Disclaimer: This blog is provided for informational and educational purposes only. Radon statistics referenced include data from the U.S. Environmental Protection Agency (EPA), the Centers for Disease Control and Prevention (CDC), the National Cancer Institute (NCI), the American Lung Association, the University of Nevada, Reno Extension Nevada Radon Education Program (NREP), and the Nevada Cancer Coalition. Northern Nevada testing data reflects results compiled through the NREP. Radon levels vary significantly by property, season, soil conditions, and building construction. Nothing in this blog constitutes professional environmental, health, or legal advice. Homeowners, buyers, and sellers should consult certified radon testing and mitigation professionals for property-specific guidance. The Kinney & Renwick Team can facilitate introductions to certified local professionals as part of our advisory process.

Key Takeaways

• Radon is the second leading cause of lung cancer in the United States and the number one cause among non-smokers, responsible for approximately 21,000 deaths per year according to the EPA and CDC.
• Northern Nevada's geological profile — granite-rich soils, basin-and-range terrain, and fractured bedrock — creates elevated radon risk. The Nevada Radon Education Program has found that 26% of Nevada homes tested show levels at or above the EPA action level; during real estate transactions in Northern Nevada specifically, that rate has been documented even higher.
• Parts of Washoe County, including Spanish Springs, have recorded radon readings far above the EPA's action threshold — some homes testing in the 150s pCi/L, or more than 37 times the level at which the EPA recommends immediate action.
• Mitigation is highly effective regardless of foundation type. Cost varies significantly based on foundation type, home size, soil conditions, and system complexity — always obtain written estimates from multiple certified contractors, as a professional assessment of your specific property is the only reliable number.
• Sellers who test proactively before listing eliminate one of the most common last-minute transaction complications — what we call The Invisible Contingency — and protect themselves legally under Nevada's mandatory disclosure laws.

There's something uniquely unsettling about a threat that registers on no human sense. No odor. No color. No taste. No sound. You can live in the same home for eleven years, sleep in it every night, raise a family in it, and share it with a silent, radioactive gas that has no observable presence whatsoever — and have no way to know unless you specifically test for it.

That's radon. And once you understand the science of how it forms, how it moves, how Northern Nevada's specific geology concentrates the risk, and what some of the actual test results in Washoe County have shown, it's hard to think about a home purchase or sale quite the same way again. This guide covers all of it — the chemistry, the geology, the testing protocols, the mitigation options by foundation type, and what the practical and legal implications are for buyers and sellers in Reno-Sparks today.

The Second-Leading Cause of Lung Cancer — and Most People Can't Name It

Lung cancer is the leading cause of cancer death in the United States. Most people know that smoking drives the majority of cases. Fewer people know what drives the second-largest share: radon gas, found in the soil beneath virtually every home in America.

According to the EPA and CDC, radon is responsible for approximately 21,000 lung cancer deaths in the United States every year. It is the second leading cause of lung cancer after cigarette smoking — and the single leading cause among people who have never smoked. Of those 21,000 annual deaths, roughly 2,900 occur in people with no history of smoking. They weren't exposed to secondhand smoke. They weren't miners working underground. They lived in homes — often for decades — in areas where radon accumulated without ever being measured.

The synergistic effect for smokers who are also exposed to elevated radon is severe. At the EPA's action level of 4 picocuries per liter of air (pCi/L), a non-smoker faces a lifetime lung cancer death risk of approximately 7 per 1,000 people. For a smoker exposed to the same level, that risk rises to approximately 62 per 1,000 — roughly nine times higher — because radon and tobacco act on lung tissue through related mechanisms that compound each other's damage.

The U.S. Surgeon General has issued a formal national health advisory on radon. The EPA, CDC, National Cancer Institute, and American Lung Association all treat radon as a significant, preventable public health risk — not a minor concern for specialists. And in Northern Nevada, the geology makes this national concern a specifically local one.

How Radon Forms: The Chemistry Beneath Your Foundation

To understand radon, you need to understand radioactive decay — specifically, what happens over geological timescales as uranium transforms into a sequence of other elements.

Uranium is not rare. It is present in varying concentrations in virtually all soils and rocks on Earth, with particularly high concentrations in granite, phosphate rock, and certain sedimentary formations. As uranium-238 decays, it moves through a long chain of radioactive intermediate products — thorium, protactinium, radium, and eventually radon-222. Radon is a noble gas, which means it doesn't bond with other elements. Once it forms from the decay of radium in soil and rock, it migrates. It moves through the pore spaces between soil particles, through cracks in bedrock, through the microscopic pathways opened by shifting ground, frost-thaw cycles, seasonal moisture changes, and pressure differentials. Outdoors, it disperses harmlessly into the open atmosphere — outdoor radon concentration averages just 0.4 pCi/L. The danger begins when it reaches a confined space.

When radon moves upward into the lowest level of a home, it no longer has the atmosphere to dilute it. It accumulates. The average radon level in U.S. homes is approximately 1.3 pCi/L — already above outdoor background. In higher-risk geological areas, or in homes where specific foundation characteristics create strong pressure differentials, levels can reach the double and triple digits.

Here's where the decay chain becomes personally relevant. Radon-222 has a half-life of approximately 3.8 days, during which it decays into a series of radioactive "daughter" products — most critically polonium-218 and polonium-214. Unlike radon gas, these polonium isotopes are solid particles. When inhaled, they can lodge in the cells lining the airways and lungs, where they continue to emit alpha radiation directly against the tissue. This is the mechanism behind radon-caused lung cancer: not the gas itself, but the high-energy radioactive particles its decay generates inside the body. It may take years or decades before damage accumulates to the level of detectable malignancy — which is precisely why long-term residential exposure, rather than a single acute event, drives the risk.

One aspect of radon that surprises many homeowners: the gas isn't a static feature of a property. As the ground beneath a home shifts — through thermal expansion and contraction, seismic movement, changes in soil moisture, or even nearby construction and landscaping activity — new pathways open and old ones close. A home that measured at a lower level several years ago may measure differently today. This isn't reason for alarm, but it is reason to test periodically rather than once and never again.

Why Northern Nevada Carries Above-Average Risk

Not all regions carry the same radon profile, and Northern Nevada is not a low-risk environment.

Reno-Sparks sits within the Basin and Range Province — a tectonically active geological region defined by fault-bounded mountain ranges alternating with broad alluvial valleys. The Sierra Nevada range to the west contributes significantly to the regional soil profile through granite-rich parent material. Granite is among the rock types with the highest natural uranium concentrations, and as that uranium slowly decays, it produces the radium that produces radon. Northern Nevada's landscape also carries the legacy of significant historical mining activity in some areas, which can disturb subsurface geology and create additional migration pathways for soil gas. The basin-and-range tectonic structure means fractured bedrock is common throughout the region — another geological feature associated with elevated radon mobility.

Reno-Sparks's climate compounds the physical risk. The region's cold winters, with extended periods of sealed homes and low outdoor air infiltration, create the exact conditions under which radon accumulates to its highest indoor concentrations. When a home is sealed against the cold and the furnace draws air from the lowest levels of the structure, the pressure dynamics that pull soil gas into the building are at their most active. The UNR Extension Nevada Radon Education Program notes that testing during colder months — when homes are sealed and ventilation is reduced — often reveals the highest radon levels in mountain and high-desert climates. Reno-Sparks is both.

The University of Nevada, Reno Extension Nevada Radon Education Program has published a Washoe County Radon Potential Map based on nearly three decades of testing data, showing radon potential by zip code across the Reno-Sparks metro area. What that map reveals — and what professionals in the NREP program consistently emphasize — is that radon potential varies at a very local level. The geological conditions beneath one property can differ meaningfully from those beneath a neighboring home. Two houses on the same block can test very differently.

The statewide figures are informative context. The Nevada Radon Education Program has documented that 26% of Nevada homes tested show radon levels at or above the EPA action level of 4 pCi/L. Nationally, the comparable figure is approximately 1 in 15 homes, or about 6.7%. Nevada is measurably above the national baseline. During real estate transactions specifically in Northern Nevada, the Nevada Cancer Coalition, citing NREP data, has reported that 40% of homes tested show elevated levels. This higher rate reflects both the geological reality and the fact that real estate testing often occurs in older homes where questions have already been raised — but the number is significant regardless.

Some of the local test results that have come in recently are genuinely alarming. Chris Kelly, program manager for the Nevada Radon Education Program, has publicly cited test results showing numerous homes in Spanish Springs with readings in the 150s pCi/L — more than 37 times the EPA's action threshold of 4 pCi/L. Multiple other Northern Nevada homes have recently returned results in the range of 20 to 30 pCi/L. These aren't statistical outliers confined to a single unusual property — they are part of a documented pattern that the NREP has tracked for years across Washoe County.

A point the UNR Extension program makes emphatically: even areas with moderate average potential can have individual homes with elevated readings, and the Reno-Sparks neighborhoods with the broadest range of home ages, foundation types, and proximity to mountain geology show the most pronounced variability between adjacent properties. Northwest Reno and Old Southwest Reno — where older homes with varied foundation profiles sit on terrain shaped by the Sierra foothills — often show significant variability from one lot to the next. Newer slab-on-grade developments in South Meadows, Double Diamond, and Damonte Ranch have a different exposure profile than older construction in Somersett or the areas of Spanish Springs where recent readings have drawn attention. Wingfield Springs and Caughlin Ranch, both communities with varied home vintages and foundation types, represent exactly the kind of mixed profile where testing is most informative.

This is precisely why the EPA's guidance is unconditional: all homes should be tested, regardless of zone designation, neighborhood age, year of construction, or what a neighbor's result showed.

How Radon Enters Your Home

Understanding the entry routes clarifies why mitigation works — and why surface-level solutions rarely do.

Radon enters homes through any point where the structure contacts the ground. The most common entry routes are cracks in concrete slab floors and basement floors, construction joints where different foundation elements connect, gaps around service pipes and utility penetrations through the foundation, porous concrete blocks in basement or stem walls, and the exposed soil or bare earth of a crawl space. Even carefully constructed, well-maintained homes have some pathway through which soil gas can migrate — construction tolerances, normal settling over time, and the inherent porosity of concrete create continuity between the air inside the home and the soil beneath it.

The physics driving radon entry is a pressure differential. A heated home in winter is typically at slightly lower air pressure than the soil beneath it, and that differential acts as a persistent, low-level pump drawing soil gas upward into the living space. Every furnace cycle, every door opening, every wind gust across the exterior shifts the pressure relationship between the interior and the ground. Radon follows the path of least resistance — and in a tightly sealed, energy-efficient home, there may be very little natural air exchange to dilute what accumulates.

This pressure dynamic explains seasonal variation. In Reno-Sparks, homes tend to show higher radon readings in colder months, when windows and doors are shut and heating systems are cycling actively. It's also why the standard protocol for real estate transaction testing requires closed-house conditions during the test period — open windows would artificially suppress readings and give a misleading result. The test is designed to reflect what a resident actually breathes during normal living conditions, not what the air looks like when the home is cross-ventilated on a mild afternoon.

Understanding Radon Levels: The Numbers That Matter

Radon is measured in picocuries per liter of air, abbreviated pCi/L. A picocurie is a unit of radioactivity — one trillionth of a curie, the standard measure of a radioactive decay rate. Here are the reference points that frame any individual result.

Outdoor air averages approximately 0.4 pCi/L. The average indoor radon level in U.S. homes is approximately 1.3 pCi/L. The EPA's action level — the concentration at which the agency recommends mitigation — is 4.0 pCi/L. The EPA also recommends strongly considering action for levels between 2 and 4 pCi/L, acknowledging that there is no established safe threshold for radon exposure, only levels at which the risk is more or less elevated.

The World Health Organization takes a more conservative position, recommending action at levels above 2.7 pCi/L. Both organizations are clear that at 4 pCi/L and above, action is not optional for anyone with a serious interest in the health of the people living in the home.

At the 4 pCi/L action threshold, a non-smoker faces a lifetime lung cancer death risk of approximately 7 per 1,000, according to the EPA's risk model. At 10 pCi/L, that rises to approximately 18 per 1,000. For the Spanish Springs homes that have measured in the 150s, the risk calculation enters a different register entirely.

Mitigation cannot reduce levels to zero, but properly designed and installed systems can achieve substantial reductions — often bringing levels well below the EPA action threshold. Post-mitigation results vary by home, soil conditions, and system design. A certified contractor can discuss realistic expectations for your specific property.

One final point on numbers: proximity to the action level matters even before you cross it. The EPA's recommendation to consider action in the 2 to 4 pCi/L range is meaningful — a result of 3.6 pCi/L is not a clean bill of health. It's a result that warrants a serious conversation with a certified mitigation professional about the options for bringing the home to a more conservative level.

Testing Your Home: Short-Term, Long-Term, and Real Estate Protocols

Testing is the only way to know your home's radon level. No map, no geological zone designation, no neighbor's result, and no age or construction type of your home can substitute for a direct measurement of the air inside your specific property.

There are two primary testing approaches. Short-term tests run from 48 hours to seven days. For real estate transactions, the standard is a 48-to-96-hour test conducted under closed-house conditions — meaning windows and doors remain shut except for normal entry and exit, and any HVAC systems that bring outdoor air in directly are not operated during the test period. A certified tester places a continuous electronic monitor or a charcoal-based passive device at the lowest regularly usable level of the home, retrieves it at the end of the test period, and either provides immediate results (electronic) or sends the device to a laboratory.

Long-term tests run for 91 days or more, and they capture seasonal variation rather than a snapshot. For homeowners not in a time-constrained transaction, long-term tests provide a more accurate picture of average annual exposure — particularly important in a climate like Reno-Sparks where the difference between winter and summer radon accumulation can be substantial. The American Lung Association recommends retesting every two years under normal circumstances, and always when buying or selling a home, completing major renovations, or making changes to the foundation.

For real estate transactions, the University of Nevada, Reno Extension strongly recommends using a certified radon measurement professional rather than a DIY kit. The distinction matters because transaction test results inform negotiations with financial stakes attached, and because certification programs — specifically the American Association of Radon Scientists and Technologists National Radon Proficiency Program (AARST-NRPP) and the National Radon Safety Board (NRSB) — require that testers follow EPA protocols and use tamper-resistant devices. An uncertified DIY test is informative for a homeowner's personal awareness; it's a weaker document when a buyer or seller is relying on it in a negotiation.

Mitigation by Foundation Type: Slab, Crawl Space, Basement, and Mixed

When a test returns a result at or above the EPA action level, mitigation is the next conversation — not alarm. Radon mitigation is a mature technology with well-established methods, strong success rates, and a system design that is specific to your home's foundation type and soil conditions. A certified contractor determines the right approach through a visual inspection and, if needed, diagnostic testing to assess airflow beneath the structure. Cost varies based on what that inspection reveals — obtain written estimates from multiple certified contractors before committing to any scope of work.

Slab-on-Grade Homes

Sub-slab depressurization (SSD) is the standard approach for homes with a concrete slab foundation — by far the most common type in newer Reno-Sparks construction, including communities throughout South Meadows, Double Diamond, and large parts of Southwest Reno. The system works by drilling one or more small holes through the concrete slab, excavating a suction pit beneath the concrete, and connecting a PVC pipe network to a continuously running exhaust fan. The fan creates a zone of negative pressure beneath the slab, drawing radon-laden soil gas out before it can migrate into the living space and exhausting it safely outdoors — at a point well away from windows, doors, and any reentry point.

Sub-slab depressurization typically reduces radon levels by 50 to 99 percent according to the EPA's Consumer's Guide to Radon Reduction. In favorable soil conditions, a single suction point is often sufficient. Denser clay soils may require additional suction points to achieve sufficient pressure distribution across the footprint.

Installation cost varies based on home size, soil conditions, the number of suction points required, and pipe routing complexity. Simple single-point systems on smaller homes with favorable soil conditions will cost less; larger homes, dense soil requiring multiple suction points, or complex pipe routing can push costs significantly higher — in some cases approaching or exceeding $10,000. Obtain written estimates from multiple certified contractors before committing to any system.

The fan runs continuously but consumes roughly the electricity of a low-wattage light bulb. Operating costs are modest, though the exact amount depends on your system's fan model and local utility rates — your contractor can provide a realistic estimate.

Crawl Space Homes

Homes with crawl spaces — more common in Northwest Reno, Old Southwest Reno, and some older Sparks neighborhoods — use sub-membrane depressurization (SMD). A heavy-duty polyethylene membrane — typically at least 6 mil in thickness — is laid over the entire crawl space floor and sealed at the walls, foundation piers, and any penetrations of the membrane. A vent pipe attached beneath the membrane, connected to an exhaust fan, draws soil gas out from under the membrane and expels it outdoors.

SMD is also in the 50 to 99 percent reduction range when properly installed, according to the EPA. It carries a secondary benefit worth noting: the sealed membrane dramatically reduces moisture infiltration into the crawl space, which can improve overall indoor air quality and protect wood framing from the humidity-related damage common in Northern Nevada's seasonal climate swings.

Because of the additional materials and labor involved, crawl space mitigation costs more than slab systems. Crawl space size, accessibility, soil conditions, and membrane complexity all affect the final number — and costs for more involved installations can run considerably higher. Get written estimates from certified contractors who have physically assessed the crawl space before committing to a scope of work.

An alternative approach for some crawl space homes — active crawl space ventilation using fans to dilute radon before it rises into the living area — is generally less effective than SMD and can increase energy costs due to conditioned air loss. Most certified contractors recommend SMD as the primary approach when it is structurally feasible.

Basement Homes

Homes with basements — less common in Reno-Sparks but present in parts of Northwest Reno, Caughlin Ranch, and some older construction — have the most options. Sub-slab depressurization through the basement floor is the standard approach, installed and operated the same way as in a slab-on-grade home. In homes with existing drain tile or French drain perimeter systems, drain tile suction connects the mitigation system to that existing infrastructure, often with excellent effectiveness because the drain loop provides a built-in pathway for soil gas collection. In homes with sump pumps, sump-hole suction uses a capped sump pit as the primary collection point for the mitigation system.

Homes with hollow concrete block foundation walls may require block wall suction, which draws negative pressure through the hollow cores of the blocks to prevent radon from migrating through mortar joints into the living space. This method is typically used in combination with sub-slab suction when block walls represent a significant entry pathway.

Mixed Foundation Homes

It's common — especially in older or custom-built properties — to have a combination of foundation types: a slab beneath the main living area with a crawl space under a later addition, or a partial basement under one wing with slab elsewhere. These homes require a combination approach, with each section of the foundation addressed appropriately. A certified contractor will inspect the full footprint and design a multi-point system. Obtain estimates from contractors who have walked the entire home, not just assessed one section of it.

A Note on Sealing

One approach worth addressing specifically: sealing cracks and penetrations in the foundation is a component of good practice and is done as part of most mitigation installations, but the EPA does not recommend sealing alone as a radon reduction strategy. Sealing without active depressurization has not been shown to produce reliable, sustained reductions — because new pathways open as homes settle and soil conditions change. Sealing improves the efficiency of active systems; it does not replace them.

What Buyers Need to Know

For buyers considering a home in Reno-Sparks — and particularly for those relocating from California, Oregon, or Washington, where radon awareness and testing norms vary considerably by region — a few practical points deserve direct emphasis.

Request testing as part of the inspection process, not as a secondary item. A certified radon test adds modest cost to a home inspection package and delivers specific, property-level information that no map or general statistic can provide. Given that 26% of Nevada homes tested exceed the EPA action level, and that real estate transaction testing in Northern Nevada has documented elevated rates well above the national baseline, this is a measurement that belongs in the information file on any Reno-Sparks property alongside the roof report, the HVAC age, and the title history.

For out-of-state buyers moving to communities like Somersett, ArrowCreek, Wingfield Springs, or the broader Reno metro — a group that represents a meaningful share of active buyers in this market, many of whom are doing due diligence remotely or under compressed timelines — understanding the local radon profile is part of responsible preparation that a knowledgeable local advisor should walk through before any offer is finalized. If you're a California buyer working through the equity and purchasing power math of a Reno-Sparks move, our breakdown of who's buying in the market and why is worth reading alongside this one.

A home with an existing, properly functioning mitigation system is not a reason for concern — it is documentation. The previous owner acknowledged a risk, engaged a certified professional, and created a system that can be tested and verified. Ask for the installation records, the most recent post-system test result, and confirmation that the fan is operational. A home with a verified, functioning mitigation system is a better-documented property than one with no radon history at all.

If a test does come back elevated, a clear pathway exists. Sellers can agree to install mitigation before closing, or funds can be escrowed for post-closing remediation. An elevated result is not a reason to abandon a transaction; it's information that gets factored in and addressed.

The Invisible Contingency: What Sellers Need to Know

Most sellers who prepare thoughtfully for a transaction think through the obvious inspection issues: the HVAC age, the roof condition, the water heater, the plumbing under the sinks. These are visible, knowable things that pre-listing attention can address before a buyer ever walks through the door. Radon operates differently — and for sellers who haven't tested, it functions as what we call The Invisible Contingency.

Here's the pattern that plays out more often than sellers expect: a transaction reaches day 17 of a 21-day inspection window. The buyer's inspector has run a radon test as part of the inspection. The results come back elevated. The buyer's agent submits a repair request. Suddenly there's a new negotiation — who pays for mitigation, whether the price should adjust, whether there will be re-testing before close — landing at exactly the moment when both parties believed the hard part was behind them. In a tight market, this is disruptive. In a transaction with any pre-existing friction, it can be destabilizing. And it's entirely avoidable.

Sellers who test proactively before listing eliminate this scenario. If a test comes back below 4 pCi/L, document the result, make it available for buyer disclosure, and proceed with the knowledge that this item will not reappear during inspection. If a test comes back elevated, remediate — and then list the home with documentation showing a functioning system, a certified post-remediation test, and the current operating result. That documentation doesn't diminish the home's appeal. In many cases, it strengthens it. A buyer considering two comparable properties in Spanish Springs or Wingfield Springs, one with documented clean air quality management and one with no radon history, is being given meaningfully different information about the seller's approach to the transaction.

The math for proactive sellers is straightforward. Testing cost varies by provider and scope — contact certified local professionals for current Reno-Sparks pricing. Mitigation cost, if needed, varies considerably based on foundation type, home size, soil conditions, and system complexity and should be assessed by a certified contractor who has evaluated your specific property. Even so, the combined cost of testing and mitigation is measurably less than the cost of a last-minute negotiation under time pressure, where a buyer who has invested weeks in due diligence is asking for a price reduction or concession to cover a problem they've just discovered. It also communicates something about the character of the seller — the kind of transparency that makes transactions smooth rather than fraught.

This is an area where the Kinney & Renwick Team brings specific advisory value. As part of how we prepare clients for the listing process, we facilitate introductions to certified radon testing and mitigation professionals. We don't publicly endorse specific companies — that decision belongs to each homeowner — but we maintain relationships with qualified, certified local professionals who work within the real estate transaction timeline and understand the testing and documentation requirements that buyers and their agents expect. This kind of pre-listing coordination is part of what we cover when we talk about preparing a home to go to market the right way. That broader pre-listing framework is laid out in detail in our guide to what Reno-Sparks home sellers should do before they list.

Sellers who have owned their homes for a decade or more — particularly those in the life-transition stages that drive a large share of listing activity, including downsizing, estate transitions, and relocations — often have no radon history on file because testing wasn't part of the conversation when they originally purchased. That's understandable. Proactive testing before listing is how that history gets established — on your terms, with your timeline, rather than under a buyer's deadline.

What Nevada Law Requires Sellers to Know

There is an important legal distinction every Reno-Sparks seller needs to understand before deciding whether to test for radon.

Nevada does not require sellers to test for radon before listing a home. No law mandates that test. But Nevada's Seller's Real Property Disclosure form — required under NRS 113.130 for virtually all residential real estate transactions — explicitly asks whether the seller is aware of any environmental hazards on the property, and radon gas is named on that form by category.

What this means in plain terms: a seller who has no knowledge of radon has nothing to disclose on that line. But a seller who does have knowledge — from a test result, a previous inspector's report, a neighbor's disclosure, or any other source — is legally required to disclose it. Under NRS 113.130, all known defects that materially affect the value or use of a property must be disclosed before the sale closes. Elevated radon levels above the EPA action threshold qualify as a material defect. Failure to disclose a known defect carries significant legal exposure under NRS 113.150, including treble damages — three times the cost of repair or replacement — plus attorney fees and court costs. The Nevada Supreme Court has held that the bar for triggering this liability is low; even unintentional non-disclosure can be enough.

This is one of the most important reasons to test proactively before listing — and to do so with enough lead time to act on what you find. A seller who tests before going to market and gets a clean result has documentation confirming no elevated radon was present and nothing to disclose on that line of the SRPD. A seller who tests, finds elevated levels, and remediates before listing can disclose the full history accurately: elevated result found, certified mitigation installed, post-remediation test confirming current levels. Either outcome is a controlled one.

The scenario that creates the most legal and transactional risk is a seller who has any prior awareness of a potential radon issue — a mention in a past inspection report, a neighbor who tested high, a mitigation system installed by a previous owner whose documentation has been lost — and either doesn't test or doesn't disclose what they know. That is the situation where NRS 113.150 exposure becomes real.

Testing before listing is not just a strategic recommendation. For sellers who have any prior awareness of a potential radon issue, getting a certified test on record and addressing what it shows is how you protect yourself legally and approach the transaction with clean hands.

The above is provided as general information only and does not constitute legal advice. Sellers with specific questions about their disclosure obligations under Nevada law should consult a licensed Nevada real estate attorney.

Bringing It All Together

Radon is one of those topics that changes a person's perspective once they understand it fully. It's not an obscure environmental curiosity — it's the second-largest cause of lung cancer in a country where lung cancer kills more people annually than the next two cancers combined. It is present in essentially all soils, it is particularly well-documented in Northern Nevada's geological profile, and it has an effective, proven solution for every common foundation type. The only thing that stands between most homeowners and knowing their exposure level is a test they haven't taken yet.

If you're buying a home in Reno-Sparks, add radon testing to the due diligence checklist. It fits within the standard inspection window, and the information it produces belongs in the complete picture of any property you're considering.

If you're selling, consider testing now — not because you're required to test, and not because you expect to find a problem, but because sellers who control the information available about their home are sellers who control their transaction. The Invisible Contingency exists only when you haven't looked for it. When you have, and when the result is documented and resolved, it becomes an asset. And as Nevada law makes clear, once you do have knowledge of an issue, disclosure is not optional.

If you're a Reno-Sparks homeowner with no active transaction plans but a home that has never been tested — particularly in Spanish Springs, Northwest Reno, Old Southwest Reno, or any area where Northern Nevada's geology creates meaningful exposure potential — the test is worth having. It's the only measurement that tells you what's actually in the air your family breathes.

The Kinney & Renwick Team represents buyers and sellers across Reno-Sparks — from Damonte Ranch and South Meadows to Somersett, Caughlin Ranch, ArrowCreek, and the wider metro — and radon is part of the advisory conversation we have with every client we work with who hasn't addressed it yet. If you're considering a strategic sale or a well-prepared purchase and want to talk through how this fits your specific situation, we're happy to have a thoughtful conversation about your goals. Contact Kevin Kinney at 775-391-8402 or Robin Renwick at 775-813-1255.

FAQs

How common is elevated radon in Reno-Sparks homes? Northern Nevada's geological profile creates above-average radon risk relative to the national baseline. Nationally, approximately 1 in 15 homes — about 6.7% — tests at or above the EPA action level of 4 pCi/L. The Nevada Radon Education Program has documented that 26% of Nevada homes tested show elevated levels. During real estate transactions specifically in Northern Nevada, the Nevada Cancer Coalition, citing NREP data, has reported 40% of homes tested showing elevated results. Radon risk also varies considerably at the neighborhood and property level — adjacent homes can test very differently depending on the soil, bedrock, and construction details beneath each individual property.

Does a newer home have lower radon risk than an older one? Not necessarily — and this surprises many buyers. Radon risk is primarily determined by the geological conditions beneath a home and the construction details that govern how soil gas can enter, not by the age of the structure. In fact, newer homes built to current energy efficiency standards can sometimes accumulate radon more rapidly than older, less tightly sealed construction, because reduced air infiltration means less natural dilution. Newer developments in South Meadows, Double Diamond, and Damonte Ranch built on slab foundations should be tested with the same rigor as older properties in Northwest Reno or Spanish Springs.

How long does radon testing take during a real estate transaction? Short-term tests used for real estate transactions typically run 48 to 96 hours under closed-house conditions — windows and doors closed except for normal entry and exit, and no HVAC systems that bring outdoor air in during the test period. A certified tester places a measurement device at the lowest regularly usable level of the home at the start of the period and retrieves it at the end. Electronic continuous monitors provide results immediately; charcoal passive devices are sent to a laboratory. Either approach fits comfortably within a standard 10-to-21-day inspection window.

What happens if a test comes back at or above 4 pCi/L? Mitigation is recommended — not an end to the transaction. A certified mitigation contractor assesses the foundation and designs the appropriate system, typically providing a written estimate. In a real estate context, parties commonly negotiate who bears the cost: the seller may install the system before closing, or funds may be escrowed for post-closing installation. A post-installation test confirms the result. Mitigation cost varies based on foundation type, home size, and system complexity — obtain written estimates from multiple certified contractors to get an accurate figure for your specific property. The Kinney & Renwick Team can facilitate introductions to certified local professionals to move this process forward efficiently.

Does Nevada require radon testing when selling a home? Nevada does not require sellers to test for radon before listing. However, Nevada's Seller's Real Property Disclosure form — required under NRS 113.130 for virtually all residential transactions — explicitly asks about radon gas as an environmental hazard. Once a seller has knowledge of elevated radon levels, it becomes a material defect that must be disclosed. Failure to disclose a known defect can expose a seller to treble damages under NRS 113.150. Sellers with specific questions about their disclosure obligations should consult a licensed Nevada real estate attorney.

My neighbor's radon test came back low. Can I assume mine will too? No. The University of Nevada, Reno Extension emphasizes that adjacent homes can test very differently because radon depends on the specific geology, soil composition, bedrock structure, and construction details beneath and within each individual property — not on what's happening next door. Radon maps and zone designations indicate regional risk levels but cannot predict what a specific home will show. Only testing that home provides a reliable answer.

How much does radon mitigation typically cost? Mitigation cost varies significantly depending on foundation type, home size, soil conditions, the number of suction points required, pipe routing complexity, and whether the home has a mixed foundation. Simple installations under favorable conditions cost less; larger homes, difficult soil, or complex multi-point systems can run considerably higher — in some cases approaching or exceeding $10,000. Always obtain written estimates from multiple certified contractors who have physically assessed your specific property before budgeting for mitigation.

Is a home with an existing radon mitigation system a red flag for buyers? No — and this misperception is worth addressing directly. A home with an existing, properly functioning mitigation system is a home where a previous owner took responsible, proactive action. Rather than a red flag, it's documentation: the seller identified a risk, engaged a certified professional, and created a verifiable solution. When buying a home with an existing system, ask for the installation records, the most recent post-system test result, and confirmation that the fan is running. A functioning system that reduced an elevated result to a low level is a completed, tested solution — not a liability.