Radon Mitigation in Harvest, Meridianville & Hazel Green, AL

North of Huntsville, Madison County opens into a mix of new subdivisions and older rural property. Harvest, Toney, Meridianville, Hazel Green and New Market are unincorporated communities, which means building and electrical permits come from Madison County rather than a city. Many homes here sit on crawl spaces or older block foundations, some still draw from private wells, and new construction keeps spreading along U.S. 231/431 and the roads between Harvest and Hazel Green. This page covers what that mix means for radon. We're a free referral service, not a contractor. We connect you with independent, certified professionals who quote and perform the work.

The radon picture north of Huntsville

All of these communities are in Madison County, which the EPA puts in Zone 1 and ADPH lists among Alabama's 15 highest-potential counties. CDC tracking data for 2008 to 2017 shows about one in four tested Madison County buildings at or above the EPA action level of 4 pCi/L. That's a countywide figure. There's no public ZIP-level data that can tell you whether Harvest reads higher than Hazel Green, and not enough homes in each community are tested to say. What matters more is the house: its foundation, the soil right under it and how air moves through it.

Historical data points the same way. During the Alabama Cooperative Extension radon program in the late 1990s, Madison County had the highest share of returned test kits at or above 4 pCi/L of any county in the program, 46.7%, compared with 22% across all kits analyzed. That was a self-selected group of homeowners, not a survey, but it's one more reason people in the county are told to test.

Housing types and the fix each one needs

Crawl space homes

Older farmhouses, mid-century ranches and many manufactured or modular homes in the north county sit over a crawl space with bare soil or a thin vapor barrier. The standard fix is sub-membrane depressurization: a heavy, sealed plastic membrane over the soil with a fan drawing air from beneath it. Cost depends heavily on crawl space area and how much room there is to work. If a contractor is also selling full encapsulation for moisture, ask for the radon portion as its own line item so you can compare.

Newer slab subdivisions

The newer neighborhoods around Harvest and Meridianville are mostly slab-on-grade. Those homes usually take a standard sub-slab system. Some were built with a passive pipe already in place; see adding a fan to a passive system.

Mixed foundations

Additions are common on rural properties: a slab family room added to a crawl space house, or a finished garage. Each part may need its own suction point, tied to a single fan where the layout allows.

Manufactured homes

Manufactured homes on piers can still collect radon, especially when skirting encloses the space underneath. Testing works the same way. Mitigation options depend on whether the space under the home can be sealed with a membrane, so ask the mitigator to look before quoting.

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Private wells

Most of Madison County is on public water, but some properties in the north and east county still use private wells. Radon dissolved in well water is released into the air during showers, laundry and dishwashing. The EPA says radon from water is usually a much smaller contributor than radon from soil. Still, if you're on a well and your air test is high, it's worth testing the water too, so the fix addresses the real source. Radon in water is treated differently, usually with aeration or carbon filtration where the water enters the house.

County permits

Because these communities are unincorporated, permits come from the Madison County Building and Fire Inspection Department, which takes permit applications and schedules inspections online through its CityView portal. The county's published permit list includes electrical work, disconnections and modifications, along with mechanical and building work. A radon fan wired to a new circuit or a new exterior outlet is electrical work. Plugging into an existing approved outlet may not be. The county lists exemptions in a county resolution and asks anyone who isn't sure to contact the department before starting. Your installer should know the current rules, so ask which permits they'll pull and whether the fee is in the price. Our permit and licensing guide compares the county, Huntsville and Madison.

Getting a reliable test

ADPH notes that north Alabama has a lot of karst geology, rock that water has partly dissolved into fractures and caves, and that radon levels can be extremely variable in karst areas. ADPH publishes separate testing instructions for karst areas for that reason. In practice, a single short-term test is a weak basis for a big decision. Many owners in the north county run a second short-term test or a long-term test before choosing a fix, unless a sale deadline forces the issue.

Test in the lowest lived-in level, keep windows and doors closed for 12 hours before and during a short test, and avoid testing during severe storms. ADPH's free kit program (one per household while supplies last, with almost $5 in return postage) is a good first step for homeowners who aren't in a real estate deal.

Costs

EPA guidance puts most radon reduction systems at about $800 to $2,500. Crawl space systems tend to land toward the higher end of typical ranges because of membrane area and labor. See our radon mitigation cost guide for what drives a quote.

Frequently asked questions

Who issues permits for a radon system in Harvest or Meridianville?

These are unincorporated communities, so permits come from the Madison County Building and Fire Inspection Department through its CityView portal. The county's permit list includes electrical work. Ask your installer which permits apply to your system.

My Hazel Green house has a crawl space. How is that fixed?

Usually with sub-membrane depressurization: a sealed plastic membrane over the crawl space soil with a fan drawing from beneath it. Cost depends mostly on crawl space size and access.

Should I test my well water for radon?

If your air test is high and you're on a private well, yes. The EPA says water usually contributes much less radon than soil, but a water test tells you whether you also need treatment where the water comes in.

Why do two tests in my house disagree?

Radon changes with weather, season and how the house is used. ADPH notes that north Alabama's karst geology can make levels extremely variable. Use a follow-up or long-term test before deciding, unless a deadline forces the decision.

Does a manufactured home need radon testing?

Yes. Any home with a lived-in level near the ground can collect radon, especially when skirting encloses the space underneath. Testing works the same way.