Quality control: National Pollutant Release Inventory

National Pollutant Release Inventory (NPRI) team checks to ensure the data received from facilities is correct and complete. If errors are found, NPRI contacts facilities to help them correct the data.

We confirm this information about facilities:

  • Latitude and longitude
  • Business Number of organization
  • Sector classification codes 

We ask these questions about the data facilities report:

  • Is the data reported in the right place?
  • Is the data reported in the right units?
  • Do the data values fall within expected ranges?
  • Is the data consistent with last year’s reports?
  • Is the data consistent with data from other sources?
  • Are all releases, disposals and transfers of reportable substances included?
  • Did the organization report for all of its facilities?
  • Did the facility provide information that helps explain the reported data?
  • Are the top facilities (by substance and source) consistent from year-to-year?
Results of quality control for the 2017 reviewed NPRI data:
  • Some data was reported in incorrect units or with decimal errors (such as reporting in kilograms instead of tonnes).
  • Sometimes a substance or quantity was omitted.
  • Some facilities used incorrect reference data or assumptions. For example, some reports include the total amount of a substance used at the facility, rather than the quantity released.

To learn more about the 2017 NPRI data, see Canada’s National Pollutant Release Inventory: data highlights 2017.

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