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McKean

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

McKean County

9/6/2007 - 7/7/2016, 360 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
353 3.1 0.0 200.5 210 59.5 0
E.
Coli
MPN/100
mL
353 0.0 0.0 88.5 53 15.0 0
pH
-
325 7.4 3.7 9.0 61 18.8 6.5-8.5
Total
Dissolved
Solids
mg/L 325 116.0 19.0 3642.0 7 2.2 500
Corrosivity
Index*

-
243 -0.8 -5.3 1.0 144 59.3 -
Hardness mg/L 44 74.7 1.7 180.5 - - -
Nitrate+Nitrite
N
mg/L 233 0.5 0.2 10.5 1 0.4 10
Chloride mg/L 240 9.0 2.0 2196.2 5 2.1 250
Sulfate mg/L 11 10.5 3.0 16.3 0 0.0 250
Aluminum mg/L 7 0.1 0.0 0.2 6 85.7 0.05-0.2
Arsenic mg/L 232 0.00 0.001 0.023 2 0.9 0.01
Barium mg/L 245 0.07 0.00 6.02 2 0.8 2
Cadmium mg/L 5 0.00 0.001 0.001 0 0.0 0.005
Calcium mg/L 39 19.93 0.50 52.57 - - -
Chromium mg/L 5 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 44 0.01 0.01 0.30 0 0.0 1.0,1.3
Iron mg/L 45 0.1 0.1 22.3 14 31.1 0.3
Lead-1st
draw
mg/L 10 0.00 0.003 0.018 1 10.0 0.015
Lead-Running mg/L 18 0.003 0.003 0.038 1 5.6 0.015
Magnesium mg/L 39 5.50 0.10 12.23 - - -
Manganese mg/L 44 0.05 0.01 2.41 22 50.0 0.05
Mercury mg/L 6 0.00 0.001 0.001 0 0.0 0.002
Nickel mg/L 5 0.01 0.005 0.005 - - -
Sodium mg/L 0 - - - - - -
Zinc mg/L 5 0.01 0.01 0.02 0 0.0 5

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