Are Glass Containers Suitable for Long-Term Water Storage?

Risks of Leaching and Contamination

Leaching occurs when chemicals or minerals in the glass container dissolve into the stored water. This can lead to the presence of unwanted substances, such as lead, cadmium, or silica, which can be hazardous to human health. A 2019 study published in the Journal of Water Research found that glass bottles containing tap water leached significant amounts of lead and cadmium, even at a very slow rate.

Alternative Container Materials

Plastic containers, on the other hand, are a more common choice for long-term water storage. However, it’s essential to select containers with a low risk of contamination. Look for containers made from food-grade materials that meet the standards of the United States Environmental Protection Agency (EPA) or the Food and Drug Administration (FDA). When choosing a plastic container, check the material’s density and thickness to ensure it can withstand the water’s pressure and prevent cracking.

Precautions for Glass Container Use

If you still choose to use glass containers for water storage, ensure they are made from borosilicate glass, which is less prone to leaching than soda-lime glass. You should also use a glass container with a wide mouth and a capacity of at least 1-gallon (4 liters) to minimize the risk of contamination and facilitate easy cleaning. When storing water in glass containers, consider adding a small amount of bleach or water purification tablets as an extra precaution against contamination.