1.8 3.4
Mean 1.2173 0.9048 0.50650475
Low 0.994 0.131
No. of Samples 7 233

Five-year Rolling Average

  • Annual Mean

Phosphorus, Total

We were unable to determine a trend for the data available.
Units: mg/L Year
2018
Historical
period of record
High 0.4 1.9
Mean 0.3037 0.2848 0.15886811
Low 0.218 0.084
No. of Samples 12 410

Five-year Rolling Average

  • Annual Mean
Caution

Dissolved Oxygen Saturation

Note: Low DO saturation also may be naturally influenced by inflows from nearby wetlands or groundwater sources
Score: Caution
Units: percent (%) Year
2018
Historical
period of record
High 97.0 210.0
Mean 42.25 61.92 25.52509
Low 1.10 1.10
No. of Samples 11 487

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2018
Historical
period of record
High 2.9 7.5
Mean 1.72 1.4 0.84317
Low 1.00 0.50
No. of Samples 11 345

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2018
Historical
period of record
High 120.0 280.0
Mean 58.22 53.27 40.11929
Low 30.00 15.00
No. of Samples 12 150

Five-year Rolling Average

  • Annual Mean

Enterococcus Group Bacteria

Units: MPN/100ml Year
2018
Historical
period of record
High 41,000.0 41,000.0
Mean 714.52 626.72 6536.87965
Low 40.00 10.00
No. of Samples 12 39

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2018
Historical
period of record
High 0.2 0.9
Mean 0.09 0.03 0.08095648
Low 0.031 0.00
No. of Samples 3 452

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2018
Historical
period of record
High 1.2 3.1
Mean 0.8 0.8 0.35690358
Low 0.571 0.07
No. of Samples 12 457

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2018
Historical
period of record
High 0.7 1.1
Mean 0.27 0.08 0.14654408
Low 0.105 0.00
No. of Samples 7 410

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2018
Historical
period of record
High 8.4 8.5
Mean 7.54 7.66 0.34824
Low 6.50 5.58
No. of Samples 23 2,021

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2018
Historical
period of record
High 27.0 37.5
Mean 5.14 13.84 11.41097
Low 0.30 0.00
No. of Samples 11 2,412

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2018
Historical
period of record
High 41,597.5 55,333.0
Mean 3407.77 19648.07 16137.08279
Low 0.30 0.30
No. of Samples 11 2,055

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2018
Historical
period of record
High 211.6 211.6
Mean 84.71 75.43 6.6567
Low 65.534 49.10
No. of Samples 11 1,928

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2018
Historical
period of record
High 21.0
Mean 3.99 2.65602
Low 1.30
No. of Samples 0 445

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 2017 45 40 85 47

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