Introduction The NPRI changed significantly for the 2000 reporting year with the introduction of alternate reporting thresholds.
Many substances pose serious risks to human health or the environment in relatively low quantities.
These reporting criteria are explained in Section 2. Section 3 explains what information is required and how to complete the reporting form. This Guide, together with the Supplementary Guide, should be consulted by owners and operators of facilities to determine if they must report for any NPRI substances.