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

4 out of 4 primary indicators were rated as PASS.

"Primary" are nutrient related (Chl, N, P) and bacteria (B) parameters.

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

Greyed out values indicate no data for the report year.

  • 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

Water Chemistry Ratings

Monitoring data is analyzed to determine stream health based on State water quality standards. Official determination of impairment or attainment of the water quality standards is performed by FDEP and is based on at least three years and up to seven and a half years of data. Information on approximately 17 different parameters are collected at stream sites, but only total nitrogen, total phosphorus, chlorophyll a, dissolved oxygen (percent saturation), and bacteria are assessed according to established water quality criteria mandated by the Clean Water Act. Additionally, the floral and faunal communities (SCI) are assessed at some sites to determine whether waters support a healthy aquatic community.

The "pass/fail" conditions presented here do not indicate impairment as determined by the official Florida Department of Environmental Protection Impaired Waters Rule assessment but, rather, give an indication of stream condition in a particular year in relation to the set regulatory numeric limits. Streams receive an annual "PASS" rating for each parameter if the mean value is below the regulatory value and a "FAIL" rating if the mean value exceeds the regulatory value. Not all water quality parameters have an established numeric criterion, so only some of the graphs below show the regulatory limit, represented by a horizontal red line.

Chart Legend
  • Monthly Average
  • Threshold
  • Annual Mean

The graphs here illustrate results over the past five years. Data from sites monitored within a single waterbody identification basin (WBID) are combined to determine water quality status for each WBID, and the annual geometric mean of sample results is indicated on the graph for the most recent year. The table to the left of the graph gives the annual and historic range of values for the indicator.

Click the graph to view a larger image and to download the full dataset.

Freshwater Portion of the Creek

Data for the following WBIDs is averaged when compiling the data below:
  • 1937
  • 1941
  • 1966
  • 1971
  • 1971A

Chlorophyll a

Units: µg/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
  • Monthly Average
  • NNC 20.00 µg/l
  • Annual Mean

Nitrogen, Total

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
  • Monthly Average
  • NNC 1.65 mg/L
  • Annual Mean

Phosphorus, Total

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
  • Monthly Average
  • NNC 0.49 mg/L
  • Annual Mean

Dissolved Oxygen Saturation

Note: Dissolved oxygen saturation percentages above the regulatory threshold meet established water quality targets.
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
  • Monthly Average
  • NNC 38.00 percent (%)
  • 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly Average
  • Annual Mean

Specific conductance

Units: µmho 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
  • Monthly Average
  • Annual Mean

Temperature, water

Units: °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
  • Monthly 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
  • Monthly Average
  • Annual Mean
Other Measures of Creek Health:

Tidal Portion of the Creek

Data for the following WBIDs is averaged when compiling the data below:
  • 1947
  • 1968D
Pass

Chlorophyll a

Score: Pass
Units: µg/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
  • Monthly Average
  • NNC 11.00 ug/l
  • 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
  • Monthly 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
  • Monthly Average
  • Annual Mean
Pass

Dissolved Oxygen Saturation

Note: Dissolved oxygen saturation percentages above the regulatory threshold meet established water quality targets.
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
  • Monthly Average
  • NNC 56.00 percent (%)
  • 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly 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
  • Monthly Average
  • Annual Mean

Specific conductance

Units: µmho 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
  • Monthly Average
  • Annual Mean

Temperature, water

Units: °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
  • Monthly 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
  • Monthly 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 2023 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% 27,35676.5% 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% 9902.8% Land Use Trend Sparkline
Rangeland 5231.5% 3080.9% 2620.7% 1420.4% 1470.4% 3300.9% 1290.4% 1290.4% 1380.4% 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% 1,3883.9% 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% 2,1386% 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% 1,8375.1% Land Use Trend Sparkline
Barren Land 190.1% 1060.3% 6341.8% 90% 990.3% 950.3% 1000.3% 650.2% 620.2% 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% 1,8655.2% Land Use Trend Sparkline
Land Use Chart