(NaturalHealth365)  Most people assume Parkinson’s disease is primarily genetic.  But, a major nationwide study published in Neurology in October 2025 challenges that assumption significantly.

Researchers at the Barrow Neurological Institute analyzed data from 221,789 people newly diagnosed with Parkinson’s and more than 1.1 million matched controls – all Medicare beneficiaries aged 67 and older.  They mapped each person’s residential exposure to a single industrial chemical and found a clear, dose-dependent pattern: the more exposure, the higher the risk.

The chemical is trichloroethylene, known as TCE.  Most people have never encountered the name, yet TCE contaminates air, soil, and groundwater across the United States.  A 2000 EPA report estimated that up to 30% of U.S. drinking water supplies contained TCE.  The EPA issued a ban on the chemical in 2024, then paused it in 2025.  As of now, TCE continues to circulate in industrial settings, the environment, and the bodies of millions of people.

What researchers found when they mapped TCE exposure across the country

People living in areas with the highest outdoor TCE concentrations faced a 10% greater risk of developing Parkinson’s compared to those in the lowest exposure areas.  The relationship followed a dose-response pattern – meaning higher exposure was consistently tied to higher risk, not just at the extremes.

Worth noting: Researchers adjusted for age, sex, race, smoking, healthcare utilization, and air pollution from fine particulate matter.  After all adjustments were made, the risk was still present.

Earlier research at Camp Lejeune, where service members drank TCE-contaminated water for years, found a 70% higher Parkinson’s risk in that exposed group.  A 2011 twin study found that occupational TCE exposure was associated with a 500% increase in risk.  The Neurology study adds nationwide ambient exposure to that body of evidence.

Why TCE is still in the air, water, and soil despite decades of concern

TCE entered widespread use in the 1920s as a dry cleaning and degreasing agent.  The FDA banned its use as an anesthetic in the 1970s.  Yet industrial use continued for metal degreasing, textile manufacturing, and other applications well into the 2000s and in some sectors through 2025.  Because TCE does not break down easily, decades of disposal and industrial release have left lasting contamination in groundwater and soil across the country.

The 2024 EPA ban would have eliminated all consumer and commercial uses.  Yet, the 2025 pause on that ban means current protections remain incomplete.

People living near former industrial sites, dry cleaners, or military bases face the highest ambient concentrations.  Yet TCE’s persistence in contaminated groundwater means the risk extends far beyond industrial neighborhoods.

Sadly, Western medicine does not screen for TCE exposure.  In fact, most physicians never look for this toxin in people.  Bottom line, the connection between this chemical and Parkinson’s risk sits largely outside the standard clinical conversation.

What people can do to reduce TCE exposure and support neurological health

Find out whether TCE affects your area: The EPA’s National Air Toxics Assessment database maps ambient toxic chemical concentrations by census tract.  People living near former industrial facilities, military bases, or dry cleaning operations face the greatest risk of exposure.  Checking local contamination records through the EPA’s Superfund site database is a practical first step.

Filter water and air actively: Activated carbon filtration effectively removes TCE from drinking water.  Standard pitcher filters do not – dedicated under-sink carbon block or reverse osmosis systems are required.  For indoor air, HEPA filtration combined with activated carbon captures volatile organic compounds, including chlorinated solvents that outgas from contaminated groundwater and building materials.

Support the liver’s detoxification capacity: TCE is metabolized in the liver via the cytochrome P450 system, producing reactive intermediates that induce oxidative stress.  Organic cruciferous vegetables – broccoli, Brussels sprouts, and watercress – activate phase II liver enzymes that process and neutralize these metabolites.  N-acetylcysteine supports glutathione production, the body’s primary defense against oxidative damage.  Milk thistle directly protects liver cells from chemical-induced injury.

Protect dopamine-producing brain cells proactively: TCE damages the mitochondria in dopamine-producing neurons – the precise cells lost in Parkinson’s disease.  Nutrients that support mitochondrial function include CoQ10, alpha-lipoic acid, and B vitamins, particularly B6, B12, and folate.  Reducing total toxic load through clean food, filtered water, and minimizing additional chemical exposures reduces the cumulative burden these cells carry.

Reduce other sources of chemical exposure simultaneously: TCE rarely operates in isolation.  Most people carry a mix of chlorinated solvents, heavy metals, pesticides, and plasticizers accumulated over the years from food, water, and air.  Each additional source adds to the total burden the nervous system carries.  Organic produce, glass or stainless-steel food storage, and avoiding synthetic fragrances all meaningfully reduce the chemical load that arrives at vulnerable brain tissue daily.

The Parkinson’s risk hiding in plain sight

Parkinson’s disease rates have risen steadily for decades.  Environmental neurotoxicants – chemicals that specifically damage brain cells – represent one of the most plausible explanations for that increase, and one of the least discussed in standard medical care.  TCE’s long latency period makes the connection hard to see in an individual patient.  By the time Parkinson’s symptoms appear, the exposure that contributed to them may be decades old.

Reducing toxic burden and supporting the body’s own detoxification systems are exactly the areas that Western medicine consistently overlooks.

Jonathan Landsman’s Whole Body Detox Summit brings together leading researchers, environmental health experts, and holistic physicians to examine which environmental exposures pose the greatest neurological and systemic risks and which evidence-based protocols most effectively reduce the body’s existing toxic load.

Editor’s note: If you’d like to support your detoxification pathways, consider purchasing LuvByNature’s LiverLuv – my top supplement recommendation for helping to remove toxins from your liver.

Sources for this article include:

NIH.gov
Sciencedaily.com
Usnews.com