40 CFR §372.23
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The requirements of this part apply to facilities in the following SIC and NAICS codes. This section contains three listings. Paragraph (a) of this section lists the SIC codes to which this part applies. Paragraph (b) of this section lists the NAICS codes that correspond to SIC codes 20 through 39 to which this part applies. Paragraph (c) of this section lists the NAICS codes that correspond to SIC codes other than SIC codes 20 through 39 to which this part applies.