"Forever chemicals," the nickname for per- and polyfluoroalkyl substances, or PFAS, have earned their name for a reason. These synthetic compounds resist breaking down in the environment and in the human body. Used for decades in non-stick cookware, food packaging, waterproof clothing, stain-resistant fabrics, firefighting foams and some personal-care products, they have spread into soil, food, and, critically, drinking water supplies around the world, including across Australia.
Trace levels of common PFAS such as PFOS, PFOA and PFHxS are routinely detected in municipal tap water at concentrations that current Australian Drinking Water Guidelines still regard as acceptable. In June 2025 the National Health and Medical Research Council tightened those guideline values (PFOS to 8 ng/L, PFHxS to 30 ng/L, PFOA to 200 ng/L), yet researchers continue to question whether "safe" under existing rules is truly safe for the most vulnerable stages of human development.
The Adelaide University mouse study that sparked the advice
In April 2026 a team at the University of Adelaide's Robinson Research Institute published findings that directly fuelled media coverage. Lead author Dr Yasmyn Winstanley and senior author Professor Rebecca Robker exposed female mice to drinking water containing PFAS at the low concentrations measured in Adelaide tap water, levels within current regulatory limits. Exposure lasted either four weeks or six months.
Even the shorter period produced measurable harm: fewer cells in developing embryos, impaired cellular function, elevated DNA damage, and reduced embryo viability. Longer exposure amplified the effects and lowered foetal weight in offspring. Most striking, the damage appeared to persist across generations, visible in the daughters and granddaughters of the originally exposed mice. The effects were not reversed by stopping exposure or by antioxidant treatment. Carbon filtration of the same water, however, removed the PFAS and protected the embryos.
Professor Robker stated: "Even the very low levels that are present in drinking water do have detectable effects." Dr Winstanley noted surprise that such trace amounts could harm embryos and called for greater attention to water-quality guidelines. Both researchers emphasised that couples hoping to start a family should consider filtering their tap water, and that everyone would benefit from limiting PFAS exposure more broadly.
The study is preclinical (mice, not humans). Animal models cannot perfectly predict human outcomes, yet they can reveal biological mechanisms: mitochondrial disruption, DNA damage, intergenerational transmission, that align with a growing body of human epidemiological evidence.
What human studies show about PFAS, fertility and pregnancy
Multiple human studies link higher PFAS blood levels to reduced fertility. A 2023 Mount Sinai analysis of women trying to conceive found that higher mixture concentrations of several PFAS were associated with 30–40 % lower odds of clinical pregnancy and live birth within a year. Other research has associated PFAS with altered hormone levels, menstrual-cycle disruption, diminished ovarian reserve, poorer outcomes in assisted reproduction, and, during pregnancy, increased risks of preeclampsia, foetal growth restriction and preterm birth.
PFAS cross the placenta and appear in breast milk, so exposure continues into early life. Public-health agencies in several jurisdictions already advise pregnant people and those preparing infant formula to consider treated or bottled water if local supplies contain elevated PFAS.
Practical steps for couples planning a pregnancy
Complete avoidance of PFAS is unrealistic in modern life, but meaningful reduction is achievable:
Filter drinking and cooking water. Activated-carbon filters (granular or block) can remove or substantially reduce many common PFAS compounds, as confirmed in the Adelaide study and by independent testing. Look for systems certified under NSF/ANSI standards for PFOA/PFOS reduction; reverse-osmosis systems are generally even more effective. Replace cartridges on schedule.
Reduce other everyday sources. Prefer stainless-steel, cast-iron or ceramic cookware over non-stick. Limit food packaged in grease-resistant paper or plastic. Choose personal-care and cleaning products without "fluoro" or "PTFE" ingredients when possible. Wash new waterproof clothing before first use.
PFAS contamination is a classic slow-moving public-health challenge: useful chemistry, long environmental persistence, ubiquitous low-level exposure, and health effects that become clearer only with better study designs. The Adelaide findings add experimental weight to the epidemiological signals already linking these chemicals to reproductive harm. They also demonstrate a practical household intervention, carbon filtration, that works.
For couples planning a family, the scientist-backed message is straightforward: filtering your drinking water is a low-cost, evidence-supported step that can meaningfully lower one important source of PFAS exposure at a critical life stage. It will not eliminate every risk, but it is one concrete action within individual control.