Skip Navigation LinksHomeBay Conditions OverviewBay Condition Report

Sarasota Bay Condition Report for 2016

View 2015 Report

Caution

2 out of 3 indicators were rated as PASS.

All three indicators must pass
for the bay to be rated as PASS.

Learn more about how this report is created

Summary:

The overall health in Sarasota Bay degraded slightly in 2016, changing from the previous year. Chlorophyll a showed a clear increase, while phosphorus and nitrogen slightly decreased.

Water Quality: Two of the three water quality indicators (nitrogen and phosphorus) were rated as excellent (below their respective targets). However, chlorophyll a exceeded the target and threshold values. The mean for chlorophyll a was calculated as an arithmetic mean and the means for nitrogen and phosphorus were calculated as geometric means (per the Numeric Nutrient Criteria outlined in the Florida Administrative Code, section 62-302.532). Mean chlorophyll a concentration was 0.0067 mg/l, above the target value of 0.0052 mg/l and the threshold of 0.0061 mg/l. The mean concentration of total nitrogen decreased marginall6 to 0.3528 mg/l, still below its target value of 0.51 mg/l . Mean total phosphorus concentration increased marginally, but at 0.0639 mg/l was still well below its target value of 0.150 mg/l.

Biotic Indicator: A survey of the biotic indicator, seagrass, was performed in 2016 by the Southwest Florida Water Management District. In 2016, the total area of seagrass in the lower portion of Sarasota Bay (the area within Sarasota County) was estimated to be 3,639 acres, well above the target of 2,022 acres.

Bay Location Map

Bays included in this report:

Water Chemistry Ratings

Total nitrogen, total phosphorus, and chlorophyll a levels are monitored carefully by water resource managers and used by regulatory authorities to determine whether a bay meets the water quality standards mandated by the Clean Water Act. The trend graphs for these indicators are shown below, along with their target and threshold values. A target value is a desirable goal to be attained, while a threshold is an undesirable level which is to be avoided. Learn More about these ratings and how they are calculated »

The Five-year Trend Graphs below illustrate the general trend of water quality parameters. They show a six-month running average, which moderates high and low values in the data.

Caution

Chlorophyll a

Score: Caution How was this determined?
Units: mg/l Year
2016
Historical
period of record
High 0.0434 0.049
Mean 0.0067 0.0049 0.00410942 0.0052000000
Low 0.0016 0.0002
No. of Samples 199 5,065

Five-year Trend Graph

     
1/1/20123.46250.0034600mg/l
2/1/20123.90270.0036800mg/l
3/1/20124.00210.0037900mg/l
4/1/20122.92290.0035700mg/l
5/1/20122.63210.0033800mg/l
6/1/20129.08310.0043300mg/l
7/1/20124.61250.0045200mg/l
8/1/20128.95270.0053700mg/l
9/1/20126.11260.0057200mg/l
10/1/20124.79250.0060300mg/l
11/1/20123.82260.0062300mg/l
12/1/20123.92210.0053700mg/l
1/1/20134.18290.0053000mg/l
2/1/20132.26270.0041800mg/l
3/1/20134.28210.0038800mg/l
4/1/20134.17310.0037700mg/l
5/1/20133.97260.0038000mg/l
6/1/20136.59270.0042400mg/l
7/1/20134.04260.0042200mg/l
8/1/20136.05250.0048500mg/l
9/1/20135.21210.0050100mg/l
10/1/20136.48300.0053900mg/l
11/1/20134.10210.0054100mg/l
12/1/20133.74300.0049400mg/l
1/1/20142.92210.0047500mg/l
2/1/20142.26300.0041200mg/l
3/1/20142.41250.0036500mg/l
4/1/20143.68260.0031900mg/l
5/1/20143.19210.0030300mg/l
6/1/20145.06300.0032500mg/l
7/1/20148.92250.0042500mg/l
8/1/20145.01210.0047100mg/l
9/1/20147.33210.0055300mg/l
10/1/20144.65350.0056900mg/l
11/1/20143.27260.0057100mg/l
12/1/20146.35270.0059200mg/l
1/1/20154.11280.0051200mg/l
2/1/20153.10220.0048000mg/l
3/1/20151.80320.0038800mg/l
4/1/20153.29250.0036500mg/l
5/1/20153.26280.0036500mg/l
6/1/20154.61270.0033600mg/l
7/1/20155.74280.0036300mg/l
8/1/20155.17270.0039800mg/l
9/1/20156.10170.0047000mg/l
10/1/20155.00250.0049800mg/l
11/1/20158.30230.0058200mg/l
12/1/20158.98160.0065500mg/l
1/1/20166.84170.0067300mg/l
2/1/20164.62160.0066400mg/l
3/1/20163.32170.0061800mg/l
4/1/20164.32160.0060600mg/l
5/1/20163.22170.0052200mg/l
6/1/20168.46160.0051300mg/l
7/1/20166.95170.0051500mg/l
8/1/20163.92160.0050300mg/l
9/1/20169.92170.0061300mg/l
10/1/201610.69160.0071900mg/l
11/1/20166.72170.0077800mg/l
12/1/201611.64160.0083100mg/l
Loading Chart...
Target
0.0052 mg/l
Threshold
0.0061 mg/l
Excellent

Nitrogen, Total

Score: Excellent How was this determined?
Units: mg/l Year
2016
Historical
period of record
High 0.695 1.87
Mean 0.3528 0.3381 0.17632316 0.5100000000
Low 0.195 0.03
No. of Samples 198 4,862

Five-year Trend Graph

     
1/1/2012363.00250.3630000mg/l
2/1/2012420.96260.3919800mg/l
3/1/2012446.43210.4101300mg/l
4/1/2012502.59290.4332500mg/l
5/1/2012293.57210.4053100mg/l
6/1/2012436.50300.4105100mg/l
7/1/2012312.20250.4020400mg/l
8/1/2012393.46260.3974600mg/l
9/1/2012377.40250.3859500mg/l
10/1/2012425.80250.3731600mg/l
11/1/2012380.73260.3876800mg/l
12/1/2012251.52210.3568500mg/l
1/1/2013350.52290.3632400mg/l
2/1/2013271.73260.3429500mg/l
3/1/2013256.43210.3227900mg/l
4/1/2013367.07290.3130000mg/l
5/1/2013424.42260.3202800mg/l
6/1/2013415.40250.3476000mg/l
7/1/2013394.60250.3549400mg/l
8/1/2013487.40250.3908900mg/l
9/1/2013522.14210.4351700mg/l
10/1/2013411.17300.4425200mg/l
11/1/2013505.19210.4559800mg/l
12/1/2013343.83300.4440600mg/l
1/1/2014366.90210.4394400mg/l
2/1/2014415.17300.4274000mg/l
3/1/2014382.20250.4040800mg/l
4/1/2014321.96250.3892100mg/l
5/1/2014370.71210.3668000mg/l
6/1/2014456.17300.3855200mg/l
7/1/2014422.20250.3947400mg/l
8/1/2014509.29210.4104200mg/l
9/1/2014557.86210.4397000mg/l
10/1/2014421.32340.4562600mg/l
11/1/2014439.50260.4677200mg/l
12/1/2014461.92260.4686800mg/l
1/1/2015399.30270.4648700mg/l
2/1/2015354.09220.4390000mg/l
3/1/2015388.28320.4107400mg/l
4/1/2015314.05210.3928600mg/l
5/1/2015397.41270.3858400mg/l
6/1/2015422.31260.3792400mg/l
7/1/2015465.37270.3902500mg/l
8/1/2015427.50260.4024900mg/l
9/1/2015362.06170.3981200mg/l
10/1/2015367.54240.4070300mg/l
11/1/2015432.35170.4128600mg/l
12/1/2015447.50160.4170500mg/l
1/1/2016385.76170.4037900mg/l
2/1/2016361.25160.3927400mg/l
3/1/2016297.94170.3820600mg/l
4/1/2016410.63160.3892400mg/l
5/1/2016319.71170.3704700mg/l
6/1/2016376.31160.3586000mg/l
7/1/2016367.35170.3555300mg/l
8/1/2016333.13160.3508500mg/l
9/1/2016347.35170.3590800mg/l
10/1/2016423.94160.3613000mg/l
11/1/2016350.59170.3664500mg/l
12/1/2016393.25160.3692700mg/l
Loading Chart...
Target
0.51 mg/l
Threshold
0.822 mg/l
Targets and thresholds shown on this graph are advisory approximations computed by Sarasota County using recent data. Regulatory thresholds have not been established. Learn more about Sarasota Bay Nitrogen targets/thresholds »
Excellent

Phosphorus, Total

Score: Excellent How was this determined?
Units: mg/l Year
2016
Historical
period of record
High 0.22 4.40
Mean 0.064 0.0851 0.13215902 0.1500000000
Low 0.05 0.002
No. of Samples 199 4,988

Five-year Trend Graph

     
1/1/201269.60250.0696000mg/l
2/1/201259.78270.0646900mg/l
3/1/201252.86210.0607500mg/l
4/1/2012143.10290.0813400mg/l
5/1/201250.48210.0751600mg/l
6/1/201266.90310.0737900mg/l
7/1/201261.04250.0723600mg/l
8/1/201265.54260.0733200mg/l
9/1/2012102.77260.0816400mg/l
10/1/201284.00250.0717900mg/l
11/1/201256.92260.0728600mg/l
12/1/201264.29210.0724300mg/l
1/1/201351.66290.0708600mg/l
2/1/201351.54260.0685300mg/l
3/1/201374.76210.0638600mg/l
4/1/201394.58310.0656300mg/l
5/1/201351.92260.0647900mg/l
6/1/201356.96250.0635700mg/l
7/1/201358.96250.0647900mg/l
8/1/201355.12250.0653800mg/l
9/1/201359.05210.0627700mg/l
10/1/201353.47300.0559100mg/l
11/1/201352.86210.0560700mg/l
12/1/2013110.93300.0650700mg/l
1/1/201453.33210.0641300mg/l
2/1/201452.13300.0636300mg/l
3/1/201452.96250.0626100mg/l
4/1/201454.16250.0627300mg/l
5/1/201462.38210.0643200mg/l
6/1/201460.80300.0559600mg/l
7/1/201474.96250.0595700mg/l
8/1/201460.95210.0610400mg/l
9/1/201464.76210.0630000mg/l
10/1/201467.00340.0651400mg/l
11/1/201460.00260.0647500mg/l
12/1/201450.92260.0631000mg/l
1/1/201587.64280.0652100mg/l
2/1/201580.91220.0685400mg/l
3/1/2015102.81320.0748800mg/l
4/1/201580.32250.0771000mg/l
5/1/201573.93280.0794200mg/l
6/1/201551.31260.0794900mg/l
7/1/201560.89270.0750300mg/l
8/1/201559.23260.0714200mg/l
9/1/201554.12170.0633000mg/l
10/1/2015327.60250.1045100mg/l
11/1/201577.45220.1051000mg/l
12/1/201578.75160.1096700mg/l
1/1/201678.24170.1125700mg/l
2/1/201658.75160.1124900mg/l
3/1/201656.47170.1128800mg/l
4/1/201667.50160.0695300mg/l
5/1/201658.24170.0663300mg/l
6/1/201661.25160.0634100mg/l
7/1/201666.47170.0614500mg/l
8/1/201660.00160.0616600mg/l
9/1/201664.12170.0629300mg/l
10/1/201693.75160.0673100mg/l
11/1/201680.59170.0710300mg/l
12/1/201668.75160.0722800mg/l
Loading Chart...
Target
0.15 mg/l
Threshold
0.19 mg/l

Dissolved Oxygen

Units: mg/l Year
2016
Historical
period of record
High 12.30 13.80
Mean 7.75 6.7 1.46892
Low 4.40 0.10
No. of Samples 358 16,519

Five-year Trend Graph

     
1/1/20128.66248.6600000mg/l
2/1/20127.15257.9100000mg/l
3/1/20127.48267.7600000mg/l
4/1/20127.43567.6800000mg/l
5/1/20125.59527.2600000mg/l
6/1/20126.64297.1600000mg/l
7/1/20126.06246.7300000mg/l
8/1/20125.86266.5100000mg/l
9/1/20126.12256.2800000mg/l
10/1/20126.02246.0500000mg/l
11/1/20126.79266.2500000mg/l
12/1/20127.03206.3100000mg/l
1/1/20137.30286.5200000mg/l
2/1/20137.96256.8700000mg/l
3/1/20136.65516.9600000mg/l
4/1/20137.46287.2000000mg/l
5/1/20136.36257.1300000mg/l
6/1/20135.45746.8600000mg/l
7/1/20136.00246.6500000mg/l
8/1/20135.76246.2800000mg/l
9/1/20136.09206.1900000mg/l
10/1/20136.74346.0700000mg/l
11/1/20136.59216.1100000mg/l
12/1/20137.55296.4600000mg/l
1/1/20147.06206.6300000mg/l
2/1/20147.91296.9900000mg/l
3/1/20147.32247.2000000mg/l
4/1/20147.13257.2600000mg/l
5/1/20146.91207.3100000mg/l
6/1/20146.33297.1100000mg/l
7/1/20145.70246.8800000mg/l
8/1/20144.55206.3200000mg/l
9/1/20145.71206.0600000mg/l
10/1/20146.58335.9600000mg/l
11/1/20147.31256.0300000mg/l
12/1/20146.89256.1200000mg/l
1/1/20156.89256.3200000mg/l
2/1/20157.76206.8600000mg/l
3/1/20157.91307.2200000mg/l
4/1/20158.05247.4700000mg/l
5/1/20156.68257.3600000mg/l
6/1/20156.40257.2800000mg/l
7/1/20155.79257.1000000mg/l
8/1/20156.84256.9500000mg/l
9/1/20155.91156.6100000mg/l
10/1/20156.50236.3500000mg/l
11/1/20156.97216.4000000mg/l
12/1/20157.61156.6000000mg/l
1/1/20167.85156.9500000mg/l
2/1/20168.03157.1500000mg/l
3/1/20167.30157.3800000mg/l
4/1/20167.25157.5000000mg/l
5/1/20166.90157.4900000mg/l
6/1/20166.26157.2700000mg/l
7/1/20166.17156.9900000mg/l
8/1/20165.92156.6300000mg/l
9/1/20167.01156.5900000mg/l
10/1/20165.28156.2600000mg/l
11/1/20166.34156.1600000mg/l
12/1/20166.45156.2000000mg/l
Loading Chart...
Target
mg/l
Threshold
0.00 mg/l

Light Attenuation

Units: K(1/m) Year
2016
Historical
period of record
High 4.02 5.68
Mean 0.74 0.69 0.31793
Low 0.20 0.05
No. of Samples 169 3,958

Five-year Trend Graph

     
1/1/20120.69240.6900000K(1/m)
2/1/20120.66260.6800000K(1/m)
3/1/20120.70200.6800000K(1/m)
4/1/20120.61270.6700000K(1/m)
5/1/20120.48200.6300000K(1/m)
6/1/20120.69300.6400000K(1/m)
7/1/20120.70240.6400000K(1/m)
8/1/20120.63260.6400000K(1/m)
9/1/20120.86250.6600000K(1/m)
10/1/20120.74240.6800000K(1/m)
11/1/20120.76260.7300000K(1/m)
12/1/20120.91200.7700000K(1/m)
1/1/20130.67200.7600000K(1/m)
2/1/20130.69260.7700000K(1/m)
3/1/20130.68200.7400000K(1/m)
4/1/20130.45200.6900000K(1/m)
5/1/20130.61200.6700000K(1/m)
6/1/20130.69250.6300000K(1/m)
7/1/20130.64240.6300000K(1/m)
8/1/20130.57240.6100000K(1/m)
9/1/20130.82200.6300000K(1/m)
10/1/20130.76290.6800000K(1/m)
11/1/20130.67200.6900000K(1/m)
12/1/20130.62280.6800000K(1/m)
1/1/20140.54200.6600000K(1/m)
2/1/20140.70300.6900000K(1/m)
3/1/20140.52240.6400000K(1/m)
4/1/20140.72200.6300000K(1/m)
5/1/20140.49200.6000000K(1/m)
6/1/20140.65290.6000000K(1/m)
7/1/20140.58200.6100000K(1/m)
8/1/20140.56200.5900000K(1/m)
9/1/20140.60200.6000000K(1/m)
10/1/20140.68340.5900000K(1/m)
11/1/20140.87250.6600000K(1/m)
12/1/20140.91200.7000000K(1/m)
1/1/20150.75200.7300000K(1/m)
2/1/20150.95200.7900000K(1/m)
3/1/20150.64200.8000000K(1/m)
4/1/20150.67240.8000000K(1/m)
5/1/20150.44260.7300000K(1/m)
6/1/20150.59250.6700000K(1/m)
7/1/20150.81250.6800000K(1/m)
8/1/20150.77260.6500000K(1/m)
9/1/20150.60150.6500000K(1/m)
10/1/20150.68240.6500000K(1/m)
11/1/20150.78210.7100000K(1/m)
12/1/20150.67150.7200000K(1/m)
1/1/20160.69150.7000000K(1/m)
2/1/20160.78150.7000000K(1/m)
3/1/20160.74150.7200000K(1/m)
4/1/20160.91150.7600000K(1/m)
5/1/20160.42150.7000000K(1/m)
6/1/20160.63150.7000000K(1/m)
7/1/20160.56150.6700000K(1/m)
8/1/20160.64150.6500000K(1/m)
9/1/20161.50110.7800000K(1/m)
10/1/20160.87150.7700000K(1/m)
11/1/20160.62130.8000000K(1/m)
12/1/20160.70100.8200000K(1/m)
Loading Chart...
Target
K(1/m)
Threshold
0.00 K(1/m)

Rainfall

Units: inches/yr Year
2016
Historical
period of record
High 43.98 56.04
Mean 36.41 14.1534945205365
Low 8.12
No. of Samples 366 4,767

Five-year Trend Graph

     
1/1/20120.55290.5500000inches
2/1/20120.63290.6300000inches
3/1/20121.70311.7000000inches
4/1/20122.62242.6200000inches
5/1/20121.33311.3300000inches
6/1/201217.533017.5300000inches
7/1/20123.21313.2100000inches
8/1/20125.79315.7900000inches
9/1/20123.02303.0200000inches
10/1/20124.14314.1400000inches
11/1/20120.00280.0000000inches
12/1/20121.22311.2200000inches
1/1/20130.13310.1300000inches
2/1/20131.10231.1000000inches
3/1/20131.38311.3800000inches
4/1/20133.42303.4200000inches
5/1/20133.31313.3100000inches
6/1/201312.213012.2100000inches
7/1/20138.36318.3600000inches
8/1/201312.313112.3100000inches
9/1/201311.613011.6100000inches
10/1/20131.19311.1900000inches
11/1/20130.85300.8500000inches
12/1/20130.17310.1700000inches
1/1/20142.20312.2000000inches
2/1/20143.14283.1400000inches
3/1/20145.04315.0400000inches
4/1/20141.48291.4800000inches
5/1/20146.43316.4300000inches
6/1/20143.64303.6400000inches
7/1/20144.83314.8300000inches
8/1/20141.73281.7300000inches
9/1/20147.33257.3300000inches
10/1/20142.34292.3400000inches
11/1/20143.76303.7600000inches
12/1/20140.38310.3800000inches
1/1/20151.26311.2600000inches
2/1/20153.59283.5900000inches
3/1/20151.13311.1300000inches
4/1/20151.14301.1400000inches
5/1/20153.68313.6800000inches
6/1/20155.92305.9200000inches
7/1/201510.803110.8000000inches
8/1/20156.46316.4600000inches
9/1/20157.54307.5400000inches
10/1/20153.25313.2500000inches
11/1/20150.73300.7300000inches
12/1/20152.12312.1200000inches
1/1/20165.73315.7300000inches
2/1/20161.92291.9200000inches
3/1/20162.51312.5100000inches
4/1/20160.46300.4600000inches
5/1/20164.97314.9700000inches
6/1/20167.23307.2300000inches
7/1/20163.77313.7700000inches
8/1/201610.663110.6600000inches
9/1/20164.03304.0300000inches
10/1/20162.33312.3300000inches
11/1/20160.04300.0400000inches
12/1/20160.33310.3300000inches
Loading Chart...
Target
inches/yr
Threshold
inches/yr

Salinity

Units: PSS Year
2016
Historical
period of record
High 38.90 68.20
Mean 33.84 33.26 2.39378
Low 18.80 3.60
No. of Samples 350 18,026

Five-year Trend Graph

     
1/1/201234.732434.7300000PSS
2/1/201234.922634.8300000PSS
3/1/201235.522635.0600000PSS
4/1/201236.215535.3500000PSS
5/1/201235.595235.3900000PSS
6/1/201230.762934.6200000PSS
7/1/201233.922434.4900000PSS
8/1/201233.942534.3200000PSS
9/1/201234.042534.0800000PSS
10/1/201234.252433.7500000PSS
11/1/201233.562533.4100000PSS
12/1/201234.312034.0000000PSS
1/1/201333.592833.9500000PSS
2/1/201334.802534.0900000PSS
3/1/201334.842034.2300000PSS
4/1/201330.692833.6300000PSS
5/1/201335.162533.9000000PSS
6/1/201335.507334.1000000PSS
7/1/201332.052433.8400000PSS
8/1/201332.382433.4400000PSS
9/1/201330.402032.7000000PSS
10/1/201333.614833.1800000PSS
11/1/201333.072032.8400000PSS
12/1/201333.222932.4600000PSS
1/1/201433.352032.6700000PSS
2/1/201432.992932.7700000PSS
3/1/201433.832433.3500000PSS
4/1/201433.182533.2700000PSS
5/1/201432.992033.2600000PSS
6/1/201435.042933.5600000PSS
7/1/201435.462533.9200000PSS
8/1/201435.672034.3600000PSS
9/1/201435.622034.6600000PSS
10/1/201432.583334.5600000PSS
11/1/201433.382534.6300000PSS
12/1/201432.352534.1800000PSS
1/1/201532.662433.7100000PSS
2/1/201533.572033.3600000PSS
3/1/201532.432932.8300000PSS
4/1/201533.662433.0100000PSS
5/1/201535.112533.3000000PSS
6/1/201535.042533.7500000PSS
7/1/201535.592534.2300000PSS
8/1/201531.942533.9600000PSS
9/1/201531.541533.8100000PSS
10/1/201534.012433.8700000PSS
11/1/201533.992033.6900000PSS
12/1/201533.511533.4300000PSS
1/1/201634.251533.2100000PSS
2/1/201632.161533.2400000PSS
3/1/201633.011533.4900000PSS
4/1/201633.781533.4500000PSS
5/1/201634.861533.6000000PSS
6/1/201632.651533.4500000PSS
7/1/201634.721533.5300000PSS
8/1/201634.661533.9500000PSS
9/1/201629.721533.4000000PSS
10/1/201628.171532.4600000PSS
11/1/201633.561532.2500000PSS
12/1/201633.381532.3700000PSS
Loading Chart...

Turbidity

Units: NTU Year
2016
Historical
period of record
High 14.00 39.00
Mean 3.17 2.63 2.44935
Low 0.55 0.03
No. of Samples 199 14,572

Five-year Trend Graph

     
1/1/20122.88252.8800000NTU
2/1/20123.27273.0800000NTU
3/1/20124.04243.4000000NTU
4/1/20122.52293.1800000NTU
5/1/20122.34213.0100000NTU
6/1/20123.23313.0500000NTU
7/1/20123.19253.1000000NTU
8/1/20122.17272.9200000NTU
9/1/20123.51262.8300000NTU
10/1/20123.32252.9600000NTU
11/1/20121.96272.9000000NTU
12/1/20123.03212.8600000NTU
1/1/20133.50292.9200000NTU
2/1/20133.16273.0800000NTU
3/1/20135.23213.3700000NTU
4/1/20132.57303.2400000NTU
5/1/20133.20263.4500000NTU
6/1/20132.63253.3800000NTU
7/1/20132.06253.1400000NTU
8/1/20131.95252.9400000NTU
9/1/20132.30212.4500000NTU
10/1/20131.91302.3400000NTU
11/1/20133.28212.3600000NTU
12/1/20132.15302.2800000NTU
1/1/20143.33212.4900000NTU
2/1/20141.40312.4000000NTU
3/1/20141.84252.3200000NTU
4/1/20144.31262.7200000NTU
5/1/20142.50212.5900000NTU
6/1/20141.95302.5600000NTU
7/1/20142.19252.3700000NTU
8/1/20142.62212.5700000NTU
9/1/20142.99212.7600000NTU
10/1/20142.19342.4100000NTU
11/1/20141.91262.3100000NTU
12/1/20144.03262.6600000NTU
1/1/20153.02282.7900000NTU
2/1/20156.85223.5000000NTU
3/1/20152.44333.4100000NTU
4/1/20152.70253.4900000NTU
5/1/20152.26283.5500000NTU
6/1/20152.27273.2600000NTU
7/1/20152.80283.2200000NTU
8/1/20152.00272.4100000NTU
9/1/20152.07172.3500000NTU
10/1/20151.84252.2100000NTU
11/1/20152.28222.2100000NTU
12/1/20152.04162.1700000NTU
1/1/20162.58172.1400000NTU
2/1/20164.95162.6300000NTU
3/1/20165.36173.1800000NTU
4/1/20166.67163.9800000NTU
5/1/20162.08173.9500000NTU
6/1/20164.15164.3000000NTU
7/1/20162.66174.3100000NTU
8/1/20162.24163.8600000NTU
9/1/20161.89173.2800000NTU
10/1/20161.94162.4900000NTU
11/1/20161.99172.4800000NTU
12/1/20161.79162.0900000NTU
Loading Chart...

Other Measures of Bay Health

In addition to nutrient levels and chlorophyll concentration, dissolved oxygen levels, and water clarity are also objective indicators of bay health. These have complex interactive cycles which are affected by rainfall, temperature, and tidal action, as well as other factors. High nutrient levels (nitrogen and phosphorus) can stimulate excessive growth of marine algae (indicated by chlorophyll a level), resulting in reduced water clarity (and increased light attenuation) and depleted oxygen levels. Both plants and animals in a bay need oxygen to survive, and the seagrasses which provide food and cover for bay creatures need light for photosynthesis.

Bay Contour Maps (2016)

Contour mapping is one of the best ways to visualize spatial differences in coastal water quality. The interactive map shown below presents monthly data for one selected water quality indicator atop an aerial view of the bay. Choose a different water quality parameter from the list at the top to change the map. Learn More about Water Quality Contour Mapping »

Loading interactive contour map viewer...
Contour Visibility:

Visit the Water Quality Contour Mapping Tool to view and compare monthly water quality contour maps for ten different water quality indicators. In addition, you can generate your own custom maps.

Contour Legend:

  • Less than 1 mg/l
  • 1.0 - 5.9 mg/l
  • 6.0 - 10.9 mg/l
  • 11.0 - 17.9 mg/l
  • Greater than 18 mg/l

Seagrasses

Among the most important habitats in Florida's estuarine environments, seagrass beds are indispensable for the role they play in cycling nutrients, supplying food for wildlife, stabilizing sediments, and providing habitat for juvenile and adult finfish and shellfish. Use the interactive map below to observe the size, density and location of seagrass beds from year to year. The graph shows how the total amount of seagrass in the bay has changed over time. Learn More about Seagrasses »

Loading interactive seagrass coverage viewer...
Loading interactive chart...
Target
2,022 acres

Land Use / Land Cover

Land use within a bay'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 (upland or wetland, e.g.), 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 »

Sarasota Bay is located within the Sarasota Bay Watershed. The chart below shows the land use / land cover characteristics for Sarasota Bay Watershed within the boundary of this Water Atlas. View details about the Sarasota Bay Watershed »

Loading interactive chart...