Invisible and Unequal: How America's Radon Crisis Falls Hardest on Renters Who Can Least Afford to Be Ignored

A Carcinogen No One Talks About in the Wrong Zip Codes

It has no smell. It produces no visible stain on a wall or ceiling. It triggers no alarm unless someone deliberately places a testing device in the right location. Radon—a naturally occurring radioactive gas that seeps upward through soil and accumulates inside buildings—is responsible for approximately 21,000 lung cancer deaths in the United States every year, according to the Environmental Protection Agency. Only cigarette smoking claims more lives from the same disease.

And yet, for millions of low-income renters living in aging apartment buildings, deteriorating row houses, and crowded basement units, radon remains almost entirely off the radar. Not because the science is uncertain. Not because the testing is technically difficult. But because the infrastructure of radon protection in this country was built with a specific kind of household in mind—one that owns its home, has disposable income, and possesses the legal authority to demand mitigation.

That household rarely lives in the neighborhoods bearing the greatest environmental health burdens.

Who Radon Awareness Actually Reaches

The EPA's radon outreach programs, state-level public health campaigns, and real estate disclosure requirements have, over decades, created a meaningful culture of radon testing among homeowners in higher-income brackets. When a family purchases a home, radon testing is frequently part of the standard inspection process. Sellers in many states are legally required to disclose known radon levels. Homeowners who discover elevated concentrations can install sub-slab depressurization systems—an effective mitigation approach—and in some states, tax credits or utility assistance programs help defray the cost.

This is a genuine public health achievement. But it is also a profoundly unequal one.

For renters—who make up more than a third of all U.S. households and represent a disproportionate share of lower-income Americans—almost none of these protections apply in any consistent, enforceable way. Federal law does not require landlords to test rental units for radon. Most state laws do not either. Radon is conspicuously absent from the habitability standards embedded in the majority of residential landlord-tenant statutes across the country. A landlord can legally rent a basement apartment with radon levels several times above the EPA's action threshold of 4 picocuries per liter and face no legal consequence whatsoever in most jurisdictions.

The Geography of Exposure

Radon risk is not uniformly distributed across the country. The EPA's zone mapping identifies large swaths of the Midwest, Appalachia, and the northern Plains as high-potential radon regions, where underlying geology produces elevated soil gas concentrations. These same regions contain significant concentrations of economically distressed communities—former industrial towns, rural counties with limited healthcare infrastructure, and urban neighborhoods that have experienced decades of disinvestment.

The compounding effect is significant. Residents in these areas are more likely to live in older housing stock with compromised foundation integrity, more likely to occupy ground-floor or below-grade units where radon accumulates most readily, and less likely to have ever had a conversation with a healthcare provider about radon as a lung cancer risk factor. Research published in public health journals has consistently found that radon testing rates correlate with income and homeownership status—meaning the people most geographically and structurally vulnerable to elevated exposure are also the least likely to know their risk.

For communities of color, this disparity carries additional weight. Environmental justice research has documented that Black, Latino, and Indigenous communities are more likely to reside in high-radon geological zones while simultaneously facing the steepest barriers to testing and remediation. The intersection of race, income, and housing tenure creates a layered disadvantage that conventional radon policy has done almost nothing to address.

What Renters Can Actually Do

Despite the structural gaps in radon policy, there are practical steps renters can take—and advocates can support—to reduce exposure risk.

Request a test in writing. While most states do not legally compel landlords to test for radon, a written request creates a paper trail. Tenants who document their concerns and a landlord's failure to respond may have stronger standing in habitability disputes, particularly in jurisdictions where courts have interpreted the implied warranty of habitability broadly.

Use a low-cost test kit. Short-term radon test kits are available at many hardware stores and online for under $20. The National Radon Program Services, operated through Kansas State University with EPA support, offers discounted kits and laboratory analysis. Testing a unit independently, while not a substitute for landlord accountability, gives tenants documented evidence of their living conditions.

Contact your state radon office. Every state has a radon program, and many offer free or subsidized testing kits to qualifying households. Some state programs specifically target rental housing or have outreach initiatives for low-income communities. The EPA maintains a directory of state radon contacts that can connect tenants with local resources.

Increase ventilation where possible. Opening windows and improving airflow can reduce radon concentrations as a temporary measure, though it is not a substitute for professional mitigation. Ground-floor and basement tenants should prioritize ventilation in rooms where family members spend extended time.

Connect with local housing advocates. Tenant organizations and legal aid clinics in many cities are increasingly incorporating environmental health concerns—including radon—into their advocacy platforms. Building a documented case alongside other tenants in the same building can create leverage for demanding testing and remediation.

The Policy Reforms That Would Change Everything

Individual action, however important, cannot substitute for systemic reform. The Healthy Homes Collaborative supports a set of policy interventions that would meaningfully extend radon protections to renters in underserved communities.

First, radon disclosure requirements should apply to rental housing, not merely home sales. Several states—including Maine, Montana, and Florida—have taken steps in this direction, and their frameworks offer replicable models for broader adoption. Federal minimum standards for rental housing habitability should explicitly include radon testing thresholds.

Second, public funding for radon mitigation must be directed toward rental housing in low-income communities. The Weatherization Assistance Program and HUD's Healthy Homes Production grant program both have the administrative infrastructure to incorporate radon mitigation as a covered intervention. Expanding their scope would reach tenants who currently have no pathway to remediation.

Third, community health worker programs—already operating in many underserved neighborhoods to address asthma, lead exposure, and other housing-related health hazards—should be equipped and trained to conduct radon screenings as part of their routine home visits. These trusted messengers can reach households that public health campaigns consistently miss.

A Crisis Hidden in Plain Sight

Radon does not discriminate by income. The gas rises through soil beneath public housing complexes and luxury condominiums alike. But the response to radon—the testing, the mitigation, the institutional attention—has been profoundly unequal. Low-income renters, particularly those in high-risk geological regions, have been left to absorb a preventable cancer risk that their more affluent counterparts have largely been shielded from.

That is not an accident of geology. It is a consequence of policy choices, regulatory gaps, and a public health infrastructure that has consistently oriented itself toward those with the most resources and the loudest voices. Correcting it requires the same commitment to housing justice that drives every dimension of the Healthy Homes Collaborative's mission: the recognition that a safe home is not a luxury, and that the air inside it—however invisible—is a matter of life and death.