Certain wells exempted from regulation.
Mo. Rev. Stat. § 256.620
in effect256.620. 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)
Source: Open US Law by Vaquill AI (CC BY 4.0)URL: https://revisor.mo.gov/main/OneSection.aspx?section=256.620Fetched: 10/17/2026