Every so often we get the chance to share something that can genuinely help the planet—especially if even a fraction of readers put it into practice. Simple actions, like carrying reusable shopping bags or collecting rainwater, add up. This is one of those moments. Please feel free to pass this information along to friends and family.
We owe this insight to my very smart younger brother Dan, affectionately known as Almost-Doctor Dan.
As a quick refresher: Dan attended Cornell, graduating at the top of his class, and is now a graduate student at Columbia working toward a doctorate in chemistry with support from the National Science Foundation. He studies molecules, polymers, and environmental chemistry, and he shared some important, counterintuitive information about antibacterial soap that’s worth repeating.
In short: the “antibacterial” label on many soaps is largely marketing, and it can have real environmental consequences. Here’s Dan’s explanation in plain terms:
Many antibacterial soaps rely on a chlorinated aromatic compound called triclosan. Triclosan itself isn’t especially toxic to humans at the levels we encounter in soap, but it does end up in wastewater every time we wash our hands. Over time it accumulates in lakes, rivers, and coastal waters, because it’s not readily biodegradable. Think about how fast a bottle of hand soap disappears—every rinse sends a bit of that active ingredient down the drain. Multiply that by millions of users and the environmental load becomes significant.
Importantly, antibacterial soaps aren’t necessary for routine hand hygiene. Healthy, intact skin is an effective barrier—the main way pathogenic bacteria on your hands cause illness is if they’re transferred to your mouth, nose, or eyes or if you ingest contaminated food. Any regular soap and mechanical washing removes bacteria by dislodging and breaking down cell membranes. In other words, ordinary soap and water will clean your hands just as effectively for everyday use. Unless you need sterile conditions, as in a surgical setting, antibacterial soaps are an unnecessary expense and an avoidable environmental burden.
This idea surprised many of us. Companies market antibacterial products as superior, but for most households regular soap and thorough washing do the job without introducing persistent chemicals into the environment. Adopting simple habits—wash hands properly, for the recommended duration and technique—reduces pollutants and protects waterways.
We also heard from another Almost-Doctor, Kristin, who is pursuing her PhD in Germany and works with bacteria regularly. She added a microbiologist’s perspective:
Bacteria are everywhere; most are harmless or beneficial. When you wash with antibacterial or disinfectant soaps, the bacterial population on your skin typically returns to normal within hours to a day. Overuse of disinfectants can damage beneficial skin flora, which can lead to skin irritation or increased susceptibility to infection when the skin barrier is compromised. Thinking of bacteria as a normal part of our environment, rather than something to eradicate completely, is important.
Overuse of antibacterials also carries a public-health risk: excessive disinfectant exposure can select for resistant strains of bacteria. Some researchers also suggest that overly sterile household environments may contribute to allergies, because the immune system needs regular exposure to environmental microbes to develop properly.
Practically speaking, washing with water and soap removes or kills about 99% of bacteria. If you want to minimize soap use, a damp microfiber cloth can pick up microbes effectively; launder that cloth in hot water afterward to sanitize it. For most healthy households, these simple methods are sufficient.
So the consensus from two scientists working on different continents is clear: skip antibacterial household soaps and rely on good old soap and water. It protects your health and reduces chemical pollution in lakes, rivers, and oceans. John and I prefer plant-based, minimally processed soaps when we can. For those looking to replace antibacterial products, castile-style soaps made from organic oils are widely available and tend to have a smaller environmental footprint, especially when packaged responsibly.
In short: thorough handwashing with regular soap and water is effective for everyday use, better for the environment, and helps avoid contributing to antimicrobial resistance and persistent chemical pollution. Small changes in household purchasing and washing habits—multiplied across communities—can make a measurable difference over time.
If you want additional reputable sources, consult public health agencies and peer-reviewed summaries on hand hygiene and triclosan, which corroborate the practical guidance shared here.