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Montgomery

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

Montgomery County

9/11/2007 - 6/18/2018, 240 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
222 0.0 0.0 200.5 88 39.6 0
E.
Coli
MPN/100
mL
222 0.0 0.0 200.5 13 5.9 0
pH
-
215 7.7 5.8 9.1 10 4.7 6.5-8.5
Total
Dissolved
Solids
mg/L 215 305.0 43.0 1146.0 19 8.8 500
Corrosivity
Index*

-
88 0.3 -3.0 1.0 53 60.2 -
Hardness mg/L 94 190.7 0.8 846.1 - - -
Nitrate+Nitrite
N
mg/L 58 3.0 0.2 13.4 1 1.7 10
Chloride mg/L 10 32.7 6.7 208.1 0 0.0 250
Sulfate mg/L 10 24.9 2.1 32.6 0 0.0 250
Aluminum mg/L 4 0.0 0.0 0.1 0 0.0 0.05-0.2
Arsenic mg/L 53 0.00 0.001 0.109 6 11.3 0.01
Barium mg/L 45 0.06 0.00 0.47 0 0.0 2
Cadmium mg/L 37 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 87 49.60 0.25 226.38 - - -
Chromium mg/L 37 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 112 0.04 0.01 2.55 1 0.9 1.0,1.3
Iron mg/L 98 0.1 0.0 4.6 10 10.2 0.3
Lead-1st
draw
mg/L 47 0.00 0.003 0.079 11 23.4 0.015
Lead-Running mg/L 86 0.003 0.003 0.073 4 4.7 0.015
Magnesium mg/L 57 15.06 0.05 68.21 - - -
Manganese mg/L 89 0.01 0.01 40.56 31 34.8 0.05
Mercury mg/L 65 0.00 0.000 1.272 32 49.2 0.002
Nickel mg/L 29 0.01 0.005 0.010 - - -
Sodium mg/L 33 0.01 0.01 17.39 - - -
Zinc mg/L 58 0.01 0.00 1.21 0 0.0 5

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