Radon Mitigation in Liberty Lake, WA

Liberty Lake has one of the newest housing stocks around Spokane, with a median build year of 2005. About a third of its homes went up in 2010 or later, under state rules that ready a new house for a radon fan. Even so, 37.4% of reported radon tests reached 4.0 pCi/L or more in the census tract that covers most of ZIP 99019.

Or call (509) 278-2215

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

How it works in Liberty Lake

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 Liberty Lake 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 Liberty Lake

Avista Utilities is Liberty Lake's electric provider, according to the city's comprehensive plan, so every fan here runs on Avista's Washington rate. Many houses in town already have a vent pipe, and adding a fan to it is the least expensive route. Near the lake outlet, where silt can tighten the soil, the pressure-field test before the quote shows whether a second suction point is needed.

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

for a typical 60-watt fan running around the clock. 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 Liberty Lake

Liberty Lake 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.

Gravel, gneiss and lake silt: the ground under Liberty Lake

The lake owes its existence to the Ice Age floods. A gravel bar the Missoula floods dropped across the mouth of a side valley holds the water in, the same way bars along the valley edge hold Newman, Hauser and Hayden lakes. North of the lake, toward the Spokane River, the town sits on river alluvium and gravel laid down in a flood channel. Near the state line that aquifer gravel runs about 400 to 600 feet thick, and the water table lies roughly 150 feet down.

The lake end of town is where Liberty Lake parts ways with the central Valley. Well logs at the lake's outlet show pockets of silt and clay, so one lot can sit on open gravel and the next on a tighter mix. That changes how air moves under a slab in both directions: the soil gas working its way toward the house, and the suction a mitigation fan tries to spread beneath it.

South of town the land climbs toward Mica Peak on old Hauser Lake Gneiss, a banded schist and gneiss cut by pegmatite dikes and laced with bodies of Mount Rathdrum quartz monzonite and granite. A house on those slopes stands on different ground than one on the valley floor. Because one tract covers nearly all of the 99019 ZIP, the state data give a single number for slopes, lakeshore and flats alike. A test in the house is what tells them apart.

of aquifer gravel near the state line, with the water table about 150 feet down⁶

Liberty Lake questions