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York

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

York County

8/9/2007 - 7/2/2018, 338 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
329 1.0 0.0 2419.6 165 50.2 0
E.
Coli
MPN/100
mL
329 0.0 0.0 200.5 30 9.1 0
pH
-
311 6.7 4.7 9.8 122 39.2 6.5-8.5
Total
Dissolved
Solids
mg/L 311 135.0 20.0 645.0 2 0.6 500
Corrosivity
Index*

-
118 -1.6 -4.2 0.8 92 78.0 -
Hardness mg/L 126 71.6 0.8 364.2 - - -
Nitrate+Nitrite
N
mg/L 168 5.0 0.2 33.1 17 10.1 10
Chloride mg/L 10 9.0 5.0 36.6 0 0.0 250
Sulfate mg/L 10 11.2 5.7 30.5 0 0.0 250
Aluminum mg/L 9 0.0 0.0 0.1 1 11.1 0.05-0.2
Arsenic mg/L 66 0.00 0.001 0.008 0 0.0 0.01
Barium mg/L 30 0.04 0.00 0.60 0 0.0 2
Cadmium mg/L 19 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 119 14.57 0.25 111.11 - - -
Chromium mg/L 19 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 129 0.05 0.01 4.36 7 5.4 1.0,1.3
Iron mg/L 127 0.1 0.0 25.0 10 7.9 0.3
Lead-1st
draw
mg/L 51 0.01 0.003 0.095 15 29.4 0.015
Lead-Running mg/L 105 0.003 0.003 0.500 11 10.5 0.015
Magnesium mg/L 92 5.49 0.05 45.59 - - -
Manganese mg/L 121 0.01 0.01 16.67 47 38.8 0.05
Mercury mg/L 48 0.05 0.000 18.442 28 58.3 0.002
Nickel mg/L 15 0.01 0.005 0.022 - - -
Sodium mg/L 27 0.01 0.01 0.30 - - -
Zinc mg/L 35 0.01 0.00 0.38 0 0.0 5

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