The proficiency testing studies help improve quality and comply with regulations. Order the NSI PT Express™, our on-demand proficiency testing, when you have an immediate need for proficiency test results.

These environmental chemistry drinking water proficiency tests are designed for identification of target chemicals in drinking water.

Environmental Chemistry Drinking Water PT Express samples may take 7 to 10 business days to ship. If you need the samples sooner, please call NSI at 1-800-234-7837 to expedite your order.

For determination of the following elements:
Alkalinity: 25 to 200 mg/L
Chloride: 20 to 160 mg/L
Conductivity: 130 to 1300 µmhos/cm
Fluoride: 1 to 8 mg/L
Nitrate as N: 3 to 10 mg/L
Nitrate/Nitrite to N: 3 to 10 mg/L
Potassium: 10 to 40 mg/L
Sulfate: 25 to 250 mg/L
Total Dissolved Solids: 100 to 1000 mg/L