Ziebach County, SD radon potential

Ziebach County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally that's the 34th percentile for radon potential — Ziebach County outranks 34% of every county EPA has rated.

Ziebach County by the numbers

Ziebach County, South Dakota is home to about 2,418 people across 1,961.248 square miles. Averaged across its land area, Ziebach County runs about 1 people per square mile. Within its own EPA zone, Ziebach County is bigger by population than 3% of the counties that share it. Geologically, Ziebach County is grouped into EPA Region 8 alongside 290 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Ziebach County's Zone 2 prediction lands in the gap between the two. A county-wide moderate average, like Ziebach County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Ziebach County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find South Dakota's state radon program

For Ziebach County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Ziebach County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Ziebach County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.