Mo. Rev. Stat. § 260.1021: Recording of a covenant, procedure.

1. An environmental covenant and any amendment or termination of the covenant shall be recorded in every county or city not within a county in which any portion of the real property subject to the covenant is located. For purposes of indexing, a holder shall be treated as a grantee.

2. Except as otherwise provided in section 260.1024, an environmental covenant is subject to the laws of this state governing recording and priority of interests in real property.