IS IT SAFE TO DRINK WATER FROM A PLASTIC BOTTLE LEFT IN A HOT CAR?
Imagine this: You return to your car after a long afternoon outdoors, reach for a bottle of water that has been lying on the seat, and take a big sip. The water feels warm, and suddenly a question pops into your mind: Is it safe to drink water from a plastic bottle that has been left in a hot car?
Many of us carry bottled water while travelling, shopping or going to work. But during summer, the temperature inside a parked car can rise rapidly, especially when it is left in direct sunlight. So, does the heat affect the water inside a plastic bottle? Let's find out!
WHAT HAPPENS WHEN A PLASTIC BOTTLE GETS HOT?
Most disposable water bottles are made from a plastic called polyethylene terephthalate (PET). This material is widely used for packaging drinking water and is considered suitable for its intended use under normal conditions.
However, when a plastic bottle is exposed to high temperatures for a prolonged period, certain substances from the plastic may migrate into the water. Heat can increase this migration, although the amount depends on several factors, including the type of plastic, the temperature, the duration of exposure and the condition of the bottle.
This does not mean that every bottle left in a hot car becomes dangerous. Rather, it is a reason to avoid unnecessary and prolonged exposure to high temperatures.
THE CONCERN ABOUT MICROPLASTICS
Have you ever heard of microplastics? These are tiny plastic particles that can be present in the environment, including drinking water.
Plastic bottles may release small plastic particles during their manufacture, use and storage. Heat and repeated wear may influence the release of these particles. However, scientists are still studying the possible health effects of the amounts of microplastics commonly found in drinking water.
Therefore, although microplastics are a subject of growing scientific interest, it would be incorrect to conclude that drinking water from a bottle left in a hot car will automatically cause harm.
DOES DRINKING HOT WATER FROM A PLASTIC BOTTLE CAUSE CANCER?
You may have come across alarming messages claiming that plastic bottles left in hot cars release cancer-causing chemicals. Such claims should be treated with caution.
For example, the claim that these bottles automatically release dioxins when heated is a common misconception. PET water bottles are not known to release dioxins simply because they become hot.
The actual risk depends on the materials involved and the conditions of exposure. There is no good evidence that taking an occasional sip from a plastic bottle left in a hot car causes cancer.
Nevertheless, avoiding prolonged heat exposure is a sensible precaution.
WHAT IF YOU HAVE ALREADY DRUNK THE WATER?
There is no need to panic if you have already taken a few sips from a bottle that was left in a hot car. An isolated incident is unlikely to cause significant harm, and no special treatment is generally needed simply because the water became warm.
However, if the bottle is leaking, visibly damaged, badly deformed or has an unusual smell or taste, it is best to discard it.
If the water appears cloudy or you suspect that the bottle has been contaminated, do not drink it.
HOW CAN YOU KEEP YOUR DRINKING WATER SAFE?
Here are some simple habits that can help you store drinking water more safely:
- Avoid leaving water bottles in hot cars: Take them with you when you leave the vehicle.
- Keep bottles away from direct sunlight: Store drinking water in a cool, shaded place whenever possible.
- Check the bottle's condition: Do not use bottles that are cracked, leaking or deformed.
- Avoid repeated reuse of disposable bottles: These bottles are primarily designed for single use. Reusable bottles should be cleaned regularly.
- Choose suitable reusable bottles: Food-grade stainless-steel bottles are a convenient option for carrying water while travelling.
- Never assume that a sealed bottle is completely protected from heat: An unopened bottle can also become hot inside a parked car.
An Interesting Fact!
On a sunny day, the temperature inside a parked car can rise considerably above the outside temperature, sometimes reaching extremely high levels even when the weather does not feel exceptionally hot. This is why cars are poor places to store drinking water, medicines and other heat-sensitive items.
The Bottom Line
A plastic water bottle left in a hot car does not automatically become poisonous, and drinking from it once does not mean that you will fall ill. However, prolonged exposure to high temperatures can increase the migration of certain substances from plastic into water.
The safest and simplest habit is to carry your water bottle with you, store it away from direct sunlight and replace the water if the bottle has become excessively hot.
Remember, a little care in storing drinking water can go a long way towards protecting your health!
