CFR › Title 40 › Part 60 › §60.477040 CFR §60.4770Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkYes, your SSI unit is an affected source if it meets all the criteria specified in paragraphs (a) through (c) of this section.(a)Your SSI unit is a SSI unit for which construction commenced after October 14, 2010 or for which modification commenced after September 21, 2011.(b)Your SSI unit is a SSI unit as defined in § 60.4930.(c)Your SSI unit is not exempt under § 60.4780.