Should You Really Drink Water That's Been Sitting Out All Night?

Leaving a glass of water out overnight might make you wonder if it is still safe to drink. While water itself does not become harmful simply by sitting out, exposure to the environment can lead to changes that might affect its quality. Dust, bacteria, or other contaminants from the air can settle into the water, particularly if the glass is uncovered. Additionally, water left out can absorb carbon dioxide, which slightly lowers its pH, giving it a flat taste. Though this change in taste is typically harmless, it might be off-putting to some. It's also important to consider that if the water was in a reusable bottle or container, the material could affect its safety. Certain plastics can leach chemicals into the water over time, particularly if exposed to sunlight or heat. Generally, drinking water left out overnight is unlikely to pose a significant health risk, especially if the environment is clean. However, for optimal taste and safety, it is advisable to cover your water or replace it with a fresh serving. This ensures that you are consuming water that is both pleasant to drink and free from potential contaminants.