The data that you see here represents the water hardness that other students have measured in the past. 

 

 

Use this data as a starting point for your tap water dilutions.  Your measured water hardness may vary from this

 

data substantially.  The substantial standard deviations do not represent measurement error.  They represent

 

 

the wide range of concentrations encountered in different samples.  Ave = average; SD = standard deviation

 

 

 

 

 

 

 

 

 

 

 

 

Mg

 

Ca

 

Number of Samples

Water Hardness

 

 

 

Ave (ppm)

SD (ppm)

Ave (ppm)

SD (ppm)

Mg

Ca

ppm CaCO3O3

 

 

 

Davis

40

40

20

10

4

3

222

 

 

 

Sac Region

8

7

20

30

49

63

71

 

 

 

Surrounding Region

30

40

40

90

18

13

221

 

 

 

Near CSUS/So. Side

3

2

8

2

6

12

30

 

 

 

Near CSUS/No. Side

13

5

30

70

12

13

132

 

 

 

South Sacramento

7

9

6

3

10

11

45

 

 

 

NE region

4

7

10

10

11

15

43

 

 

 

Rancho Cordova

6

2

9

3

5

6

45