Before signing an agreement to sell or transfer real property in Washington County that is not served by a municipal water system, the seller must state in writing to the buyer whether, to the seller’s knowledge, the property is located within a special well construction area designated by the commissioner of health under Minnesota Rules, part 4725.3650. If the disclosure under section 103I.235, subdivision 1, paragraph (a), states that there is an unsealed well on the property, the disclosure required under this clause must be made regardless of whether the property is served by a municipal water system.