Montana Radon Mitigation Cost by County, Foundation, and Rules
Compare typical local price ranges for basement, slab, and crawl space systems. Use the state-level ranges first, then open your county when you need a local estimate after a confirmed radon result.
Fastest Start
Use ZIP Instead of Scrolling
If you know the property ZIP, jump straight to the right county estimate instead of browsing the full state list.
Cost Basics
Foundation & Result Ranges
Use the national cost guide if you need basement, slab, crawl-space, or 4.0+ result context first.
Validate the Risk
Check MT Radon Levels
If you do not have a confirmed radon result yet, review EPA zone context before you compare mitigation pricing.
Browse Counties
Jump to County Pricing
Open your county if you already know the area and just need a local basement, slab, or crawl-space price range.
Official State Resource
Montana radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure note
Montana does not have specific radon disclosure requirements. General property disclosure laws apply.
Credential note
Montana does not require state licensing for radon professionals.
MT Cost Starting Point
Montana cost range by foundation
Basement
$890-$1583
Use this when the home has a basement or lowest-level slab that supports a standard sub-slab suction system.
Slab-on-Grade
$841-$1485
Slab homes can price differently when finished space, routing, or core drilling complicates the system path.
Crawl Space
$1388-$2530
Crawl-space jobs can move higher when vapor-barrier sealing, access, and sub-membrane suction add labor.
State rules that can change the quote
Disclosure: No broad state disclosure requirement is modeled here. Montana does not have specific radon disclosure requirements. General property disclosure laws apply.
Mitigation licensing: No state-specific mitigation license premium is modeled. Montana does not require state licensing for radon professionals.
EPA zone mix in Montana
49
Zone 1
7
Zone 2
0
Zone 3
56 classified counties are used for state-level risk context. EPA zones do not replace a home test, but they help explain why county pages and confirmed 4.0+ results matter before comparing quotes.
Local cost guides
Montana evidence-backed cost route
The cost directory follows the same eligibility rule as the county cost pages themselves. State hubs, sitemap candidates, and internal links point at pages Google can actually index.
56
Listed
56
Evidence
56
Measured
Best county pages to open first
Yellowstone County
Evidence-backed local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 42.4% 4.0+
Yellowstone County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 42.4% 4.0+ with a local housing base of 72,252 units and a modeled planning range of $890-$1583.
Missoula County
Evidence-backed local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 44.6% 4.0+
Missoula County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 44.6% 4.0+ with a local housing base of 55,084 units and a modeled planning range of $890-$1583.
Gallatin County
Evidence-backed local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 42.8% 4.0+
Gallatin County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 42.8% 4.0+ with a local housing base of 53,605 units and a modeled planning range of $890-$1583.
Flathead County
Evidence-backed local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 37.8% 4.0+
Flathead County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 37.8% 4.0+ with a local housing base of 50,252 units and a modeled planning range of $890-$1583.
Cascade County
Evidence-backed local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 29.4% 4.0+
Cascade County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 29.4% 4.0+ with a local housing base of 39,022 units and a modeled planning range of $890-$1583.
Lewis and Clark County
Evidence-backed local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 61.8% 4.0+
Lewis and Clark County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 61.8% 4.0+ with a local housing base of 33,589 units and a modeled planning range of $890-$1583.
Ravalli County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 44.6% 4.0+
Ravalli County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 44.6% 4.0+ with a local housing base of 21,007 units and a modeled planning range of $890-$1583.
Silver Bow County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 70.1% 4.0+
Silver Bow County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 70.1% 4.0+ with a local housing base of 17,303 units and a modeled planning range of $890-$1583.
Lake County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 40.3% 4.0+
Lake County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 40.3% 4.0+ with a local housing base of 16,436 units and a modeled planning range of $890-$1583.
Lincoln County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 51.4% 4.0+
Lincoln County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 51.4% 4.0+ with a local housing base of 10,993 units and a modeled planning range of $890-$1583.
Park County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 60% 4.0+
Park County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 60% 4.0+ with a local housing base of 9,564 units and a modeled planning range of $890-$1583.
Fergus County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 72.4% 4.0+
Fergus County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 72.4% 4.0+ with a local housing base of 6,009 units and a modeled planning range of $890-$1583.
Sheridan County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 75.7% 4.0+
Sheridan County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 75.7% 4.0+ with a local housing base of 2,051 units and a modeled planning range of $890-$1583.
Sanders County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 50% 4.0+
Sanders County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 50% 4.0+ with a local housing base of 6,813 units and a modeled planning range of $890-$1583.
Madison County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 50% 4.0+
Madison County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 50% 4.0+ with a local housing base of 6,424 units and a modeled planning range of $890-$1583.
Carbon County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 52.2% 4.0+
Carbon County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 52.2% 4.0+ with a local housing base of 6,399 units and a modeled planning range of $890-$1583.
Custer County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 40.7% 4.0+
Custer County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 40.7% 4.0+ with a local housing base of 5,770 units and a modeled planning range of $890-$1583.
Richland County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 78.6% 4.0+
Richland County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 78.6% 4.0+ with a local housing base of 5,559 units and a modeled planning range of $890-$1583.
Deer Lodge County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 30.8% 4.0+
Deer Lodge County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 30.8% 4.0+ with a local housing base of 5,485 units and a modeled planning range of $890-$1583.
Jefferson County
Cost eligible local evidence
$890-$1583
CDC EPHT Network Radon Tests from Labs: 71% 4.0+
Jefferson County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 71% 4.0+ with a local housing base of 5,359 units and a modeled planning range of $890-$1583.
County estimates
Open a Montana county page for local pricing
County pages narrow the state range with local EPA zone context, housing data, state rules, and the foundation scenario you choose.
Why Does Cost Vary in Montana?
Price ranges across Montana move with local labor rates, permit friction, roofline routing, and foundation type. County pages narrow this down for homeowners comparing basement, slab, or crawl space mitigation after a confirmed radon reading.