New Construction Radon Systems in Slater, IA

New construction radon in Slater, IA runs on the same July 1, 2026 dividing line as the rest of the state. Iowa’s HF 2297 now requires a passive radon mitigation system, the sub-slab-to-roofline vent pipe, in every newly permitted single-family home and duplex, passed nearly unanimously by a legislature that finally called the 8.5 pCi/L statewide average what it is. Slater’s share of new construction is modest, a build here, an infill there, but each one now arrives with infrastructure that no Story County house before it was required to have, because this county never adopted a local rule of its own.

What the pipe does and doesn’t promise in Slater soil

Passive systems move soil gas on natural stack draft, and southwest Story County’s till, uneven clay and gravel that channels gas unpredictably, is exactly the opponent that makes draft-only outcomes a coin flip. The law mandates the pipe, not the number, and leaves the exam to the owner: a 48-hour test in the first closed-house winter, roughly November through April, tells you whether the stack is winning. Pass, done, cheapest radon outcome in Iowa history. Fail, and the finish is an inline fan in the pipe the builder already ran, wiring, manometer, retest, the trade’s smallest ticket.

One Slater-specific detail deserves builder attention: the sump. Central Iowa construction puts a pit and drain tile in every new basement, and a passive system lives or dies by the sump lid’s seal, an unsealed lid short-circuits the draft before it starts. Buyers of new Slater builds should check that lid before checking anything else.

Everything built before

Which is nearly all of Slater: pre-law homes carry standard county odds, 71.6% of Iowa homes at or over 4.0, no head start, and retrofit the proven way, sub-slab depressurization, often through that same sump, one day, four figures, retested proof.

Iowa Code 136B credentials the work for hire, activation through retrofit. New-law questions answered free across Slater and the southwest county: bring the permit date, and if it’s a new build, a photo of the sump lid.