256.620 Certain wells exempted from regulation.

256.620. Certain wells exempted from regulation. — 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. (L. 1985 S.B. 281 § 7, A.L. 1991 S.B. 221)