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Data Sources and Methods for the Release of Toxic Substances to Water Indicators

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Methods

Facilities report an estimate of their releases to water to the NPRI using one of the following methods:

  • Continuous emission/release monitoring systems
  • Predictive emission/release monitoring
  • Source testing
  • Mass balance
  • Site-specific emission/release factor
  • Published emission/release factor
  • Engineering estimates

Please consult the “Reporting to the NPRI” webpage for more details on these calculation methods.

Table 1: Number of NPRI facilities reporting Hg, Pb and Cd releases to water, Canada, 2003-2010
SubstanceHgPbCd
2003
76
164
129
2004
62
172
144
2005
53
163
139
2006
66
163
139
2007
65
182
145
2008
61
180
135
2009
84
190
146
2010
75
192
153
Common*
24
96
79
Total**
129
277
215

 * Number of facilities common to all years
** Total number of facilities reporting this toxic substance for one or more years

 Source descriptions for the indicators were taken from the North American Industry Classification System (NAICS) used by Statistics Canada. The four-digit NAICS code, as reported by the facilities, was used for source classification.

 

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