At the time as a public sewer becomes available to a property served by an on-site wastewater treatment and disposal system, as provided in § 52.005, a direct connection shall be made to the public sewer in compliance with this sewer chapter and the on-site wastewater treatment and disposal system shall be abandoned and filled with suitable material.
(Iowa Code § 364.12(3)(f)) (1999 Code, § 98.07) Penalty, see § 52.999