2026-04-09

Below Grade

Your basement air has a body count. We map the risk, price the fix, and kill the shrug.

Consumer-facing residential radon intelligence — an automated, opinionated site that turns EPA radon zones, geology, housing-age data, smoking prevalence, and mitigation economics into county scorecards, buyer guides, negotiation playbooks, and brutally useful explainers about the invisible gas sitting under millions of homes.

Niche Explored

Residential radon intelligence — county and ZIP-level radon-risk publishing that combines EPA radon zones, geology, housing stock, smoking prevalence, mitigation economics, and plain-English health guidance for homebuyers and homeowners.

Existing Competition

EPA Radon pages + Map of Radon Zones — authoritative, but static, county-level, and deliberately conservative. Helpful reference; not an editorial product, not consumer-personalized, not visual-first, not frequently synthesized into stories.
State radon program pages — fragmented, inconsistent, often ugly PDF-first experiences with weak SEO and almost no cross-state comparison.
Radon Insight / radonmap.com — map utility and vendor-adjacent product, but not a recurring content channel with journalism, scorecards, or affordability framing.
Airthings / home-monitor vendors — useful educational marketing pages, but optimized to sell monitors rather than explain risk like a public-interest intelligence site.
Real-estate blogs / home-inspector blogs — keyword-stuffed pages like “What is radon?” and “Do I need mitigation?” Usually thin, local, and not data-rich.

Gap: Nobody is building a beautiful, opinionated, automated radon newsroom that says: which counties are risky, which housing types are most exposed, where smokers face stacked risk, what mitigation likely costs, and whether a buyer should panic, negotiate, test, or fix.

Data Sources Found

EPA Map of Radon Zones — county-level radon potential classification (Zones 1–3) with downloadable spreadsheet/PDF. Updated resource page includes 2025 spreadsheet. URL: https://www.epa.gov/radon/epa-map-radon-zones
EPA Radon overview — current federal guidance, links to National Radon Action Plan and test-kit / mitigation resources. URL: https://www.epa.gov/radon
EPA Health Risk of Radon — core health-risk tables and action thresholds. Key figures: radon is the #1 cause of lung cancer among never-smokers; about 21,000 deaths/year per EPA estimate. URL: https://www.epa.gov/radon/health-risk-radon
National Cancer Institute Radon Fact Sheet — states radon is the second leading cause of lung cancer in the U.S.; estimates 15,000 to 22,000 U.S. lung-cancer deaths annually related to radon. URL: https://www.cancer.gov/about-cancer/causes-prevention/risk/substances/radon/radon-fact-sheet
CDC Radon hub — testing, prevention, communications, and community-risk framing. URL: https://www.cdc.gov/radon/index.html
CDC PLACES — county, tract, place, and ZCTA health indicators including adult smoking prevalence; useful because smoking materially multiplies radon risk. URL: https://www.cdc.gov/places/index.html
U.S. Census ACS 5-Year API — housing age, structure type, occupancy, renter/owner split, income, and mobility indicators. Useful for older-basement housing exposure and mitigation affordability analysis. URL: https://www.census.gov/data/developers/data-sets/acs-5year.html
USGS State Geologic Map Compilation (SGMC) — geology layer for uranium/radium-bearing formations and rock/soil context. URL: https://mrdata.usgs.gov/geology/state/
EPA state radon contacts / SIRG program resources — for state-specific program pages, grants, and mitigation/testing resources. Root URL: https://www.epa.gov/radon

SEO Analysis

High-intent, evergreen keywords with clear commercial and informational value:

“radon map”
“radon test”
“radon near me”
“radon mitigation cost”
“is radon dangerous”
“radon in basement”
“[state] radon map”
“[county] radon levels”
“should I buy a house with radon”
“radon level 4 pCi/L”

SEO gap: Most existing pages are either federal explainers, local contractor landing pages, or weak real-estate blog posts. There is major room for programmatic SEO around county and metro report cards with genuinely useful data layers.

Communities

Homeowners and homebuyers
First-time homebuyer communities
Home inspection and real-estate professionals
Public-health departments
Indoor air quality / healthy homes communities
Parents of young children living in basement-heavy, older housing stock
Smoking-cessation / lung health advocates (stacked-risk angle)

Likely online communities:

Reddit: r/homeowners, r/HomeImprovement, r/FirstTimeHomeBuyer, r/RealEstate
Home inspection forums and Facebook groups
State radon awareness campaigns during Radon Action Month / Week

Business / Monetization Signals

Strong purchase intent: Users searching radon terms often need to buy a test kit, a monitor, or a mitigation system quickly.
Lead-gen potential: Local mitigation contractors, certified measurement pros, and home inspectors all buy qualified leads.
Affiliate potential: Test kits, continuous radon monitors, indoor air-quality devices, dehumidifiers, sump-seal products.
Newsletter premium angle: Hyperlocal monthly “healthy home risk brief” that also covers mold, CO, wildfire smoke, humidity, and ventilation later.
B2B sponsorship: Home inspection software, real-estate brokerages, mitigation firms, IAQ brands.

Image/Graphic Feasibility

Very strong.

County choropleths for EPA zones
Layered geology + housing-age + smoking-risk maps
“Buy / Test / Negotiate / Fix” decision cards
Radon risk ladders using EPA pCi/L thresholds
County scorecards and metro comparisons
Basement cutaway illustrations explaining entry pathways
ROI cards: mitigation cost vs. avoided risk vs. resale friction

Why This Niche Works

Radon hits a rare sweet spot:

Genuinely useful — affects real home-buying and health decisions.
Under-served — existing content is stale, fragmented, and ugly.
Automatable — most core datasets are structured and slowly changing.
Monetizable — the reader is often one click away from spending money.
SEO-friendly — thousands of localized pages can be generated without becoming spam if the pages are actually data-rich.