All Data in ppm                 Median based  
  Mg     Ca     N   Water hardness  
  Ave Median SD Ave Median SD Mg Ca ppm CaCO3  
all 13.2 7.2 19.7 18.1 8.3 45.3 131 76 50  
S'05 14.6 7.8 14.8 26.5 8.3 60.2 8 16 53  
F'04 15.7 8.2 29.2 32.4 6.6 83.1 20 21 50  
F'00 9.6 6.2 10.1 9.8 6.4 6.5 21 25 42  
S'01 18.5 5.2 27.1 15.00 10.8 11.4 12 14 49  
Davis 50.2 71.9 41.5 18.9 NA 14.9 3 2 NA  
Sac Region 7.4 5.8 6.6 14.7 7.0 30.6 56 76 41  
Surrounding Region 29.4 19.2 38.8 30.1 11.7 77.0 21 23 108  
Near CSUS/So. Side 3.7 2.4 3.3 8.5 8.7 2.0 6 13 31  
Near CSUS/No. Side 11.9 9.9 5.3 29.4 6.7 69.7 12 14 58  
South Sacramento 7.3 5.8 7.7 7.9 5.6 6.3 17 10 38  
NE region 2.3 1.8 1.5 9.6 6.9 9.2 12 20 25  
Rancho Cordova 5.5 5.2 2.8 8.1 6.4 3.0 4 6 37