Polycarbonate is approved for food contact by the FDA, but it comes with a caveat that matters: it contains bisphenol A (BPA), a chemical that can leach into food and drinks, especially when heated. Whether that leaching poses a real health risk depends on how much BPA actually migrates into your food and how you use the container. The FDA says current exposure levels are safe. Europe’s food safety authority disagrees sharply, having lowered its acceptable exposure limit by 20,000-fold in recent years.
What Polycarbonate Is and How to Spot It
Polycarbonate is a hard, clear plastic used in reusable water bottles, food storage containers, and some kitchen appliances. It’s durable, lightweight, and resistant to impact, which is why it became so popular for drinkware and food containers in the first place.
You can identify polycarbonate by checking the recycling symbol on the bottom of a container. It falls under recycling code 7, the catch-all “Other” category that includes polycarbonate, bio-based plastics, and other miscellaneous resins. Some polycarbonate items also carry a “PC” marking near the recycling symbol. Not every code-7 plastic is polycarbonate, but if you see “PC” or code 7 on a clear, rigid container, there’s a good chance it is.
Why BPA Is the Central Concern
BPA is a building block of polycarbonate. The polymer chains that make up the plastic are held together by chemical bonds called carbonate linkages. Under certain conditions, those bonds break down through a process called hydrolysis, releasing BPA from the plastic surface into whatever food or liquid is inside. There are two sources of BPA in your food: residual BPA left over from manufacturing that didn’t fully bond into the plastic, and BPA that breaks free when the plastic degrades over time.
BPA mimics estrogen in the body. It can interfere with hormone signaling, which is why it’s classified as an endocrine disruptor. Research has linked high BPA exposure to a range of reproductive health problems. In men, that includes altered sperm quality, changes in reproductive hormone levels, and testicular damage. In women, associations have been found with hormonal imbalances, reduced ovarian reserve, and higher rates of conditions like polycystic ovarian syndrome, endometriosis, and fibroids. These findings come primarily from studies examining people with elevated exposure, not typical dietary levels, which is where the regulatory debate gets complicated.
What Regulators Actually Say
The FDA maintains that BPA is safe at the levels people currently encounter through food packaging. That position is based on a four-year review of more than 300 scientific studies, completed in 2014, plus ongoing monitoring since then. The agency has not revised its safety assessment and continues to permit BPA-based polycarbonate in food containers for adults.
Europe tells a different story. The European Food Safety Authority originally set its tolerable daily intake for BPA at 0.05 milligrams per kilogram of body weight in 2006. It lowered that to 4 micrograms per kilogram in 2015. Then, in 2023, it dropped the limit dramatically to 0.2 nanograms per kilogram of body weight, identifying the immune system as particularly sensitive to BPA. That final limit is 20,000 times lower than the 2015 figure. Some toxicologists have pushed back on the methodology behind this reduction, but the gap between the FDA’s position and EFSA’s current threshold is enormous.
California listed BPA as a chemical known to cause reproductive toxicity under Proposition 65 in 2015, which means products sold in California that expose consumers to BPA may require warning labels.
Heat and Time Increase Leaching
Temperature is the single biggest factor that determines how much BPA migrates from polycarbonate into your food or drink. When polycarbonate is exposed to high heat, the carbonate linkages that hold the polymer together are more vulnerable to breaking apart. The spacing between polymer chains increases, making it easier for BPA molecules to escape. Hot water in a polycarbonate bottle is enough to trigger this hydrolysis.
Longer contact time also matters. The combination of high temperature and extended exposure accelerates BPA migration, because the plastic has more time to degrade and release unreacted monomers. That said, the research picture isn’t perfectly clean. Some studies show a clear temperature-dependent increase in BPA concentration, while others have found the relationship isn’t always linear. Storage conditions, the age of the container, and how many times it’s been heated and cooled all play a role.
The practical takeaway: if you use polycarbonate containers, avoid putting hot liquids in them, don’t microwave them, and don’t run them through the dishwasher repeatedly. Each heat cycle degrades the plastic surface a little more.
Baby Bottles Are a Special Case
Polycarbonate baby bottles have been phased out across most of the developed world. Canada prohibited the import and sale of polycarbonate baby bottles and children’s drinking cups containing BPA in 2010. The European Union followed with its own ban on polycarbonate in infant feeding bottles. The FDA amended its regulations to no longer authorize BPA-based polycarbonate in baby bottles, sippy cups, or packaging for infant formula.
The FDA was careful to note that these regulatory changes were based on “abandonment,” meaning manufacturers had already stopped using BPA in those products voluntarily, not on a formal safety finding. Regardless of the legal reasoning, the outcome is the same: polycarbonate baby bottles are effectively off the market in the U.S., Canada, and Europe. If you’re buying baby bottles today, they will almost certainly be BPA-free.
BPA-Free Alternatives
The most common replacement for polycarbonate in reusable bottles and food containers is a copolyester sold under the brand name Tritan. Introduced in 2007, Tritan is made from a completely different set of chemical building blocks and does not contain BPA as a structural component. Migration testing has shown that Tritan has low leaching potential overall. In one comparison study, trace amounts of several compounds were detected migrating from Tritan, but all fell well below regulatory safety limits. By the third round of testing, only two compounds were still detectable, and both were far under the allowed thresholds.
Other alternatives include polypropylene (recycling code 5), which is widely used in food containers and considered one of the safest common plastics, and stainless steel or glass, which don’t leach any plastic-related chemicals at all. If avoiding BPA is a priority, these are the most straightforward options.
Practical Steps to Reduce BPA Exposure
- Check the recycling code. Avoid code 7 containers unless they’re specifically labeled BPA-free. Code 5 (polypropylene) and code 1 (PET) containers don’t contain BPA.
- Keep polycarbonate away from heat. Don’t microwave it, don’t pour boiling water into it, and hand-wash it in warm (not hot) water instead of using the dishwasher.
- Replace old or scratched containers. Surface damage exposes more of the plastic to food and liquid, increasing the opportunity for BPA to leach out.
- Use glass or stainless steel for hot liquids. Neither material releases any plastic-derived chemicals, regardless of temperature.
- Look for “BPA-free” labels. Most major brands of reusable bottles and food storage containers have switched to BPA-free materials, but it’s worth confirming on the packaging.