EPA Zone 2 · Brookings County, SD
Radon Testing & Mitigation
in Brookings, SD
Brookings County sits in EPA Zone 2 — a designation that still includes many homes above the 4.0 pCi/L action level. Whether you're near SDSU, in Volga, or in rural Brookings County, the only way to know your home's level is to test it.
What We Offer
Radon Services in Brookings
Every radon service for Brookings County homes — from initial testing to mitigation system installation and fan replacement.
Radon Testing — Brookings
Short-term and long-term options for Brookings County homes. Written results within 24 hours. EPA-approved methodology for reliable results.
View testing options →Radon Mitigation — Brookings
Sub-slab depressurization systems installed in a single day. Post-installation verification test included with every mitigation.
View mitigation options →Fan Replacement — Brookings
Replace a failing radon fan in your existing mitigation system. All brands compatible. Post-replacement test confirms restored performance.
View fan replacement →Real Estate Testing — Brookings
Fast-turnaround transaction reports for buyers, sellers, and agents in the Brookings real estate market. Direct agent coordination available.
View real estate testing →Commercial Testing — Brookings
Multi-point testing for offices, university-adjacent buildings, daycares, and commercial properties in the Brookings area. Written compliance reports.
View commercial testing →Local Radon Context
Radon Risk in the Brookings Area
What Brookings County homeowners and renters should know about radon.
Brookings County is designated EPA Zone 2, which reflects a predicted average indoor radon level between 2.0 and 4.0 pCi/L. Zone 2 is not a "safe" designation — it means the county average falls in that range, and individual homes in any Zone 2 county routinely test above the 4.0 pCi/L action level. Testing is the only way to know a specific home's actual level.
The geology underlying Brookings County includes glacial till deposited across the Prairie Coteau — a elevated glacial plateau stretching from Minnesota through eastern South Dakota. Glacial till is permeable and allows soil gases including radon to move toward building foundations. Homes with basements or slab foundations over glacial soils are the most common radon-entry scenarios.
Older homes near the SDSU campus and downtown Brookings may have more foundation entry points due to aging construction and settling. Newer homes in expanding residential areas to the west and south of downtown face the same underlying geology. Rental properties are not tested more frequently than owner-occupied homes, despite high turnover — which means many renters are unaware of their home's radon level.
The tight winter construction typical of Brookings-area homes — closed windows, reduced air exchange — contributes to radon accumulation during the heating season. Winter testing often reflects the most representative worst-case reading for a home.
Zone 2
EPA Radon Zone — Brookings County
4.0
pCi/L — EPA recommended action level
SD
Among highest median indoor radon in the US
24 hrs
Written results after device retrieval
Why Choose Us
What Sets Our Brookings Service Apart
Six reasons Brookings County homeowners and real estate professionals choose us for radon testing and mitigation.
Brookings County Coverage
We serve Brookings, Volga, White, Aurora, and surrounding Brookings County communities — not just the city of Brookings.
All Testing Types
Short-term, long-term, real estate transaction, and commercial multi-point testing available for every situation and timeline.
Written Reports Included
Every service includes a written report with results, context, and clear next-step recommendations.
Transparent Pricing
Clear pricing ranges with no hidden fees. We review what's included before any work begins.
Same-Day Scheduling
Most appointments scheduled within 24–48 hours. Same-day service available when the schedule allows.
Family-Centered Approach
Plain-language results, honest answers, and the same care we'd want for our own family's home.
Service Coverage
Areas We Serve in and Around Brookings
Service area map — Brookings County, SD
Neighborhoods & Communities Served
- Downtown Brookings
- SDSU Campus Area
- West Brookings
- South Brookings
- Volga
- White
- Aurora
- Elkton
- Medary Township
- Sinai Area
ZIP Codes Served
Ready to Test Your Brookings Home?
Zone 2 still means real risk — and many Brookings homes test above 4.0 pCi/L. The only way to know is to test. Most appointments within 24–48 hours.
Eastern South Dakota
We Also Serve Nearby Cities
Radon services across eastern South Dakota — not just Brookings.
Common Questions
Brookings Radon FAQs
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Brookings County is designated EPA Zone 2, reflecting a predicted average indoor radon level between 2 and 4 pCi/L. Zone 2 does not mean low risk — many homes in Zone 2 counties test above the 4.0 pCi/L action level. The glacial geology underlying Brookings County contributes to elevated radon potential, and individual testing is the only reliable way to determine your home's actual level.
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Radon levels in the Brookings area vary by individual home, not proximity to SDSU or any other landmark. Older homes near campus may have more foundation entry points due to settling and aging construction. Rental properties — common near a university — are frequently untested despite high tenant turnover. If you're renting in Brookings, asking your landlord about radon testing is a reasonable starting point.
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Agricultural fields themselves don't directly elevate radon in adjacent homes, but the same glacial till and Prairie Coteau geology that underlies farmland also underlies residential areas throughout Brookings County. Radon risk is primarily driven by what's under a specific home's foundation — which varies more by local soil composition and foundation type than by surrounding land use.
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Age alone doesn't determine radon levels. Older homes may have more radon entry points — foundation cracks from settling, unfinished basement sections, deteriorating sump pit covers. But newer homes can also test high. New construction in Zone 2 counties like Brookings may include passive radon-resistant features, but passive systems don't guarantee levels below 4.0 pCi/L. Testing a specific home is always more informative than estimating by age.
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In winter, Brookings homes are sealed tighter for heating — reducing the natural air exchange that can dilute indoor radon. Simultaneously, frozen ground can redirect soil gases toward building foundations more forcefully. The combination tends to push radon levels higher during heating season. Winter testing often reflects the most representative worst-case reading for a home and is a reliable time to test if you're concerned.
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We typically schedule Brookings-area appointments within 24–48 hours of inquiry. Same-day scheduling may be available. For short-term tests, written results are delivered within 24 hours of device retrieval. Real estate transaction appointments are prioritized to meet closing timelines — contact us with your closing date and we'll work backward from there.