Share

Centre

Summary of Drinking Water Samples Tested by the Penn State Agricultural Analytical Services Laboratory

Centre County

6/20/2007 - 7/3/2017, 843 Samples

Test Parameter Units Number of Samples Tested Median Minimum Maximum Number of samples failing EPA Std Percent of samples failing EPA Std EPA Drink Water Std
Total
Coliform
MPN/100
mL
737 1.0 0.0 2419.6 405 55.0 0
E.
Coli
MPN/100
mL
737 0.0 0.0 344.1 132 17.9 0
pH
-
584 7.7 5.2 9.2 50 8.6 6.5-8.5
Total
Dissolved
Solids
mg/L 574 243.5 20.0 1740.0 30 5.2 500
Corrosivity
Index*

-
241 -0.0 -5.5 2.1 176 73.0 -
Hardness mg/L 297 121.2 0.8 1777.9 - - -
Nitrate+Nitrite
N
mg/L 275 1.2 0.2 17.1 6 2.2 10
Chloride mg/L 59 7.5 2.0 158.4 0 0.0 250
Sulfate mg/L 58 14.2 3.0 113.1 0 0.0 250
Aluminum mg/L 23 0.0 0.0 0.4 6 26.1 0.05-0.2
Arsenic mg/L 136 0.00 0.001 0.041 11 8.1 0.01
Barium mg/L 79 0.03 0.00 0.77 0 0.0 2
Cadmium mg/L 25 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 234 27.40 0.25 540.35 - - -
Chromium mg/L 25 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 258 0.02 0.01 68.72 3 1.2 1.0,1.3
Iron mg/L 279 0.1 0.0 95.1 50 17.9 0.3
Lead-1st
draw
mg/L 94 0.00 0.003 0.108 11 11.7 0.015
Lead-Running mg/L 134 0.003 0.003 0.079 4 3.0 0.015
Magnesium mg/L 197 6.07 0.05 104.09 - - -
Manganese mg/L 267 0.01 0.01 43.90 72 27.0 0.05
Mercury mg/L 64 0.05 0.000 3.796 39 60.9 0.002
Nickel mg/L 20 0.01 0.005 0.010 - - -
Sodium mg/L 43 0.01 0.01 0.27 - - -
Zinc mg/L 47 0.00 0.00 0.15 0 0.0 5

*For corrosivity index, failure criteria based on less than -0.5 or greater than 0.5