Can an unclean water bottle actually make you sick?

Studies have found that unwashed reusable water bottles can contain more bacteria than a pet's water bowl or even a toilet seat! When you drink from a bottle, bacteria from your mouth transfer to the rim and interior. In warm conditions, these bacteria multiply rapidly, especially in plastic bottles with scratches and crevices where microorganisms hide.

Common contaminants found in dirty water bottles include E. coli, Staphylococcus, and various molds, which can cause gastrointestinal issues, infections, and allergic reactions. This is why choosing a bottle that's easy to clean and naturally resistant to bacterial growth—like stainless steel—is so important. We recommend washing your bottle daily with hot, soapy water and letting it air dry completely.