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

Centre County

6/20/2007 - 7/2/2018, 991 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
860 1.0 0.0 2419.6 476 55.3 0
E.
Coli
MPN/100
mL
860 0.0 0.0 344.1 152 17.7 0
pH
-
654 7.7 5.0 9.4 58 8.9 6.5-8.5
Total
Dissolved
Solids
mg/L 644 241.5 20.0 1740.0 34 5.3 500
Corrosivity
Index*

-
276 0.0 -5.5 2.1 204 73.9 -
Hardness mg/L 336 123.2 0.8 1777.9 - - -
Nitrate+Nitrite
N
mg/L 312 1.2 0.2 17.1 9 2.9 10
Chloride mg/L 60 7.5 1.7 158.4 0 0.0 250
Sulfate mg/L 63 13.8 3.0 113.1 0 0.0 250
Aluminum mg/L 27 0.0 0.0 0.4 6 22.2 0.05-0.2
Arsenic mg/L 153 0.00 0.001 0.071 13 8.5 0.01
Barium mg/L 89 0.03 0.00 0.77 0 0.0 2
Cadmium mg/L 29 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 269 27.20 0.25 540.35 - - -
Chromium mg/L 29 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 285 0.02 0.01 68.72 7 2.5 1.0,1.3
Iron mg/L 318 0.1 0.0 95.1 52 16.4 0.3
Lead-1st
draw
mg/L 98 0.00 0.003 0.108 11 11.2 0.015
Lead-Running mg/L 161 0.003 0.003 0.103 8 5.0 0.015
Magnesium mg/L 197 6.07 0.05 104.09 - - -
Manganese mg/L 302 0.01 0.01 43.90 104 34.4 0.05
Mercury mg/L 102 0.05 0.000 22.612 77 75.5 0.002
Nickel mg/L 20 0.01 0.005 0.010 - - -
Sodium mg/L 76 0.01 0.01 0.36 - - -
Zinc mg/L 79 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