Radon Mitigation in Dell Rapids, SD

Call (605) 210-7667 Minnehaha County, 22 miles from Sioux Falls, population about 3,900.

The quartzite town. Built from the rock it sits on, which is the most direct radon geology story in the metro.

Why radon is a problem in Dell Rapids

Commercial quarrying of Sioux Quartzite started here in 1875, and the reason is that the bedrock is at or near the surface where the Big Sioux cuts through the Dells. Very little glacial cover, heavily fractured Precambrian rock, and joints that carry soil gas straight up. If you want to understand why eastern South Dakota is in EPA Radon Zone 1, stand at the Dells and look at the rock face.

What Dell Rapids housing is built like

Downtown Dell Rapids was rebuilt in quartzite after a fire, and a lot of the older residential stock has quartzite or block foundations with stone rubble and uneven slabs poured later. Newer subdivisions on the edges are conventional poured walls.

Old quartzite and rubble foundations do not seal like poured concrete. Systems here need more sealing work and a diagnostic suction test rather than an assumption.

Who calls us from Dell Rapids

This is the town where the geology explains itself. Anyone who has stood at the Dells and looked at the rock face understands why eastern South Dakota is in EPA Radon Zone 1 without needing a diagram. What that means practically is that Dell Rapids houses need real diagnostics rather than assumptions, particularly the older ones built on and out of the quartzite.

Local landmarks and roads in our service area

Crews working Dell Rapids cover the Dells of the Big Sioux River, the L.G. Everist quarries, the D&I Railroad line, Dell Rapids High School, Fourth Street, South Dakota Highway 115 and the quartzite storefronts on Main, and the surrounding rural addresses in Minnehaha County.

Radon services available in Dell Rapids

• Radon Mitigation Systems in Dell Rapids, SD

  Sub-slab depressurization systems installed in a day, tested after, guaranteed under 4.0 pCi/L.

• Radon Testing in Dell Rapids, SD

  Short-term and long-term testing, plus post-mitigation verification tests with lab documentation.

• Dell Rapids Fan Replacement & Repair

  Dead fan, dropped manometer, howling pipe, or a system somebody else installed wrong.

• Dell Rapids Finished Basement Systems

  Routing a system through a finished lower level without tearing out drywall you paid for.

• Crawl Space Systems in Dell Rapids

  Sealed vapor barrier over exposed soil, then sub-membrane depressurization.

• Dell Rapids Sump Pump Sealing

  Airtight sump lids with a viewing port and float access, tied into the radon system.

• New Construction & Passive Systems in Dell Rapids

  Pre-slab rough-ins for builders, and activating passive stacks that were never finished.

• radon in well water for Dell Rapids homes

  Aeration and GAC systems for acreages and rural homes on private wells.

What is particular about Dell Rapids

Commercial quarrying of Sioux Quartzite started here in 1875 because the bedrock is at or near the surface where the river cuts through the Dells, and Main Street was rebuilt in that same stone after a fire. The L.G. Everist quarries and the D&I rail line are still working it. For radon purposes what matters is that the rock is heavily jointed and the glacial cover is thin, so soil gas travels up through open fractures into whatever is built on top. Standing at the Dells explains the readings better than any diagram could.

Common questions from Dell Rapids

Scheduling and travel

Twenty-two miles north on Highway 115, grouped with Baltic and Colton trips. Expect a longer estimate visit here than in a newer town, because the foundations vary enough that a short look produces a wrong number.

Ready for a number? Call (605) 210-7667 or send the form. Background on pricing is in our Sioux Falls radon cost guide, and the full service list is on the services page.