Delaware

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

Delaware County

9/11/2007 - 6/16/2025, 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		 193 0.0 0.0 200.5 61 31.6 0
E.
Coli		 MPN/100
mL		 193 0.0 0.0 200.5 6 3.1 0
pH
-		 187 7.3 5.2 9.1 29 15.5 6.5-8.5
Total
Dissolved
Solids		 mg/L 185 241.0 38.0 1080.0 8 4.3 500
Corrosivity
Index*
-		 104 -1.0 -3.5 1.7 68 65.4 -
Hardness mg/L 139 133.8 0.8 402.9 - - -
Nitrate+Nitrite
N		 mg/L 42 2.0 0.2 9.4 0 0.0 10
Chloride mg/L 21 55.2 2.0 315.9 2 9.5 250
Sulfate mg/L 14 22.7 1.0 70.1 0 0.0 250
Aluminum mg/L 5 0.0 0.0 0.1 0 0.0 0.05-0.2
Arsenic mg/L 42 0.00 0.001 0.009 0 0.0 0.01
Barium mg/L 33 0.06 0.00 0.31 0 0.0 2
Cadmium mg/L 18 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 103 31.13 0.25 71.82 - - -
Chromium mg/L 18 0.0 0.002 0.005 0 0.0 0.1
Copper mg/L 123 0.02 0.01 12.72 2 1.6 1.0,1.3
Iron mg/L 136 0.1 0.1 44.9 12 8.8 0.3
Lead-1st
draw		 mg/L 95 0.00 0.003 0.082 11 11.6 0.015
Lead-Running mg/L 107 0.003 0.003 0.024 3 2.8 0.015
Magnesium mg/L 103 10.24 0.05 56.81 - - -
Manganese mg/L 137 0.01 0.01 7.91 14 10.2 0.05
Mercury mg/L 17 0.00 0.000 0.002 0 0.0 0.002
Nickel mg/L 18 0.01 0.005 0.017 - - -
Sodium mg/L 8 18.63 5.70 27.48 - - -
Zinc mg/L 18 0.05 0.010 4.60 0 0.0 5

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

Ag Analytical Services Lab

Address

720 Tower Rd
University Park, PA 16802
Directions

Hours: Monday-Friday, 8:00 AM - 4:00 PM

Ag Analytical Services Lab

Address

720 Tower Rd
University Park, PA 16802
Directions

Hours: Monday-Friday, 8:00 AM - 4:00 PM