The source: uranium in the rock
Radon is a decay product of uranium. New Mexico has a long, well-documented history of uranium-bearing geology — the Grants Mineral Belt in the northwest was one of the largest uranium-producing districts in the United States. Uranium is also present at lower but meaningful concentrations across much of the state's volcanic rock, granites, and sedimentary formations, including the basin fill of the Rio Grande rift that Albuquerque sits in.
You do not need a mine underneath you. Ordinary background concentrations of uranium in soil generate radon continuously, everywhere.
The pathway: dry, permeable soil
Radon has a half-life of about 3.8 days. Whether it reaches your house depends on how quickly it can travel through soil before decaying. Wet, dense clay slows it. The dry, sandy, gravelly soils common across the Albuquerque metro and the Rio Grande valley do the opposite — they are highly permeable, and soil gas moves through them easily.
- Dry soil means open pore space and fast gas movement.
- Fractured bedrock and volcanic formations create direct channels.
- Backfill around a foundation is typically looser than surrounding soil, forming a preferential path straight to your slab.
The driver: your house is a chimney
Warm indoor air rises and escapes through the upper part of a building, which slightly depressurizes the lower part. That pressure difference — the stack effect — actively pulls soil gas through every crack and penetration in the foundation. New Mexico's large day-night temperature swings and cold winter nights make this effect strong. Running exhaust fans, a clothes dryer, or a fireplace increases it further.
Local building patterns that matter
| Feature | Effect on radon |
|---|---|
| Slab-on-grade construction | No buffer level; soil gas enters living space directly |
| Post-tension slabs | Cracking still occurs; changes where suction points can be cut |
| Caliche and compacted subgrade | Poor sub-slab communication; more suction points needed |
| Evaporative (swamp) coolers | Pressurize the home seasonally, masking real annual levels |
| Newer tight envelopes | Less natural dilution of whatever enters |
What this means for you
Radon varies house to house, so no county map or ZIP-level average tells you your number. It tells you the odds are worth taking seriously. In this region, the practical takeaway is simple: test the house, test it under closed-house conditions, and retest every couple of years.
EPA radon action levels
Scale shown in picocuries per liter (pCi/L).
Green is at or below the typical US indoor average. Amber is the range where the EPA suggests considering mitigation. Red is at or above the 4.0 pCi/L action level, where the EPA recommends fixing the home.
Related services
Keep learning
- EPA Radon Action Levels ExplainedTwo numbers drive nearly every radon decision: 4.0 pCi/L, where the EPA recommends action, and 2.0 pCi/L, where it suggests considering it. Here is what sits behind them.
- Radon Health Risks: What the Evidence ShowsRadon is the second leading cause of lung cancer in the United States. The mechanism is well understood, and the risk scales with concentration and time.
Service areas
- Radon Mitigation & Testing in Albuquerque, NMAlbuquerque homes are overwhelmingly slab-on-grade, sitting on Rio Grande rift basin fill. That combination shapes how radon enters and how a system has to be designed.
- Radon Mitigation & Testing in Rio Rancho, NMRio Rancho's newer, tighter homes on West Mesa terrain present a specific radon profile: less natural air exchange and variable sub-slab material.
- Radon Testing & Mitigation in New MexicoNew Mexico's uranium-bearing geology and dry, permeable soils make elevated indoor radon common statewide. This is the hub for our area coverage.