Washington

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

Washington County

10/30/2007 - 6/17/2025, 443 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		 418 20.7 0.0 1011.2 284 67.9 0
E.
Coli		 MPN/100
mL		 418 0.0 0.0 200.5 120 28.7 0
pH
-		 361 7.6 5.9 9.2 19 5.3 6.5-8.5
Total
Dissolved
Solids		 mg/L 359 349.0 20.0 1546.0 64 17.8 500
Corrosivity
Index*
-		 114 0.5 -2.3 1.1 80 70.2 -
Hardness mg/L 123 235.4 0.8 785.4 - - -
Nitrate+Nitrite
N		 mg/L 117 0.5 0.2 6.2 0 0.0 10
Chloride mg/L 164 16.9 1.1 564.8 6 3.7 250
Sulfate mg/L 59 31.8 1.0 226.4 0 0.0 250
Aluminum mg/L 36 0.0 0.0 4.1 6 16.7 0.05-0.2
Arsenic mg/L 121 0.00 0.001 0.011 1 0.8 0.01
Barium mg/L 208 0.09 0.00 2.34 1 0.5 2
Cadmium mg/L 56 0.00 0.001 0.002 0 0.0 0.005
Calcium mg/L 112 66.91 0.25 246.01 - - -
Chromium mg/L 56 0.0 0.001 0.005 0 0.0 0.1
Copper mg/L 172 0.01 0.01 1.04 0 0.0 1.0,1.3
Iron mg/L 118 0.1 0.1 19.9 16 13.6 0.3
Lead-1st
draw		 mg/L 103 0.00 0.003 0.047 5 4.9 0.015
Lead-Running mg/L 125 0.003 0.003 1.114 7 5.6 0.015
Magnesium mg/L 112 15.13 0.05 65.68 - - -
Manganese mg/L 137 0.01 0.01 4.61 21 15.3 0.05
Mercury mg/L 50 0.00 0.000 0.001 0 0.0 0.002
Nickel mg/L 56 0.01 0.005 0.022 - - -
Sodium mg/L 35 49.46 0.25 272.89 - - -
Zinc mg/L 56 0.01 0.005 0.22 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