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Scheduled Proficiency Testing & PT Express™ for Wastewater Testing

NSI is a globally trusted brand for laboratory quality control standards and proficiency tests. Use of our Certified Reference Materials (CRMs) and Proficiency Tests (PT) Standards on a routine basis to monitor analytical performance will defensibly document data quality and support accreditation requirements. We are laser focused on developing, manufacturing, and delivering unique ISO-accredited certified reference materials (CRMs) that are not only stable but are also easy to implement into routine testing work streams.

Interested in our GGA Concentrate Snips™? To use, simply snip open the tube and pour contents directly into a 300mL BOD bottle. No measurements are required and no contamination is possible. Watch the video below for a full product demonstration!


Our Wastewater Standards Are Convenient & Easy-To-Use
Some unique wastewater product concepts include:

  • Pre-measured, single-use reference materials that prevent laboratory errors and re-work.
  • Ready-to-use CRMs requiring no preparatory steps to save time and effort.
  • Cocktailed, multi-parameter CRMs that can be used for numerous types of testing procedures. Thus, reducing the number of CRMs needed in the typical laboratory.

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SKU: PEI-191

Ignitability Wastewater PT Standard, 110 mL bottle

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
SKU: PEI-180

Uranium Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/ICP Confirmation
SKU: PEI-146

Perchlorate Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Gravimetric w/IC Confirmation
SKU: PEI-139

Complex Nutrients (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-138

Simple Nutrients (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-137

Hardness (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-136

Minerals (2 pack)

  • CCL
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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-130

Color Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-129

SGT - HEM (TPH) Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-128

Hexavalent Chromium Drinking Water Inorganic Standard

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Single: Grav. w/Analytical Confirmation
SKU: PEI-127

Volatile Solids Wastewater PT Standard (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
SKU: PEI-126

Settleable Solids (2 pack)

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  • Brand NSI
  • Raw Material >95% min; as available
  • Certification Gravimetric and/or Volumetric
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