Mo. Rev. Stat. § 256.620
Current with changes from the 2024 Legislative Session
Except as provided in section 256.615, operational wells in existence on September 28, 1985, shall not be required to conform to the provisions of sections 256.600 to 256.640, or any rules or regulations adopted pursuant thereto unless such wells or pump installations for such wells are determined to present a threat to groundwater.
§ 256.620, RSMo