People Near Fracking Wells Show Higher Hospitalization Rates


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A flare at a fracking site near a home in Colorado.

©WildEarth Guardians via Flickr CC

Over the past ten years in the United States, unconventional gas and oil drilling using hydraulic fracturing, or fracking, has experienced a meteoric increase. Since well drilling requires an influx of water, materials and workers into otherwise rural and remote areas, the question has been: could air, water and noise pollution negatively impact on the health of nearby residents?

A study published last year suggested that hydraulic fracturing and proximity to active well drilling are associated with congenital heart disease and low birth weight newborns.

In research from the University of Pennsylvania and Columbia University published this week in PLoS One, my colleagues and I found that hospitalizations for heart conditions, neurologic illness and other maladies were higher among people who live near unconventional gas and oil drilling.

The finding suggests that these people are exposed to stressors, such as toxic substances and noise, that can lead to a higher rates of hospitalizations.

Active wells

To address the question of whether hydraulic fracturing is associated with health consequences, researchers from two Environmental Health Science Core Centers (EHSCC) of the National Institute of Environmental Health Sciences – the Center of Excellence in Environmental Toxicology (CEET) at the University of Pennsylvania’s Perelman School of Medicine and the Center for Environmental Health at Columbia’s Mailman School of Public Health – examined the link between drilling well density and healthcare use by zip code from 2007 to 2011 in three northeastern Pennsylvania counties.

Examining over 198,000 hospitalizations (some include multiple hospitalizations for the same person), the team addressed the top 25 specific medical categories for hospitalizations, as defined by the Pennsylvania Health Costs Containment Council.

Our analysis showed that hospitalization rates were associated with residents’ proximity to active wells.

In Bradford and Susquehanna Counties, there was a significant increase in drilling activity over the study period while a control county, Wayne, had no drilling activity due to a ban on hydraulic fracturing in the county because of its proximity to the Delaware River watershed.

As reported in PLoS One, cardiology and neurology inpatient prevalence rates (the proportion of a population found to have been hospitalized per 100 residents per year) were significantly higher in areas closer to active wells.

A typical drill pad, such as this one in Pennsylvania, entails regular traffic of heavy trucks to deliver water and other materials. ©US Geological SurveyIn addition, increased neurologic inpatient prevalence rates were associated with higher well density. Hospitalizations for skin conditions, cancer and urologic problems were also associated with the proximity of dwellings to active wells.

The team found that 18 zip codes had a well density greater than 0.79 wells per square kilometer, and that residents living in these zip codes were predicted to have a 27% increase in cardiology inpatient prevalence rates for each that well density occurred over the five-year interval. These rates were compared to the control county (Wayne) in which residents did not experience such an increase, and there was no active drilling.

Cost of health care

These data clearly demonstrate an association of active well density with increasing some but not all causes of hospitalization. The precise reason or reasons for the increase in hospitalizations remains unclear.

Several important toxicants such as noise and air pollution from diesel exhaust from, for example, higher local truck traffic, as well as social stress likely contribute to the increased incidence of hospitalizations. At this time, the specific toxicant or combinations that increase hospitalization rates remain unclear.

Importantly, this is the first comprehensive study to link hospitalization rates and well density and focuses attention on specific medical illnesses that could be linked to hydraulic fracturing. Further studies will examine whether emergency department or outpatient visits are also associated with active well drilling. Personalized monitoring of specific toxicants in future studies may also provide clues as to causation.

While the study cannot prove that hydraulic fracturing actually causes health problems, the hospitalization increases observed over a relatively short time span of observation suggests that health care costs of hydraulic fracturing must be factored into the economic benefits of unconventional gas and oil drilling.

Reynold A Panettieri Jr is an Adjunct Professor of Medicine at the University of Pennsylvania.

See also:
Fracking Boon Spurs Both Profits and Dangers
Exposure To Pollution Likely Driving An Increase In Dementia

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