Radon Mitigation in Oronoco, MN
Radon testing and mitigation in Oronoco.
Oronoco wraps around Lake Zumbro, and a lot of the housing here is tied to the water in one way or another. Older lake cabins that got converted to year-round homes, newer builds on lots with a view of the river, and rural acreage homes outside the city limits. The basements vary as much as the homes do.
Lake homes and what they bring with them
A lake cabin that was converted to a year-round home has a foundation story that's usually written across decades. The original structure may have been built on piers, then closed in. A slab may have been poured later. A finished basement may have been added in the 1970s and updated again in the 2000s.
The newer homes along the highway corridor and on the edges of town look closer to a Pine Island or Byron build. Poured foundations, post-2009 passive radon prep, and the kind of consistent layouts that come from a small set of builder packages.
Olmsted County is a Zone 1 radon county, and indoor radon levels in Oronoco trend in line with the rest of the county. The lake itself doesn't change that. The rock under the homes is what matters, and that's the same regional limestone profile.
Oronoco at a glance
Radon work for a small town built around Lake Zumbro, with a housing mix that runs from old lake cabins to newer year-round homes.
- Housing
- A mix of older lake-area homes, rural acreage properties, and newer subdivision builds, including communities that have grown along the Zumbro River and Lake Zumbro shoreline.
- Geology
- The same regional bedrock as Rochester, with thinner soil cover on some of the rural sites and along the river bluffs.
- Median radon (Oronoco)
- 4.3 pCi/L , above the EPA action level 58 tests/yr avg, MDH 2014–2023
- Olmsted County ≥ 4 pCi/L
- 42.3% of tested homes Ranks #54 of 87 MN counties
- Distance from Rochester
- About 10 miles north
- Defining feature
- Lake Zumbro and the Zumbro River
- Housing mix
- Lake homes, rural acreage, subdivision
What the radon numbers actually say in Oronoco
Across the testing the Minnesota Department of Health, Radon Testing public dataset has on file for Oronoco (2014–2023), the median home reads 4.3 pCi/L. That is above the EPA action level of 4 pCi/L. The geometric mean comes in at 3.6 pCi/L. That is a log-scale average that tends to track better when the distribution has a long upper tail, which radon distributions always do.
Zoom out to Olmsted County. 42.3% of tested homes in the county come back at or above 4 pCi/L. That ranks Olmsted County #54 of 87 Minnesota counties for the share of homes above the action level. A separate 68.3% of tested homes are at or above 2 pCi/L, which is the threshold the Minnesota Department of Health uses when it recommends action.
About 58 Oronoco homes get tested every year on average, drawing from a stock of roughly 3,079 housing units. The number above is not a forecast for your specific home. Radon varies house to house even on the same street. The number is a reasonable starting line for the conversation, not a prediction. See the full data set for the by-county and by-tract picture.
Three steps. On your timeline.
Measure your radon level.
We start with a measurement of what is actually in the air your family breathes. You see the result we see, and we walk through what it means in plain language.
You see the picture first.
Once you have the result, we talk through what your home is dealing with. No scripts, no pressure. You decide what to do next on your own timeline.
A conversation about your home.
If you want to take action, we look at the basement together and talk through what a plan for your foundation could look like. Every home is its own conversation.
Other towns we cover.
Pine Island
Pine Island has been adding new housing for years and has plenty more on the way. The town recently annexed land for a development with around 200 single-family lots, plus medium and high density housing on top of that. The radon question for these homes looks different than it does in the older parts of town.
Zumbrota
Zumbrota has the only original covered bridge left in Minnesota, a downtown that has been continuously occupied since the 1850s, and a real estate market shaped in part by Mayo Clinic commuters. The housing here covers a wider span than the population would suggest.
Byron
Byron has roughly doubled in size since 2000, and most of the housing here is younger than the kids in it. For a lot of homeowners in town, the radon question is something they're thinking about for the first time, often after a coworker brought it up or a neighbor mentioned a test.
Find out your radon levels with a free radon test.
About 42% of tested Olmsted County homes come back above the EPA action level. The surrounding counties are higher. The first step is knowing where yours sits, and that is the part we do for free.