Radon Mitigation in Maple Grove, MN

Built on Old Gravel Pits

For decades the middle of Maple Grove was mined for sand and gravel, and the ponds and lakes around Arbor Lakes are what the mining left behind. Around them the city is built on glacial deposits that range from coarse gravel to tighter till. Sub-slab material matters for radon both ways: loose, gravelly ground lets soil gas travel to a foundation easily, and it also lets a mitigation fan draw from much further under the slab through a single suction point.

Mostly Newer Housing

Maple Grove grew mainly from the 1980s onward, and a large share of its houses were built after June 2009, when Minnesota started requiring a passive radon system in new homes. The typical house is a two-storey or walkout on a full basement, often finished. Older neighborhoods from the 80s and 90s have no passive pipe, so a system there means a full install.

Walkouts and Look-Outs

Walkout and look-out basements are common where the ground rolls toward the lakes and wetlands. The walkout level is part above grade on one side, but its floor and uphill wall are against soil, and it is usually the most-used room in the house. It is the lowest lived-in level and the place to test. It also makes the pressure field lopsided, so suction point placement needs more thought than on a flat lot.

Wet Ground and Sump Baskets

Lots near the city's many ponds and wetlands often have a high water table and a sump pump that runs through the spring melt. A sealed, radon-rated sump lid lets the pump keep working while closing the basket off as an opening. Sometimes the drain tile itself can be used for suction; sometimes water in the fill means the suction point goes elsewhere. We check before designing.

Working in Maple Grove

We cover the whole city. Begin with a 48-hour test in the lowest lived-in level. For a post-2009 house that reads high, adding a fan to the passive pipe is usually the fix; older houses get a full system, with the sump sealed.

Maple Grove Radon FAQs