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2012 Water quality status and trends report summary tables

Note: See Report page for definitions.

Median analyte values by major basin

Analyte

Indian River Lagoon

Lake George

Lower St. Johns River

Middle St. Johns River

Nassau River

Northern Coastal

Ocklawaha River

St. Marys River

Upper St. Johns River

Ca Mg hardness
(calculated mg/L as CaCO3)

3300.11

196.09

293.37

140.10

1094.21

1604.11

129.80

70.58

116.69

color
(platinum-cobalt units)

19.58

70.04

87.14

106.61

251.84

29.40

38.26

341.60

180.40

corrected chlorophyll-a
(ug/L)

8.38

12.47

7.94

20.15

4.90

4.85

34.24

0.63

11.30

dissolved oxygen analysis by probe
(mg/L)

6.27

6.17

6.29

7.02

5.70

5.69

7.12

6.01

4.35

lab turbidity
(NTU)

4.55

3.72

4.14

4.86

9.77

6.18

8.86

4.90

3.75

pH
(standard units)

7.98

7.45

7.23

7.52

6.83

7.60

7.93

6.21

7.00

salinity
(ppt)

26.68

0.47

3.99

0.09

7.22

22.43

0.18

0.31

0.55

secchi disc transparency
(meters)

1.00

0.95

1.31

0.58

0.50

0.97

0.66

0.53

0.52

specific conductance field
(uhmhos/cm at 25° C)

41113.90

1096.46

5125.41

621.89

10394.75

34275.07

331.32

1160.56

599.85

total alkalinity
(mg/L as CaCO3)

174.22

72.63

61.46

58.35

44.94

116.70

104.47

7.42

63.60

total calcium
(mg/L as Ca)

246.00

47.47

51.14

36.38

75.35

123.20

35.57

7.75

33.60

total chloride
(mg/L)

9952.68

250.29

498.28

119.32

3349.16

4384.20

27.16

168.59

79.65

total dissolved solids
(mg/L dried at 180° C)

824.00

556.50

373.00

120.00

10900.00

245.33

189.25

1238.50

654.50

total kjeldahl nitrogen
(ug/L as N)

990.71

974.40

823.06

1232.48

1196.78

624.93

2060.15

1017.40

1533.45

total magnesium
(mg/L as Mg)

638.46

18.71

40.41

11.90

220.04

311.60

9.80

12.51

7.92

total nitrogen
(ug/L as N)

1017.42

1077.64

891.31

1397.04

1232.15

652.22

2230.27

1037.85

1616.46

total organic carbon
(mg/L as C)

10.60

14.16

15.92

18.30

26.79

12.67

20.56

46.06

28.69

total phosphorus
(ug/L as P)

81.41

63.71

95.40

93.55

133.35

95.82

83.69

39.61

114.05

total potassium
(mg/L as K)

233.42

5.78

13.93

4.10

67.61

113.35

5.56

3.85

3.17

total sodium
(mg/L as Na)

5175.69

133.92

266.66

67.12

1788.15

2566.58

14.22

93.07

37.71

total sulfate
(mg/L as SO4)

1466.40

62.76

128.80

48.30

451.80

628.85

21.49

23.10

20.61

total suspended solids
(mg/L)

11.72

6.40

7.22

8.03

22.30

19.20

17.65

4.64

5.69

water temperature
(degrees C)

25.37

23.83

21.87

23.15

21.86

22.90

23.56

20.57

23.51

Trend results by analyte
(expressed as the percent of sites)

Analyte

Increasing

Decreasing

Stable

Insufficient
Data

No
Data

Ca Mg hardness

24.25

4.48

31.72

14.93

24.63

color

2.24

44.78

32.46

20.52

0.00

corrected chlorophyll-a

23.88

10.82

41.04

17.16

7.09

dissolved oxygen analysis by probe

16.04

12.69

58.58

11.57

1.12

lab turbidity

24.63

14.18

47.01

14.18

0.00

pH

48.51

7.84

30.60

13.06

0.00

salinity

42.16

0.00

12.69

14.55

30.60

secchi disc transparency

16.42

13.43

31.34

27.61

11.19

specific conductance field

60.07

2.99

23.88

13.06

0.00

total alkalinity

31.34

4.48

26.49

28.36

9.33

total calcium

23.88

5.60

30.97

14.93

24.63

total chloride

36.19

2.61

25.00

11.57

24.63

total dissolved solids

17.54

2.99

39.93

13.81

25.75

total kjeldahl nitrogen

8.58

41.79

36.57

13.06

0.00

total magnesium

27.24

4.10

29.10

14.93

24.63

total nitrogen

8.96

40.67

37.31

13.06

0.00

total organic carbon

14.18

13.43

53.36

15.67

3.36

total phosphorus

18.28

17.91

50.75

13.06

0.00

total potassium

29.85

2.61

23.51

19.03

25.00

total sodium

26.12

1.49

27.24

20.52

24.63

total sulfate

25.37

6.34

29.48

14.18

24.63

total suspended solids

5.60

45.90

35.82

12.69

0.00

water temperature

1.87

4.48

80.97

12.69

0.00

Note: The trend analysis demonstrates change during the report time period. This report does not attempt to analyze the cause of any change, nor the impact of any change.

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St. Johns River Water Management District
4049 Reid Street, Palatka, FL 32177
(800) 725-5922