What can actually happen?
Bisphenol A, or BPA, is used to make certain polycarbonate plastics and epoxy resins. In polycarbonate packaging, small amounts of BPA can move from the material into food or drink. This transfer is called migration. BPA is therefore not created by water or automatically caused by a refill operation; its potential source is the material in contact with the water.
The statement ‘refill water in a reusable container must contain dangerous BPA’ is not supported merely because a container is reused. Risk assessment needs the material, container condition and use history, washing method, temperature, contact time, measured concentration, amount consumed, and the user's body weight.
When can migration increase?
Heat is an important factor. Research on polycarbonate drinking bottles found that boiling water could sharply increase the BPA migration rate. Hot washing, strongly alkaline cleaners, aggressive brushing, direct sunlight or a hot vehicle, and prolonged contact also need control because they can accelerate surface degradation or hydrolysis of polycarbonate.
Reuse alone is not proof that a container has become dangerous. In the same study, room-temperature migration did not differ significantly between new and used bottles. Even so, a cloudy, cracked, deformed, odorous, or heavily scratched container should not remain in service indefinitely. A reuse system needs clear acceptance, washing, inspection, and retirement criteria.
BPA numbers do not all measure the same thing
Indonesia's BPOM Regulation No. 11 of 2026 establishes migration-testing requirements for food packaging, including reusable plastic packaging. The specific BPA migration limit of 0.05 mg/kg is a packaging-compliance measure under defined test conditions—not a line above which illness is certain to begin. For water it is often approximated as about 50 micrograms per litre because one litre of water weighs close to one kilogram.
EFSA uses a different measure: a tolerable daily intake from all sources. In 2023 it set a TDI of 0.2 nanograms per kilogram of body weight per day, based mainly on an immune-system endpoint. The US FDA reached a different conclusion and continues to regard current levels in approved food-contact uses as safe. These differences should be disclosed: a migration limit, the concentration measured in water, and a person's daily dose must not be treated as though they were the same number.
Does BPA deposit and accumulate in the body?
BPA is not known to form permanent deposits like lead or calcium and is not considered strongly bioaccumulative in the classical sense. In a controlled human oral study, BPA was rapidly conjugated; its terminal half-life was about six hours, and most participants excreted more than 90 per cent of the dose as metabolites in urine within 24 hours.
Rapid elimination does not mean exposure can be ignored. With daily exposure, the body receives new doses repeatedly. Scientific concern centres on repeated exposure and sensitive stages such as pregnancy, infancy, and childhood—not on BPA forming a physical deposit in an organ.
Keeping the discussion scientific and fair
Consumers deserve an honest explanation: BPA migration is possible, but the existence of a hazard does not prove that every reusable water container creates the same risk. Any claim should disclose the material, analytical method and detection limit, units, sampling conditions, and benchmark used.
BPA should not be used to discredit refill systems, packaging producers, depots, or individual brands without verifiable evidence. Economic interests should likewise never be used to conceal risk. The position that best protects every party is transparent data, compliance, process improvement, and continuing evidence-based evaluation of packaging choices.
Reasonable steps for consumers and operators
- ✓Check the full material marking; resin code 7 means OTHER and indicates polycarbonate only when accompanied by PC.
- ✓Keep containers away from direct sun, hot vehicles, heat sources, and hot-water filling.
- ✓Reject containers that are cracked, cloudy, deformed, odorous, or heavily scratched.
- ✓Use food-grade washing procedures with controlled temperature, chemicals, contact time, and rinsing.
- ✓Assess refill safety as a complete system: source, treatment, hygiene, microbiology, packaging, storage, and filling point.
- ✓For BPA claims, request laboratory results that state the method, units, detection limit, sampling point, and test date.
The ARS perspective
ARS treats BPA as one element of Water Risk Management: packaging risk must be assessed together with the source, treatment, sanitation, storage, distribution, and use. Good water treatment must not be claimed to remove automatically a risk that may arise after the water enters its container. Consumer protection is built through data, process control, verification, and responsible communication—not fear or commercial interests.
Official references
- Indonesia BPOM — Regulation No. 11 of 2026 on Food Packaging
- Indonesia BPOM — Public explanation of BPA in packaged drinking water
- EFSA — Bisphenol A in food is a health risk (2023)
- FDA — Current perspective on BPA in food-contact applications
- PubMed — Human pharmacokinetics of BPA after oral administration
- PubMed — BPA migration from polycarbonate drinking bottles
This material provides general education. It does not replace laboratory testing, applicable local requirements, or a professional assessment of a specific water system.