Fracking is controversial because it sits at the intersection of several competing concerns: economic growth and energy independence on one side, and risks to drinking water, public health, air quality, and climate stability on the other. The debate is further fueled by regulatory gaps that leave many of these risks poorly monitored. Here’s a closer look at each point of tension.
What Fracking Actually Involves
Hydraulic fracturing, or fracking, is a method for extracting oil and natural gas trapped in rock formations deep underground. Wells are drilled hundreds to thousands of feet below the surface, often with horizontal sections extending thousands of feet further. Operators then pump large volumes of fluid at high pressure into the rock to crack it open. The fluid is mostly water, mixed with sand or ceramic particles (called proppant) that wedge into the new fractures and hold them open so gas and oil can flow out.
The fluid also contains a long list of chemical additives: acids to dissolve minerals, biocides to kill bacteria, friction reducers, scale inhibitors, and surfactants. Some of these chemicals, like methanol, toluene, and hydrochloric acid, are hazardous on their own. Once the pressure is released, fluid flows back to the surface carrying not only those injected chemicals but also naturally occurring substances from deep underground, including heavy metals, radioactive materials, and concentrated salts. This “flowback” is stored in tanks or open pits on site before being treated, recycled, or disposed of.
Concerns About Drinking Water
One of the most persistent worries is what happens to groundwater. A single fracked well can use anywhere from 1.5 million to 16 million gallons of freshwater, depending on the geology and well design. That volume alone raises concerns in drought-prone regions. But the bigger fear is contamination: if well casings fail or fractures extend beyond the target formation, fracking chemicals and methane can migrate into aquifers that supply drinking water.
Adding to the concern is a notable regulatory gap. The EPA currently lacks authority under the Safe Drinking Water Act to regulate most hydraulic fracturing operations. This exemption, sometimes called the “Halliburton Loophole,” means the underground injection of fracking fluid is not subject to the same federal oversight that applies to other types of industrial injection wells, except in cases where diesel fuel is used. Many states have their own rules, but the patchwork nature of regulation leaves critics arguing that no one is adequately watching the water supply.
Links to Earthquakes
Fracking itself can cause small seismic events, but the bigger earthquake risk comes from what happens to the wastewater afterward. Much of the flowback fluid is disposed of by injecting it into deep underground wells. Geologists have recognized since the 1960s that this kind of fluid injection can trigger earthquakes by raising pressure along existing faults, essentially pushing the two sides of a fault apart enough to let the crust slip.
A large-scale study found that wastewater disposal wells were 1.5 times more likely to be associated with earthquakes than other types of injection wells. The link was strongest at high injection rates, above about 300,000 barrels per month. Oklahoma became a dramatic case study: the state’s earthquake activity surged in areas where disposal rates had skyrocketed alongside the shale boom. Before 2009, Oklahoma averaged one or two magnitude-3.0 earthquakes per year. By 2015, it was experiencing hundreds. Researchers have proposed that limiting injection rates could reduce earthquake hazard, but enforcement varies widely.
Health Risks for Nearby Residents
A growing body of research has found health effects associated with living close to fracking operations. A study published in JAMA Pediatrics examined birth outcomes for people living within about six miles (10 km) of hydraulically fractured wells. After adjusting for factors like parental age, socioeconomic status, and pre-existing conditions, researchers found that proximity to fracking was associated with a 12% increase in babies born smaller than expected for their gestational age and a 31% increase in major birth defects.
The risks climbed with greater exposure. People living near 100 or more wells within that six-mile radius had a 64% higher risk of spontaneous preterm birth and a 65% higher risk of undersized newborns. Exposure during both preconception and pregnancy was linked to a 19% increase in severe complications for newborns, including serious illness or death. These findings don’t prove fracking directly caused the outcomes, but the pattern has been consistent enough across multiple studies to raise serious alarm among public health researchers.
The Climate Paradox
Natural gas burns cleaner than coal at the point of combustion, producing roughly 40% less carbon dioxide per unit of electricity generated. This has led proponents to frame fracking as a “bridge fuel” that helps transition away from dirtier energy sources. And in practice, cheap natural gas from fracking has displaced a significant amount of coal-fired power generation in the U.S.
The problem is methane. Natural gas is primarily methane, and methane is roughly 80 times more potent than carbon dioxide as a greenhouse gas over a 20-year period. If enough methane leaks during drilling, processing, and transport, the climate advantage over coal shrinks or disappears entirely. The federal government has estimated that methane emissions from oil and gas facilities average about 1% of total gas production. But a 2024 Stanford analysis of actual measurements found the real average is closer to 3%, with some regions far worse. In the New Mexico portion of the Permian Basin, nearly 10% of all methane produced in 2019 escaped directly into the atmosphere. At leak rates that high, the climate benefit of switching from coal to gas becomes questionable.
The Economic Case for Fracking
The economic argument is substantial and helps explain why fracking remains politically durable despite the controversies. The shale boom transformed the U.S. energy landscape in under a decade. Shale gas now accounts for about 40% of all U.S. natural gas production, and tight oil from fracking makes up roughly 30% of domestic liquid fuel production. The Congressional Budget Office estimated that shale development would raise real GDP by about two-thirds of a percent by 2020 and a full 1% by 2040.
The price effects are even more striking. CBO projected that without shale gas, natural gas prices would be about 70% higher than current projections by 2040. Cheap natural gas has lowered electricity costs, benefited manufacturing, and reduced U.S. dependence on imported energy. Domestic reserves of shale gas alone could satisfy current consumption rates for roughly 25 years. These numbers make fracking politically difficult to oppose in regions where it supports jobs and tax revenue, even as the environmental and health costs mount.
Where Fracking Has Been Banned
Several governments have concluded that the risks outweigh the benefits. France banned fracking in 2011 after public pressure, and Germany followed with its own ban in 2016. Bulgaria, Ireland, and Tunisia have also prohibited the practice. In the United Kingdom, Scotland, Wales, Northern Ireland, and England all have moratoria or formal bans in place, though some of these could theoretically be reversed by future governments.
In the United States, Vermont became the first state to outlaw fracking in 2012, followed by New York in 2014, Maryland in 2017, and Washington in 2019. These bans tend to happen in states where the economic incentive is smaller or where public opposition reached critical mass. In states like Texas, Pennsylvania, and North Dakota, where fracking drives a significant share of the economy, outright bans remain politically unlikely. The result is a fractured regulatory landscape where the same activity can be completely prohibited in one state and lightly regulated just across the border.