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January 27, 2023

LA’s long, troubled history with urban oil drilling is nearing an end after years of health concerns

The Los Angeles area has over 20,000 active, idle or abandoned oil wells. The city and county have voted to ban new ones after studies showed health problems in residents living nearby.

Los Angeles had oil wells pumping in its neighbourhoods when Hollywood was in its infancy, and thousands of active wells still dot the city.

LA oil
Active oil wells can often be found next door to homes, office buildings and even schools. (Photo by Dogora Sun/Ssutterstock)

These wells can emit toxic chemicals such as benzene and other irritants into the air, often just feet from homes, schools and parks. But now, after nearly a decade of community organising and studies demonstrating the adverse health impacts on people living nearby, Los Angeles’ long history with urban drilling is nearing an end.

In a unanimous vote on 24 January 2023, the Los Angeles County Board of Supervisors voted to ban new oil and gas extraction and phase out existing operations. It followed a similar vote by the Los Angeles City Council a month earlier. The city set a 20-year phase-out period, while the county has yet to set a timetable.

As environmental health researchers, we study the impacts of oil drilling on surrounding communities. Our research shows that people living near these urban oil operations suffer higher rates of asthma than average, as well as wheezing, eye irritation and sore throats. In some cases, the impact on residents’ lungs is worse than living beside a highway or being exposed to secondhand smoke every day.

Los Angeles was once an oil town with forests of derricks

Over a century ago, the first industry to boom in Los Angeles was oil.

Oil was abundant and flowed close to the surface. In early 20th-century California, sparse laws governed mineral extraction, and rights to oil accrued to those who could pull it out of the ground first. This ushered in a period of rampant drilling, with wells and associated machinery crisscrossing the landscape. By the mid-1920s, Los Angeles was one of the largest oil-exporting regions in the world.

Oil rigs were so pervasive across the region that the Los Angeles Times described them in 1930 as “trees in a forest.” Working-class communities were initially supportive of the industry because it promised jobs but later pushed back as their neighbourhoods witnessed explosions and oil spills, along with longer-term damage to land, water and human health.

Tensions over land use, extraction rights and subsequent drops in oil prices due to overproduction eventually resulted in curbs on drilling and a long-standing practice of oil companies’ voluntary “self-regulation,” such as noise-reduction technologies. The industry began touting these voluntary approaches to deflect governmental regulation.

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Increasingly, oil companies disguised their activities with approaches such as operating inside buildings, building tall walls and designing islands off Long Beach and other sites to blend in with the landscape. Oil drilling was hidden in plain sight.

Today there are over 20,000 active, idle or abandoned wells spread across a county of ten million people. About one-third of residents live less than a mile from an active well site, some right next door.

Since the 2000s, the advance of extractive technologies to access harder-to-reach deposits has led to a resurgence of oil extraction activities. As extraction in some neighbourhoods has ramped up, people living in South Los Angeles and other neighbourhoods in oil fields have noticed frequent odours, nosebleeds and headaches.

Closer to urban oil drilling, poorer lung function

The city of Los Angeles has no buffers or setbacks between oil extraction and homes, and approximately 75% of active oil or gas wells are located within 500m (1,640ft) of “sensitive land uses”, such as homes, schools, child care facilities, parks or senior residential facilities.

Despite over a century of oil drilling in Los Angeles, until recently there was limited research into the health impacts. Working with community health workers and community-based organisations helped us gauge the impact oil wells are having on residents, particularly in its historically black and Hispanic neighbourhoods.


Oil drilling in Los Angeles.

The first step was a door-to-door survey of 813 neighbours from 203 households near wells in Las Cienegas oil field, just south and west of downtown. We found that asthma was significantly more common among people living near South Los Angeles oil wells than among residents of Los Angeles County as a whole. Nearly half the people we spoke with, 45%, didn’t know oil wells were operating nearby, and 63% didn’t know how to contact local regulatory authorities to report odours or environmental hazards.

Next, we measured the lung function of 747 long-term residents, ages 10 to 85, living near two drilling sites. Poor lung capacity, measured as the amount of air a person can exhale after taking a deep breath, and lung strength, how strongly the person can exhale, are both predictors of health problems including respiratory disease, death from cardiovascular problems and early death in general.

We found that the closer someone lived to an active or recently idle well site, the poorer that person’s lung function, even after adjusting for such other risk factors as smoking, asthma and living near a freeway. This research demonstrates a significant relationship between living near oil wells and worsened lung health.

People living up to 1,000m (0.6 miles) downwind of a well site showed lower lung function on average than those living farther away and upwind. The effect on their lungs’ capacity and strength was similar to the impacts of living near a freeway or, for women, being exposed to secondhand smoke.

We found evidence that oil-related contaminants, including toxic metals such as nickel and manganese, are getting into the bodies of the neighbours. This indicates contamination may be getting into the community.

Using a community monitoring network in South Los Angeles, we were able to distinguish oil-related pollution in neighbourhoods near wells. We found short-term spikes of air pollutants and methane, a potent greenhouse gas, at monitors less than 500m, about one-third of a mile, from oil sites.

When oil production at a site stopped, we observed significant reductions in such toxins as benzene, toluene and n-hexane in the air in adjacent neighbourhoods. These chemicals are known irritants, carcinogens and reproductive toxins. They are also associated with dizziness, headaches, fatigue, tremors and respiratory system irritation, including difficulty breathing and, at higher levels, impaired lung function.

Vulnerable communities at risk

Many of the dozens of active oil wells in South Los Angeles are in historically black and Hispanic communities that have been marginalized for decades. These neighbourhoods are already considered among the most highly polluted, with the most vulnerable residents in the state. Residents contend with multiple environmental and social stressors.

The city’s timeline for phasing out existing wells is set for 20 years, leaving concerns about continuing health effects during this period. We believe these neighbourhoods need sustained attention to reduce the existing health effects, and the city needs a plan for a just transition and clean-up of the oil fields as the areas transition to new uses.

This article by Jill Johnston, associate professor of population and public health sciences, University of Southern California, and Bhavna Shamasunder, associate professor of urban and environmental policy, Occidental College, is republished from The Conversation.

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