
Plastic water containers are a convenient way to store and transport water, but are they safe for our health? The short answer is yes, some plastics are considered safe. However, it's important to know what to look out for. Most reusable plastic water bottles have numbers engraved on the base, which can help identify if they are safe. Generally, plastics with the Resin Identification Code (RIC) or recycling numbers 1, 2, 4, and 5 are considered safe and BPA-free. Plastics with other numbers, such as 3, 6, and 7, are best avoided as they may contain harmful chemicals like phthalates, styrene, and bisphenols (BPA). Heating plastic or exposing it to sunlight and hot liquids can also cause it to leach chemicals, so it's important to avoid reusing single-use plastic bottles and check the type of plastic before use.
| Characteristics | Values |
|---|---|
| Plastic water containers safe to use | PET, HDPE, LDPE, PP |
| Plastic water containers unsafe to use | PVC, Polystyrene, Styrofoam, Plastic 3, Plastic 6, Plastic 7 |
| Plastic water containers safe numbers | 1, 2, 4, 5 |
| Plastic water containers unsafe numbers | 3, 6, 7 |
| Plastic water containers safe for reheating | LDPE, PP |
| Plastic water containers unsafe for reheating | PVC |
| Plastic water containers safe for freezing | PET |
| Plastic water containers safe for children | N/A |
| Plastic water containers with health risks | PVC, Plastic 3, Plastic 6, Plastic 7 |
| Plastic water containers with chemicals | PET, PVC, Plastic 3, Plastic 6, Plastic 7 |
| Plastic water containers with bacteria and fungi | All plastic water containers |
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What You'll Learn

Safe plastics are labelled with numbers 1, 2, 4 and 5
Plastic is everywhere, and it seems almost impossible to escape in the modern consumer world. However, some plastics are safer than others, and it is crucial to understand the potential harm of the elements of different plastics.
Plastics labelled with the recycling numbers 1, 2, 4 and 5 are considered safe for use. Number 1 plastic, or PET, is commonly used for water or soda bottles, detergent containers and peanut butter jars. It is safe for use and is widely recycled. Number 2 plastic, or HDPE, is another safe plastic that is often used for milk or water jugs, laundry detergents and shampoo bottles. It is very hard-wearing and does not break down under exposure to sunlight or extreme temperatures. Number 4 plastic is also considered safe for use and does not contain BPA. Number 5 plastic is also relatively safe to use.
On the other hand, plastics labelled with the numbers 3, 6 and 7 are best avoided. Number 3 plastic, or PVC, is dubbed the "poison plastic" due to the toxins it can leach throughout its life cycle. Number 6 plastic contains styrene, which is linked to an increased risk of cancer, especially for those exposed to high levels. Number 7 plastic is a mixed variety of other plastics, which are hard to recycle and may contain BPA or bisphenol A.
While plastic containers have been criticised for their potential health risks, the FDA has determined that bottled water containers do not pose a health risk to consumers. Boiling and filtering tap water can also reduce the amount of microplastics present. However, it is recommended to minimise the use of plastic around food and to replace plastic with glass or stainless steel to reduce exposure to potentially harmful chemicals.
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Heating plastic causes it to leach chemicals
There is mounting evidence that plastic leaching into our food and drinks is a health hazard. Heating plastics in the microwave may cause chemicals to leach into your food and drinks. This process can be sped up when food or drinks are microwaved in plastic containers.
Harmful chemicals can leach into foods from plastic containers or cans with plastic lining. Research has found that more than 90% of bottled water from the world's leading brands was contaminated with microplastics. This has sparked a review of plastics in drinking water by the World Health Organization. The main cause for concern is that these chemicals can interfere with our hormones.
The widespread use of plastics has resulted in a high accumulation of plastic waste in the environment. After exposure to biotic and abiotic processes, plastics break down into small fragments. When heated, disposable plastic materials are very likely to release microplastic particles and harmful substances. For example, organic chemicals and heavy metals were detected in leachate from heat-treated plastics.
To reduce exposure to chemicals in food, it is recommended to eat fresh fruits and vegetables when possible and to avoid plastic storage containers with chemicals that can leach into food. It is also advised to avoid microwaving food or drinks in plastic containers, as heating food containers increases the release of chemicals into food.
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Plastic #7 may contain BPA, a hormone-disrupting chemical
Plastic is everywhere, from food packaging to phone cases. While some types of plastic are considered safe, others may contain harmful chemicals that can leach into food and drinks, especially when heated. One such chemical is bisphenol-A (BPA), a hormone-disrupting chemical found in certain types of plastic.
BPA is a synthetic estrogen that can interfere with the body's endocrine system, which regulates hormones. This interference can have adverse health effects, particularly during critical phases of development, such as childhood and pregnancy. Fetuses are especially vulnerable to the impacts of endocrine disruptors like BPA.
BPA is commonly found in rigid plastic products, food and formula can linings, dental sealants, and the shiny side of receipts. It is also present in polycarbonate plastic, which has been used for food and beverage containers for many years due to its lightweight, shatter-resistant, and transparent properties. While the FDA and other regulatory agencies have deemed BPA safe for consumer use, some studies suggest that it may be linked to health issues such as cancer, obesity, and endocrine problems in fetuses and children.
Plastic #7, also known as polycarbonate or PC #7, is a type of plastic that may contain BPA. It is identified by the recycling symbol #7 on the packaging and is often used for mixed plastics items like lids, medical storage containers, sports drink bottles, and large water jugs. While the FDA removed BPA from baby bottles and children's products in 2012, it is important to check other plastic products for the presence of BPA to minimize potential health risks.
To avoid exposure to BPA and other harmful chemicals, it is recommended to use alternative materials like glass, porcelain, enamel-covered metal, or stainless steel for food and beverage containers, especially when heating food. Additionally, choosing fresh, frozen, or dried foods over canned goods can help reduce exposure to BPA-lined cans.
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Microplastics are found in the environment and enter the human body through drinking water
Plastic pollution is a growing concern, and microplastics have been found in every ecosystem on Earth, from the Antarctic tundra to tropical coral reefs. These particles are 5mm or less in length, smaller than a sesame seed, and can break down into even smaller nanoplastics, which are less than 1 μm in size. These particles are so small that they can enter the body's cells and tissues.
Microplastics have been detected in food, beverages, and human and animal tissue. They are present in the air, soil, and water, and therefore drinking water is one of the ways in which microplastics enter the human body. While bottled water is one source of drinking water packaged in plastic containers, tap water also often comes into contact with plastic through filters and other parts of a fridge.
Research has found evidence of plastic particles in human blood, lungs, gut, feces, and reproductive tissues. However, the potential health effects of these tiny plastic bits are still unknown. The small size of nanoparticles makes them difficult to detect and study, and there is currently no scientific consensus on their potential health impacts.
Some types of plastic are considered safer than others. For example, PET plastic, commonly used for water bottles, does not contain bisphenol A (BPA) and is deemed safe by the FDA. HDPE, another plastic used for bottled water, is also considered safe and is not known to transmit chemicals into food or drinks. On the other hand, plastics with the Resin Identification Code (RIC) of 3, 6, and 7 are best avoided due to the presence of phthalates, styrene, and potential BPA, respectively.
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PVC plastic is known to contain toxic chemicals
Plastic water containers have been criticised for their potential health risks. However, it is important to note that the US Food and Drug Administration (FDA) has set rules and guidelines regarding the safety of packaging materials that come into contact with food and beverages. According to the FDA, containers used by the bottled water industry are safe and do not pose a health risk to consumers. Nevertheless, it is worth exploring the concerns regarding PVC plastic, which is known to contain toxic chemicals.
PVC, or polyvinyl chloride, is the third most common plastic manufactured globally. It is used in a variety of products, from flooring and shower curtains to water pipes and children's toys. PVC is toxic at every stage of its production and disposal, and its use has been linked to health and environmental harm. One of the primary building blocks of PVC is vinyl chloride, a potent carcinogen and one of the most commonly released industrial chemicals. The production of PVC involves the use of toxic and volatile chemicals, such as chlorine gas, PFAS, asbestos, or mercury.
PVC microparticles have been shown to have toxic effects on reproduction in model organisms. Studies have found that exposure to PVC microparticles can decrease reproduction efficiency, delay hatching periods, induce oxidative stress, and cause changes in gene expression related to reproduction and detoxification. Additionally, PVC is known to leech harmful chemicals, even if it is in small amounts. This leeching can occur when PVC comes into contact with water or other liquids, potentially contaminating the contents.
The disposal of PVC is also a concern. When PVC degrades, it can release toxic chemicals into the environment. One study found that PVC microparticles showed higher acute and genetic toxicities under light irradiation compared to dark conditions. This indicates that PVC can pose ecological risks, especially in surface waters. The presence of humic acid, which is common in rivers, further enhances the biotoxicity of the chemicals leaching from PVC.
While there are safer alternatives to PVC, the powerful vinyl lobby and the economics of oil and gas production have made it challenging to eliminate its use. However, it is important to note that other plastics, such as PET and HDPE, are considered safer alternatives that do not transmit chemicals into foods or drinks. Overall, while PVC plastic is known to contain toxic chemicals, there are ongoing efforts to find viable alternatives and reduce its use.
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Frequently asked questions
Plastic water containers are generally safe for storing water, but it's important to look out for the Resin Identification Code (RIC) or recycling number at the bottom of the container. Numbers 1, 2, 4 and 5 are considered safe, while numbers 3, 6 and 7 should be avoided due to potential health risks.
Some plastics contain harmful chemicals such as phthalates, styrene and bisphenols (including BPA) which can leach into the water over time, especially when exposed to heat. These chemicals have been linked to various health issues, including cancer, liver damage, thyroid problems and reproductive issues.
To reduce your exposure, look for containers with RICs labelled 1, 2, 4 or 5, as these types of plastic are considered safer. Avoid reusing single-use plastic bottles, as this can increase the risk of chemical leaching. Also, avoid heating plastic containers in the microwave, as heat can cause chemicals to migrate into the food or water.
Yes, you can use glass, stainless steel or bamboo containers as alternatives to plastic. These materials are less likely to leach harmful chemicals and are more environmentally friendly.











































