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Column Name: METHOD
Description: Identifies the method used to assign a NAICS code to a TRI submission. In reporting years 1987 through 2005, the TRI program collected Standard Industrial Classification (SIC) codes on submissions to identify the primary business lines of reporting facilities. In reporting year 2006, the TRI switched to the North American Industrial Classification System (NAICS) codes. To facilitate the comparison of TRI data across these two time periods, NAICS codes were assigned to submissions in reporting years 1987-2005.
The METHOD data element indicates the method that was used to make the assignment of the NAICS code to a submission. Here are the list of values for this data element and their meaning:
| Value | Description |
| Xwalk | The 1987 SIC to 2002 NAICS crosswalk (https://www.census.gov/eos/www/naics/concordances/1987_SIC_to_2002_NAICS.xls) was used to make the assignment |
| FRS | EPA's Facility Registry System (FRS) was used to make the assignment |
| Commercial | Commercial sources that maintain facility information were used to make the assignment |
| Statistics | Statistical methods were used to make the assignment |
| Manual | Manual research was used to make the assignment |
| RY (Year) Data | A NAICS code reported in a specific reporting year (RY) by the facility was used to make the assignment. For example: "RY 2014 Data" means that a primary NAICS code as reported by the facility in 2014 was used as the basis to make the assignment. |
Envirofacts Table Name(s):
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- Data Element:
- ADABAS File:
Properties:
- Type:VARCHAR2
- Length:12
Definition Source:TRI Data Dictionary