StacksVerified U.S. regulatory reference

40 CFR §121.10

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Provided that the Federal agency and the certifying authority agree in writing that the certifying authority may modify a grant of certification (with or without conditions), the certifying authority may modify only the agreed-upon portions of the certification. The certifying authority is not required to obtain the Federal agency's agreement on the language of the modification.
  2. (b)The certifying authority shall not, through a modification pursuant to paragraph (a) of this section:
    1. (1)Revoke a grant of certification (with or without conditions); or
    2. (2)Change a grant of certification (with or without conditions) into a denial or waiver of certification.