Newer Groundwater and Carbonate Aquifers Linked to Increased Parkinson’s Risk

That moment when you fill a glass of water at the kitchen sink rarely feels like a potential health decision, but modern research linking groundwater characteristics to Parkinson’s disease risk is making Chicagoans pause right there at the tap. The study presented at the American Academy of Neurology Annual Meeting, led by Brittany Krzyzanowski, PhD of the Barrow Neurological Institute, found that odds for developing Parkinson’s increased with newer groundwater and specifically in areas relying on carbonate aquifers. While the research didn’t single out Chicago, the city’s unique geological setting—sitting atop layers of glacial till over Silurian dolomite bedrock, a classic carbonate aquifer system—means this finding hits unusually close to home for residents from Evanston to the South Shore.

To understand why this matters locally, we need to look beneath our feet. Chicago’s drinking water primarily comes from Lake Michigan, treated and distributed by the City of Chicago Department of Water Management. However, a significant portion of the metropolitan area, especially in the western and southern suburbs, relies on deep sandstone and carbonate aquifers for municipal or private well water. Communities like Joliet, which famously announced a shift away from deep aquifer dependence due to declining water levels, or Elgin, drawing from both the Fox River and deep wells, sit directly over the kind of geology the study flagged. The “newer groundwater” aspect refers to water that has recharged the aquifer more recently, potentially carrying surface contaminants downward faster—a concern amplified in regions with intensive agriculture or urban runoff, patterns visible across Illinois’ vast farm belt feeding into the Mississippi watershed.

This isn’t just about geology. it’s about layered vulnerability. Historically, industrial corridors along the Calumet River and the old steel mill zones of Southeast Chicago left legacies of heavy metals and solvents in the soil. While modern treatment handles known contaminants, the study suggests we might need to look at water age and aquifer type as additional risk factors—almost like a geological fingerprint influencing susceptibility. Emerging trends in environmental neurology point to the exposome—the totality of environmental exposures—as critical in neurodegenerative diseases, shifting focus beyond genetics alone. For Chicago, In other words considering how decades of land use, from the old stockyards to current logistics hubs around the I-55/I-57 interchange, interact with our subsurface hydrology. The socio-economic ripple is subtle but real: communities already facing environmental justice challenges, often located near historical industrial sites and potentially relying on vulnerable aquifers, could spot compounded risks, adding another dimension to discussions about equitable public health infrastructure.

Given my background in environmental epidemiology and urban health systems, if this groundwater-Parkinson’s link resonates with your concerns about long-term water safety in Chicagoland, here are three types of local professionals whose expertise becomes invaluable:

• Hydrogeologists Specializing in Urban Aquifer Systems: Look for consultants or firms (often affiliated with university programs like those at the University of Illinois Chicago or Illinois State Water Survey) who don’t just map aquifers but understand Chicago’s complex glacial geology, carbonate bedrock behavior, and how urban infrastructure (like leaky sewers or old foundations) interacts with groundwater flow and age. They should be able to interpret isotopic data (like tritium/helium-3) to assess water “newness” and identify potential preferential flow paths for contaminants.
• Environmental Health Scientists with Neurotoxicology Focus: Seek professionals, possibly within academic medical centers like Northwestern University Feinberg School of Medicine or Rush University Medical Center, or specialized consultancies, who bridge exposure science and neurology. Their criteria should include familiarity with Parkinson’s disease pathophysiology, experience designing or interpreting biomonitoring studies (looking for biomarkers in urine or blood linked to neurotoxicants), and understanding how to assess cumulative exposure from multiple sources (water, air, diet) within an urban context like Chicago’s.
• Municipal Water Policy Analysts Focused on Infrastructure Equity: These aren’t just engineers; they’re experts often found in agencies like the Metropolitan Planning Council (MPC), the Chicago Metropolitan Agency for Planning (CMAP), or environmental non-profits (such as the Alliance for the Great Lakes) who analyze how water source decisions, infrastructure investments, and treatment upgrades impact different neighborhoods. Look for those who explicitly integrate geological vulnerability maps with socio-economic data to advocate for equitable protection—prioritizing not just compliance, but proactive measures like targeted aquifer monitoring or wellhead protection plans in carbonate-rich, older suburbs.

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