The 2006 Inventory Update Rule (IUR) collection was the first time that EPA collected information on the industrial processing and use of organic chemical substances from manufacturers and importers producing 300,000 pounds or more of an organic chemical substance at a single site (Form U Part III). For 2006, respondents also provided the five-digit North American Industry Classification System (NAICS) Code to describe the setting in which industrial processing and use occurred. This document discusses the NAICS codes and provides a table which identifies their corresponding Industrial Sector (IS) codes.

• Table showing Industrial Sector (IS) Codes to Replace Five-Digit NAICS (PDF) (PDF)(1 pg, 72 K, October, 2009)
• Inventory Update Reporting (IUR) Technical Support Document Replacement of 5-digit NAICS Codes with Industrial Sector (IS) Codes (PDF)(28 pp, 207 K, October, 2009)