Rainwater harvesting in Tennessee is legal and can be used for various purposes, including drinking water. However, it is crucial to ensure rainwater safety before consumption. Rainwater can contain contaminants such as bacteria, viruses, and chemicals, so proper filtration methods are necessary. Filtration methods can range from simple to complex, depending on the intended use of the rainwater. For example, a basic filtration system may include a mesh screen to remove debris, while a more advanced system may include multiple stages of filtration, including activated carbon filters and UV sterilization. Therefore, while rainwater harvesting can be a sustainable and cost-effective option for off-grid living in Tennessee, it is important to prioritize safety and invest in appropriate filtration methods.