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
2017
Historical
period of record
High 252.00 332.00
Mean 4.8991 4.1347 17.70677
Low 0.347 0.00
No. of Samples 226 2,553

Five-year Rolling Average

  • Annual Mean
Pass

Nitrogen, Total

Score: Pass
Units: mg/L Year
2017
Historical
period of record
High 13.668 19.23
Mean 1.3921 1.2578 1.59916658
Low 0.59 0.144
No. of Samples 162 1,982

Five-year Rolling Average

  • Annual Mean
Pass

Phosphorus, Total

Score: Pass
Units: mg/L Year
2017
Historical
period of record
High 2.01 7.36
Mean 0.3951 0.4087 0.38206052
Low 0.047 0.034
No. of Samples 214 2,935

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
2017
Historical
period of record
High 165.00 262.40
Mean 55.32 69.45 32.12624
Low 0.10 0.00
No. of Samples 174 3,715

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2017
Historical
period of record
High 9.01 21.30
Mean 1.39 1.24 1.83469
Low 1.00 0.071
No. of Samples 195 2,218

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2017
Historical
period of record
High 300.00 400.00
Mean 78.14 69.36 42.77909
Low 20.00 0.00
No. of Samples 216 1,437

Five-year Rolling Average

  • Annual Mean

Escherichia coli

Units: MPN/100ml Year
2017
Historical
period of record
High 24196.00 24196.00
Mean 644.26 682.63 2903.06263
Low 10.00 10.00
No. of Samples 202 567

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2017
Historical
period of record
High 15.80 16.80
Mean 0.17 0.03 0.94116907
Low 0.005 0.00
No. of Samples 91 3,045

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2017
Historical
period of record
High 20.60 20.60
Mean 1.19 0.95 1.2766864
Low 0.482 0.002
No. of Samples 221 3,299

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2017
Historical
period of record
High 1.21 7.556
Mean 0.17 0.17 0.40458433
Low 0.01 0.00
No. of Samples 160 2,813

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2017
Historical
period of record
High 10.70 12.00
Mean 7.41 7.43 0.43631
Low 1.40 1.40
No. of Samples 398 4,350

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2017
Historical
period of record
High 15.90 22.90
Mean 0.3 0.31 0.91584
Low 0.10 0.00
No. of Samples 176 2,681

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2017
Historical
period of record
High 25780.40 51500.00
Mean 705.08 598.61 1702.66572
Low 5.30 0.369
No. of Samples 187 4,490

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2017
Historical
period of record
High 89.96 139.46
Mean 74.2 72.92 8.34365
Low 57.20 46.40
No. of Samples 182 3,257

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2017
Historical
period of record
High 240.00 240.00
Mean 4.7 4.25 9.72389
Low 0.38 0.091
No. of Samples 199 3,165

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
2017
Historical
period of record
High 15.8 99.1
Mean 7.3803 7.8621 9.57702
Low 3.56 0.25
No. of Samples 13 383

Five-year Rolling Average

  • Annual Mean

Nitrogen, Total

We were unable to determine a trend for the data available.
Units: mg/L Year
2017
Historical
period of record
High 1.4 8.9
Mean 1.0774 1.0243 1.34550273
Low 0.699 0.131
No. of Samples 10 256

Five-year Rolling Average

  • Annual Mean

Phosphorus, Total

We were unable to determine a trend for the data available.
Units: mg/L Year
2017
Historical
period of record
High 0.6 2.2
Mean 0.3629 0.3008 0.21997513
Low 0.269 0.084
No. of Samples 13 428

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
2017
Historical
period of record
High 79.0 210.0
Mean 50.58 62.47 25.52567
Low 32.10 8.6027
No. of Samples 8 476

Five-year Rolling Average

  • Annual Mean

BOD, Biochemical oxygen demand

Units: mg/l Year
2017
Historical
period of record
High 2.0 7.5
Mean 1.38 1.39 0.8434
Low 1.00 0.50
No. of Samples 12 334

Five-year Rolling Average

  • Annual Mean

Color

Units: PCU Year
2017
Historical
period of record
High 100.0 280.0
Mean 60.66 53.16 41.20416
Low 20.00 15.00
No. of Samples 13 142

Five-year Rolling Average

  • Annual Mean

Enterococcus Group Bacteria

Units: MPN/100ml Year
2017
Historical
period of record
High 7,400.0 7,400.0
Mean 528.45 591.24 1648.67857
Low 10.00 10.00
No. of Samples 12 27

Five-year Rolling Average

  • Annual Mean

Nitrogen, Ammonia + Ammonium as N

Units: mg/L Year
2017
Historical
period of record
High 0.2 0.9
Mean 0.15 0.03 0.08183127
Low 0.10 0.00
No. of Samples 5 464

Five-year Rolling Average

  • Annual Mean

Nitrogen, Kjeldahl

Units: mg/L Year
2017
Historical
period of record
High 1.1 3.1
Mean 0.88 0.81 0.35569676
Low 0.621 0.07
No. of Samples 13 473

Five-year Rolling Average

  • Annual Mean

Nitrogen, Nitrite + Nitrate as N

Units: mg/L Year
2017
Historical
period of record
High 0.4 1.1
Mean 0.14 0.08 0.14781624
Low 0.014 0.00
No. of Samples 10 418

Five-year Rolling Average

  • Annual Mean

pH

Units: None Year
2017
Historical
period of record
High 7.8 8.5
Mean 7.5 7.66 0.34803
Low 7.10 5.58
No. of Samples 21 2,015

Five-year Rolling Average

  • Annual Mean

Salinity

Units: PSS Year
2017
Historical
period of record
High 33.1 37.5
Mean 7.39 13.9 11.40788
Low 0.20 0.00
No. of Samples 8 2,401

Five-year Rolling Average

  • Annual Mean

Specific conductance

Units: umho Year
2017
Historical
period of record
High 49,866.7 55,333.0
Mean 12857.09 19432.32 16226.26647
Low 501.10 8.083
No. of Samples 8 2,061

Five-year Rolling Average

  • Annual Mean

Temperature, water

Units: deg F Year
2017
Historical
period of record
High 89.1 91.4
Mean 72.04 75.4 5.90571
Low 51.80 49.10
No. of Samples 8 1,932

Five-year Rolling Average

  • Annual Mean

Turbidity

Units: NTU Year
2017
Historical
period of record
High 8.7 21.0
Mean 4.23 3.99 2.65602
Low 2.90 1.30
No. of Samples 11 445

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