(a) A landowner within a sensitive area, identified under section 103H.101, has a complete defense to liability for degradation of groundwater caused by surface water from the sensitive area recharging groundwater if:

1. (1) the landowner's portion of the sensitive area is subject to a plan adopted by the soil and water conservation district to protect the groundwater from degradation through surface water recharge;
2. (2) the projects and practices required by the plan have been implemented and have been certified as having been implemented by the soil and water conservation district;
3. (3) the projects and practices required by the plan are maintained according to the plan; and
4. (4) the landowner has not allowed unlawful practices on the property that disrupt the projects and practices required by the plan.