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Explore data for pollutants transferred from facilities in one country to facilities in another country.

Report Type

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Results and how to use them:

  • A list of all facilities with the amount reported by each facility
  • Click on a facility name to get a breakdown of all pollutants (and amounts) reported
  • View the facility location on the map inset
  • Download the data
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Results and how to use them:

  • The industry(ies) reporting and the amount reported by industry
  • Click on the industry name to get a breakdown of amounts reported by state/province/territory, pollutant, and facility
  • Download the data
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Results and how to use them:

  • The country(ies) reporting and the amount reported by country
  • Click on the country name to get a breakdown of amounts reported by state/province/territory, pollutant, and industry
  • Download the data
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Results and how to use them:

  • The state/province/territory(s) reporting and the amount reported by region
  • Click on the state/province/territory name to get a breakdown of amounts reported by pollutant, industry, and facility
  • Download the data
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Results and how to use them:

  • The associated watershed(s), and the amount reported by watershed
  • Click on the watershed name to get a breakdown of amounts reported by pollutant, industry, and facility
  • Download the data
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Results and how to use them:

  • The pollutants reported and the amounts reported
  • Click on a pollutant name to get a breakdown of amounts reported by state/province/territory, industry, and facility
  • Download the data
* For air and water releases, check the "TEP values" box to see the risk scores available for certain pollutants.

Toxic Equivalency Potentials (TEP) for Air and Water Releases

Toxic Equivalency Potentials (TEPs) indicate the relative human health risk associated with a release of one unit of a pollutant, compared to the risk posed by the release of one unit of a reference substance. TEPs are calculated using the CalTOX model, developed by California regulatory agencies. TEPs are one of many different screening tools, each of which is based on a series of assumptions, thus yielding different results.

Readers should note that the TEP analysis is limited in that a release does not directly correlate to actual exposures or levels of risk. In addition, not all of the substances have an assigned TEP (information on their toxicity or exposure potential may be missing). While these pollutants are not ranked by TEP, they should not be assumed to be without risk. Other types of releases not ranked by TEP (e.g., land) should also not be assumed to be without risk.

TEPs are available only for air and water releases. The reference chemical for carcinogens is benzene and the reference chemical for non-carcinogens is toluene. In the Taking Stock report and database, the TEP weight is multiplied by the amount of release to provide a score for each pollutant. The TEPs for Taking Stock have been taken from the Scorecard website

Ungroup results based on:


    Pollutant Thresholds

    Pollutant-based reporting thresholds exist, and certain pollutants have lower reporting thresholds due to their greater potential for risk to human health and the environment. In general, the PRTR pollutant thresholds are as follows:

    • For Canada's NPRI and the US TRI, a facility must report if it manufactures, processes, or otherwise uses (e.g., in cleaning industrial equipment) 10,000 kilograms (NPRI) or 11,340 kilograms (TRI) of a listed pollutant.
    • Mexico's RETC has both an "activity" threshold and a "release" threshold. A facility must report if it meets or exceeds either threshold. The RETC "activity" threshold is typically either 2,500 kilograms or 5,000 kilograms, depending on the substance; the typical "release" threshold is 1,000 kilograms.

    Employee Thresholds

    Both NPRI and TRI have an employee threshold, generally corresponding to the equivalent of 10 full-time employees (with some exceptions for pollutants or certain types of facilities). Mexico's RETC does not have an employee threshold.


        Watershed Based on its reported location, each facility has been assigned a watershed from the Watersheds dataset in CEC’s North American Environmental Atlas.
        • Note that there are Level III watersheds only in the Mississippi River System (i.e., Mississippi Sub-Basins).


          Pollutant Type

            PRTR data alone cannot provide enough information to assess the potential harm from a pollutant; however, the data in combination with other information about a pollutant can serve as a starting point for learning more about its potential impacts. Readers may wish to other sources for more information, including:

              North American Industry Classification System

              Canada, Mexico and the United States have adopted the North American Industry Classification System (NAICS), whose codes are used to categorize the industrial activities of a facility. NAICS codes were established in 1997 and since 2006 they have been incorporated into PRTR reporting to replace the standard industrial classification (SIC) codes used by each country. Although there is some variation among the three countries in the subsector categorizations and codes used, the breakdown of industrial sectors into general categories is the same. For more information about the implementation of the NAICS system in each country, see:

              NAICS codeIndustry
              11Agriculture, forestry, fishing and hunting
              21Mining, quarrying and oil and gas extraction
              22Utilities (electricity, water and gas distribution)
              41/42/43Wholesale trade
              44/45/46Retail trade
              48/49Transportation and warehousing
              51Information and cultural industries
              52Finance and insurance
              53Real estate and rental and leasing
              54Professional, scientific and technical services
              55Management of companies and enterprises
              56Administrative and support, waste management and remediation services
              61Educational services
              62Health care and social assistance
              71Arts, entertainment and recreation
              72Accommodation and food services
              81Other services (except public administration)
              91/92/93Public administration

              PRTR reporting requirements are based in part on the industrial activity undertaken within a facility, and not only the industry code assigned to that facility. Therefore, not all facilities within a given sector might have to report. For example, within the economic sector that includes dry-cleaning only those facilities undertaking the actual dry-cleaning process, and not clothing drop-off points, might be required to report. Another example is a food processing plant that is required to report because it has its own power plant to generate electricity.

              Readers should also note that facilities with similar activities can report under different, or multiple, NAICS codes, depending on the activities undertaken at the facility.

              Taking Stock Online provides data at the 3-, 4- and 5-digit NAICS code level. In some cases, the North American Industry Classification System (NAICS) codes differ among the three countries. For example, the code for Wholesale Trade is 41 in Canada, 42 in the United States and 43 in Mexico. When querying data for an industrial sector whose code begins with any of the 2 digits below, the results returned might include only partial data. Therefore, you might also wish to consult the data reported under the corresponding codes provided.

              Industrial Sector NameCorresponding Codes in each Country
              (for the series starting with the 2 digits indicated)
              CanadaMexicoUnited States
              Wholesale Trade414342
              Retail Trade44, 454644, 45
              Public Administration919392

              North American Industry Classification System (NAICS)


              Which Industries Report?

              Each country requires PRTR reporting by facilities in specific industrial sectors or undertaking specific industrial activities.

              • In Canada, all facilities that meet reporting thresholds and requirements report to the NPRI, with the exception of a few resource-based sectors and certain activities such as research laboratories.
              • In Mexico, all industrial sectors regulated under federal law are required to report to the RETC, along with facilities in other sectors that engage in activities subject to federal regulation. These include facilities that handle hazardous wastes, or discharge into national water bodies.
              • In the United States, TRI requires reporting by federal facilities, most manufacturing facilities and industries that service manufacturing facilities (e.g., electric utilities and hazardous waste management facilities).

              Click here for more information

                • Values reported in pounds are converted to kilograms using a conversion factor of 2.205
                • Values reported in tonnes are converted to kilograms using a conversion factor of 1000

                Units of Measurement

                Query Summary
                Report Type
                • Ungroup by
                • Country
                • State/Province/Territory
                • Watershed
                • Common
                • Pollutant Type
                • Pollutant
                • Units of Measurement
                • NAICS
                • Industry

                RELATED VIDEOS

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                Webinar: Using Taking Stock Online to explore North American Industrial Pollution Data

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                For more information about Taking Stock, please contact:

                ORLANDO CABRERA

                Program Manager

                Environmental Quality and Climate Change

                (514) 350-4323


                The data are taken from the US Toxics Release Inventory, the Canadian National Pollutant Release Inventory (NPRI), and the Mexican Registro de Emisiones y Transferencia de Contaminantes (RETC).  Each country has its own list of mandatory pollutants. Reporting thresholds for pollutants, sectors and facilities also vary. For details, see Using and Understanding Taking Stock.
                The national PRTR datasets are constantly evolving, as facilities revise previous submissions to correct reporting errors or make other changes. For this reason, the three countries 'lock' their data sets on a specific date and use the 'locked' data for annual summary reports. Each year, the countries issue revised databases that cover all reporting years. The CEC follows a similar process. For the purposes of this 2006-2013 database, the NPRI dataset from September 2016, the TRI Basic Data Plus dataset from November 2016 and the RETC dataset from August 2014 were used. Readers can visit the national PRTR websites to see if any changes to the data have occurred.