Versions of Iowa Code 135.39E - Fluoridation in public water supply -- notice of discontinuance on LawServer 2024 Iowa Code 135.39E – Fluoridation in public water supply — notice of discontinuance 2023 Iowa Code 135.39E – Fluoridation in public water supply — notice of discontinuance 2022 Iowa Code 135.39E – Fluoridation in public water supply — notice of discontinuance.