Can I Reuse My Bottled Water Bottle?

Reusing a Disposable Water 

Question: Can I Reuse a Disposable Bottled Water Bottle?

How safe is it to reuse a single-use bottled water bottle? Fears about chemicals leaching from disposable bottles into the water when reused were spurred by one master's thesis from a University of Idaho student. He suggested that chemicals leach from the plastic used for single-use bottled water bottles into the water if the bottles were reused and subjected to light, heat, and time.

However, this study has been contradicted by other experts, who point out this thesis was not subject to peer review or published in a scientific journal.

Concerns Refuted Over Chemicals Leaching When Reusing Single-Use Water Bottles

The concerns over the safety of the plastic used in single-use water bottles are refuted by the International Bottled Water Association:

"FDA assesses the migration potential of plastics and the substances with which they are made. FDA allows food-contact plastics for their intended use based on migration and safety data. The clearance process includes stringent requirements for estimating the levels at which such materials may transfer to the diet. FDA's safety criteria require extensive toxicity testing for any substance that may be ingested at more than negligible levels.

This means FDA has affirmatively determined that, when plastics are used as intended in food-contact applications, the nature and amount of substances that may migrate, if any, are safe."

The issue of chemicals leaching into water bottles is discussed at length by the Snopes Urban Legends site, Bottle Royale.

Bacterial Concerns for Reusing Any Water Bottle - Keep it Clean

The real culprits for the safety of reusing any water bottle are the bacteria and fungi that can grow in damp or partially full bottles once they have been opened.

These bacteria generally come from your hands and mouth, or any dirt that comes in contact with the mouth of the bottle.

Cleaning Your Water Bottle

Both single-use and reusable water bottles should be thoroughly cleaned and dried between uses. Reusable water bottles generally have wider mouths, making them easier to clean. Dishwashing soap and hot water are acceptable to use for cleaning your water bottle. The risks of bacterial and fungal growth are higher if you use the bottle with a drink that contains sugars. Immediately drain, rinse, and wash your water bottle after your walk if you use it with sports drinks or juices.

Sanitising Your Water Bottle

If you have visible bacterial slime or mold in your water bottle, you should sanitize your water bottle with a dilute bleach solution of 1 teaspoon bleach and 1 teaspoon of baking soda in 1 quart of water. Allow the solution to sit in the bottle overnight, then thoroughly rinse and dry the bottle before using it again.

What About Lexan Polycarbonate Water Bottles?

There are concerns about reusable water bottles made of plastic #7 (Lexan, Nalgene and other clear polycarbonate water bottles) and the possibility that they may leach bisphenol A (BPA).

Lexan polycarbonate water bottles have been shown to be safe for use and reuse by the bulk of the research. However, Nalgene and other manufacturers are reformulating their plastic to offer BPA-free water bottles to the public to erase any concerns. 

Are Lexan Water Bottle Safe?

Should You Use a BPA-Free Water Bottle?