Radon Mitigation in Murfreesboro, TN

When a Rutherford County test comes back at 4 pCi/L or higher, the next step is almost always a radon mitigation system. It's not a filter, a gadget, or an air purifier. It's a sealed vent pipe and a fan that pull soil gas from under the house before it gets inside and exhaust it above the roof. Here's how these systems work on the foundations you find around Murfreesboro, what affects the price, and how to pick an installer.

The basic principle

A house acts a bit like a chimney. Warm air rises and leaks out up high, and replacement air is pulled in down low, including from the soil through foundation cracks, gaps around pipes, and an open crawl space. A mitigation system turns that around. The fan makes the area under the house lower in pressure than the house itself, so soil gas flows into the pipe instead of into your rooms.

The EPA calls this active soil depressurization. It's the most common and generally the most effective radon fix for existing homes.

Matching the system to the foundation

Murfreesboro has a wide range of housing: older brick ranches and bungalows near downtown, decades of crawl space subdivisions, and a wave of newer construction from Blackman to Rockvale on slabs and crawl spaces. The system design follows the foundation:

• Crawl space: sub-membrane depressurization, a sealed plastic barrier over the soil with suction underneath. Details are on our crawl space page.
• Slab-on-grade: sub-slab depressurization, a suction point cored through the slab, often in the garage or a closet.
• Basement: sub-slab suction, sometimes using a sump pit or drain tile, plus sealing of the floor-wall joint.
• Combination: many homes have a crawl space under the main house and a slab under the garage or an addition. A single fan can often draw from both.

What gets installed

• Suction point(s) under the slab or membrane.
• Schedule 40 PVC pipe with sealed joints, sloped so condensation drains down.
• A radon fan outside the living space: attic, garage, or exterior wall.
• A discharge above the roof edge, away from windows, doors, and neighboring buildings.
• A manometer showing the system is pulling suction.
• Sealing of reachable cracks and openings.
• A system label with the installer's info and date.

Signs of a quality installation

Certified mitigators work to the ANSI/AARST soil gas mitigation standards. Expect:

1. A pre-installation look at the foundation and, for slabs, a suction or communication test.
2. A clear plan for where the pipe and fan will go, which matters for curb appeal.
3. Clean, sealed penetrations and neat pipe runs.
4. A manometer you can read, and an explanation of what it means.
5. A post-mitigation test at least 24 hours after start-up and within 30 days.
6. A written guarantee on the result, usually below 4 pCi/L, plus warranty terms on the fan.

Tennessee does not license radon mitigation contractors, so national certification is the way to judge training. Ask for NRPP or NRSB credentials.

Typical costs, national numbers

Angi's 2026 data, drawn from 1,184 projects, puts a typical active radon system at $805 to $1,326 nationally, averaging around $1,043. Crawl spaces needing large membranes, multiple suction points, long interior pipe runs, and added electrical work tend to raise the price. These are typical national ranges only. We don't set prices, and every professional quotes after seeing your home.

Things that move the price

• Crawl space size and condition. More square footage means more membrane and labor. Low clearance makes the work slower.
• What's under the slab. Gravel lets suction spread; Middle Tennessee clay can require extra suction points.
• Pipe route. Through the garage and attic is tidy but more work; up the outside wall is quicker.
• Fan power. Tighter soils need stronger fans.
• Access. Finished basements, built-ins, and HVAC equipment in the crawl space can complicate things.

After it's installed

• Electricity: the fan runs continuously; ask for the wattage.
• Sound: a low hum is normal; rattles usually mean a loose pipe or mount.
• Monitoring: check the manometer when you change HVAC filters.
• Membrane care: if contractors crawl under the house, make sure they don't tear the barrier, and patch it if they do.
• Retesting: every couple of years and after major remodels.

Should I just open the crawl space vents?

Ventilation can lower radon somewhat, but results are unreliable, and in Middle Tennessee's humid summers, open vents bring in moisture. For levels at or above 4 pCi/L, an active system is the dependable fix.

Ready to talk?

Call or send the form with your ZIP, foundation type, and test result. We'll connect you with an independent, certified radon professional who serves your part of Rutherford County.

Rutherford County soils and system design

Much of Rutherford County sits on limestone with clay-rich soils above it, and in some areas, such as the cedar glades, the rock is close to the surface. For mitigation, that matters in two ways. Dense clay under a slab can limit how far suction spreads, sometimes calling for a second suction point or a stronger fan. Shallow rock can make digging a suction pit under a slab or trenching under a crawl space membrane harder. Diagnostics before quoting help a certified mitigator plan for both.

Mitigation questions from Murfreesboro homeowners

Can the fan go in my attic?

Usually yes. An attic is a common fan location in Middle Tennessee homes because it keeps the fan out of the weather and lets the pipe exit through the roof. It must not be in the living space.

Will a system help with crawl space humidity?

A radon membrane covers the soil, which can reduce moisture coming up from the ground, but a radon system isn't a dehumidification system. If moisture is a separate problem, ask about combining the two.

Where this information comes from

• EPA: Radon Frequently Asked Questions
• EPA: Health Risk of Radon
• EPA Map of Radon Zones, county data (Rutherford County, TN: Zone 1)
• Tennessee Department of Environment and Conservation: Tennessee Radon Program
• Angi: How Much Does a Radon Mitigation System Cost? (2026 national data)
• EPA: Find a Radon Test Kit or Measurement and Mitigation Professional