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Armstrong

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

Armstrong County

11/15/2007 - 1/25/2017, 72 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
71 36.4 0.0 200.5 54 76.1 0
E.
Coli
MPN/100
mL
71 0.0 0.0 200.5 22 31.0 0
pH
-
57 7.4 5.4 8.7 13 22.8 6.5-8.5
Total
Dissolved
Solids
mg/L 57 182.0 20.0 1850.0 8 14.0 500
Corrosivity
Index*

-
14 -0.8 -2.7 0.8 12 85.7 -
Hardness mg/L 16 91.5 1.7 607.4 - - -
Nitrate+Nitrite
N
mg/L 22 0.7 0.2 6.8 0 0.0 10
Chloride mg/L 19 6.5 2.0 349.9 1 5.3 250
Sulfate mg/L 8 37.6 3.0 506.9 1 12.5 250
Aluminum mg/L 8 0.1 0.0 1.0 4 50.0 0.05-0.2
Arsenic mg/L 5 0.00 0.003 0.010 0 0.0 0.01
Barium mg/L 24 0.06 0.01 0.74 0 0.0 2
Cadmium mg/L 4 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 14 20.98 0.50 105.73 - - -
Chromium mg/L 4 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 18 0.02 0.01 0.23 0 0.0 1.0,1.3
Iron mg/L 18 0.2 0.0 0.6 4 22.2 0.3
Lead-1st
draw
mg/L 10 0.00 0.003 0.019 1 10.0 0.015
Lead-Running mg/L 7 0.003 0.003 0.007 0 0.0 0.015
Magnesium mg/L 12 6.08 0.10 15.27 - - -
Manganese mg/L 21 0.01 0.01 10.87 7 33.3 0.05
Mercury mg/L 6 0.00 0.001 0.100 2 33.3 0.002
Nickel mg/L 4 0.01 0.003 0.005 - - -
Sodium mg/L 2 0.01 0.01 0.01 - - -
Zinc mg/L 4 0.01 0.01 0.01 0 0.0 5

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