If you caught Joe Rogan’s recent conversation with Dr. Shanna Swan on the Joe Rogan Experience, you already know the topic hit different. Swan is an environmental epidemiologist at the Icahn School of Medicine at Mount Sinai, and what she laid out over the course of that episode was hard to ignore: the plastics and chemicals woven into everyday life are quietly dismantling human reproductive health. Rogan shared the story of a friend who saw dramatic improvements in sperm count and testosterone after cutting plastics out of his life. Swan wasn’t surprised. She’s been documenting exactly that kind of outcome for over two decades.
The chemical at the center of most of this research is phthalates. Phthalates are synthetic compounds added to plastics to make them flexible and durable. They’re also potent endocrine disruptors, meaning they interfere with the body’s hormone system in ways that affect reproduction, development, metabolism, and more. The problem isn’t proximity to plastic. It’s that phthalates don’t stay bound inside it. They leach. And what they leach into often ends up in our bodies.
What the Research Shows
Swan has examined hundreds of studies and conducted her own, all pointing to sperm counts declining globally at roughly 1% per year, with that rate accelerating to over 2.6% when looking at studies published after 2000. Phthalates are among the primary suspects, with a documented anti-androgenic effect that lowers testosterone.
Her work began in earnest in the early 2000s after a conversation with a CDC chemist about what researchers call “phthalate syndrome,” a cluster of adverse reproductive outcomes tied to phthalate exposure during fetal development. She ran her own human study using urine samples from pregnant mothers and found that women with the highest phthalate levels were significantly more likely to have sons with markers of reproductive underdevelopment.
Her latest work has moved from observational research to direct intervention, working with individuals facing infertility and tracking what happens when they systematically reduce their chemical exposure. That work is now the basis of The Plastic Detox, a 2026 Netflix documentary in which Swan guides six couples through a 90-day reduction in plastic exposure. By the end, several couples saw major drops in chemical levels, with BPA falling to undetectable levels for many participants. Three of the six couples conceived.
The Water Connection
Most people aren’t testing their bottled water for phthalates. Most bottled water companies aren’t either. A 2025 review published in Environment International found that phthalate contamination exists across the full drinking water chain, from source water through treatment plants, distribution pipes, and into plastic bottles, with some municipal tap water concentrations documented far exceeding WHO guidelines in certain regions.
Storage conditions matter significantly. Temperature, sunlight exposure, time in storage, and the type of container all affect how much phthalate migrates from plastic into the water. That bottle sitting in a hot car or a warehouse in summer isn’t the same bottle that left the factory.
The same logic applies to everyday drink containers, Stanley cups, reusable tumblers, anything with a plastic liner. The EPA has set a maximum contaminant level for DEHP, one of the most common phthalates, in drinking water at 0.006 mg/L, with the FDA applying the same standard to bottled water. Many other phthalates remain unregulated despite growing concern about their endocrine-disrupting properties.
What You Can Do
The practical guidance is consistent across Swan’s research and the documentary: switch to glass or stainless steel, avoid heating anything in plastic, cut back on packaged and processed food, and choose fragrance-free personal care products.
But the single most effective thing you can do is take control of your own drinking water source and get off bottled water entirely. Bottled water is part of the problem, not the solution. It’s stored in plastic, often for months, and nobody is testing it for phthalates.
The better path is investing in the right home filtration system. The catch is that “the right system” depends entirely on what’s actually in your water. A filter that addresses chlorine byproducts won’t necessarily touch phthalates or heavy metals. That’s why general water testing comes first. You need to know what you’re dealing with before you can filter it out effectively.
As for cost, most people don’t do the math on what they’re already spending. Bottled water adds up fast, and a quality filtration system typically pays for itself within a few years when you run the numbers honestly. More importantly, it’s a small price to pay for improved quality of life and the peace of mind that comes with knowing exactly what you’re drinking every day.
At ETR Laboratories, we can help you figure out what’s in your water so you know what you actually need. Contact us for a free consultation at 978-840-2941 or browse our water testing options.
Sources
- Swan, S.H. Bulletin of the World Health Organization, 2025 — Environmental exposure to chemicals and their consequences for human fertility
- Environment International, 2025 — Chronic exposure to phthalates in drinking water
- Health and Environment Alliance — Dr. Shanna Swan on chemical pollution and declining fertility
- Netflix / TODAY — The Plastic Detox (2026)
- Joe Rogan Experience #2476 with Shanna H. Swan (March 2026)
