Radon Mitigation in Rathdrum, ID

Rathdrum sits on the northwest edge of the Rathdrum Prairie, at the foot of granite Rathdrum Mountain. In Idaho DHW test results by ZIP code, updated through 2019, 626 of 1,014 home radon tests in 83858 reached 4.0 pCi/L or more. That 62% is higher than in Coeur d'Alene, Post Falls or Hayden, and the town has grown fast since 2020.

Or call (509) 278-2215

48-hour test from $195 · Systems from $1,295 · Post-mitigation test included

How it works in Rathdrum

1. STEP 1
   Test

   A 48-hour continuous monitor in your lowest living level, under closed-house conditions. Report the same day it comes out.

2. STEP 2
   Look and quote

   We check the foundation, run a suction test and plan the pipe route for Rathdrum winters. You get a fixed price in writing.

3. STEP 3
   Install

   Most systems take one day: suction point, sealing, fan, manometer and the electrical permit.

4. STEP 4
   Re-test

   A post-mitigation test at least 24 hours after the fan starts shows the new number. The guarantee is below 4.0 pCi/L.

Radon mitigation cost in Rathdrum

Most Rathdrum jobs are young single-family homes on deep, coarse gravel, where one suction point often does the work; homes on the silty eddy bars may need more. On Kootenai Electric's Peak Use rate, peak-hour demand above 5 kW costs extra; for a member already past that line, a 60-watt fan adds about $4 a year. Its Traditional rate has no peak charge.

Starting prices include the electrical permit and the post-mitigation test. Bold: systems common in Rathdrum homes. Estimate your system →

for a typical 60-watt fan running around the clock, depending on which utility serves your address. Energy charge only, at 2026 residential rates.

A 20-watt fan costs about a third of that, a 90-watt fan half again as much.

Permits and local rules in Rathdrum

Rathdrum at a glance

Area figures describe the neighborhood, not your home. Only a test tells you your number. Sources are listed at the end of this page.

Granite above, deep gravel below

Rathdrum Mountain, about 5,000 feet high, rises just north of town. It is Eocene granite and gneiss, part of a large granitic body north of the prairie, and it weathers to grus, a sandy silt; frost has shattered its bedrock into fields of cobbles and boulders. The USGS radon assessment for the region lists homes on granite or gneiss, or on sediment eroded from them, as suspect for higher radon.

Below the mountain, the Ice Age floods built bouldery pendant bars in the lee of the Round Mountain knob: the gravels of Twin Lakes and Rathdrum Creek, 80 to 120 feet thick. In side valleys such as Hidden Valley and Howell Gulch, eddy bars trapped finer slack-water silt, up to 200 feet of it. So within a few miles, homes sit on boulders, on silt or on weathered granite.

The prairie itself is deep and coarse here. Two wells southwest of town logged only coarse material for their top 515 feet, and on the northern prairie the water table lies as much as about 500 feet down. Toward the aquifer's west margin, some wells struck clay layers, one of them 80 feet thick. A neighbor's result on different ground tells you little about yours.

about this far down to the water table in parts of the northern Rathdrum Prairie, where it lies deepest⁶

Rathdrum questions