All Phase Radon LLC — NRPP Certified Radon Mitigation in Colorado
Locally owned radon mitigation contractor serving the Denver metro,
the Colorado foothills, Fort Collins, and Colorado Springs. NRPP
& Colorado State certified. 20-year transferable warranty. 100%
success rate across 1,500+ installations. Free estimates — call
(720) 737-8627.
About All Phase Radon
All Phase Radon is a locally owned and operated radon mitigation
company based in Pine, Colorado. Owner Ryan Tereshko is NRPP and
Colorado State certified and personally oversees every installation.
Since 2019 we have installed more than 1,500 active radon mitigation
systems across the Denver metro and Colorado mountain communities
with a 100% success rate — every system we install is guaranteed to
bring indoor radon levels at or below 3.9 pCi/L, backed by a 20-year
transferable warranty.
Business address: 13732 Jubilee Trl, Pine, CO
80470
Phone: (720) 737-8627
Email: info@allphaseradon.com
Hours: Monday–Friday 8:00 AM – 5:00 PM Mountain
Radon Mitigation Services
All Phase Radon does not provide radon testing. We specialize
exclusively in radon mitigation — reducing radon gas that has
already entered a home. Our four core services are listed below.
1. Radon Mitigation System Installation
The most common method of radon mitigation is Active Soil
Depressurization (ASD). An ASD system uses PVC piping attached to an
in-line radon fan. The piping begins below the lowest floor of the
foundation and extends upward to an exhaust point above the
roofline, where the collected radon is safely diluted by outdoor
air. Price range: $1,399–$1,699. Includes a 20-year transferable
warranty.
Learn more about radon mitigation installation.
2. Radon System Service & Repair
We inspect and repair existing radon mitigation systems of any brand
and any age — including fan diagnostics, pipe and seal repair, sump
lid re-sealing, manometer and pressure issues, system re-routing,
and troubleshooting. Common signs a system needs repair: the
manometer reads zero pressure, the fan is silent, unusual noise or
vibration, or indoor radon levels climbing back above the action
level.
Learn more about radon system repair.
3. Radon Fan Replacement — Starting at $549
When an existing radon fan becomes loud, starts vibrating, or stops
working entirely, we replace it with a premium ultra-quiet model
backed by an 8-year manufacturer warranty. Signs a fan needs
replacement: buzzing or grinding noise, visible vibration, the fan
housing is hot to the touch, or the system has lost suction.
Learn more about radon fan replacement.
4. Passive to Active Radon System Conversion
Many newer Colorado homes are built with a passive radon system —
PVC pipe routed through the foundation but without a fan. A passive
system relies on natural draft alone, which is often not enough to
keep radon below the action level. We convert passive systems to
active by adding a certified in-line fan, transforming a
builder-installed pipe into a fully functioning mitigation system.
Learn more about passive-to-active conversion.
Cities & Areas Served in Colorado
All Phase Radon serves the Denver metropolitan area, the central
Colorado foothills, and two extended service areas to the north and
south. Below are the 13 communities we currently serve, with local
radon levels and risk data.
Denver — Denver County
Average radon level: 5.8 pCi/L (1.5x the EPA action level of 4.0
pCi/L). High risk. Denver's alluvial soils and varied foundation
styles mean radon levels spike unpredictably from neighborhood to
neighborhood.
Radon mitigation in Denver.
Evergreen — Jefferson County
Average radon level: 11.2 pCi/L (2.8x the EPA action level). Extreme
risk. Evergreen's granite bedrock and high mountain elevation create
some of the highest radon levels recorded in foothills homes.
Radon mitigation in Evergreen.
Bailey — Park County
Average radon level: 14.3 pCi/L (3.6x the EPA action level). Extreme
risk. Bailey sits on decomposed Pikes Peak granite bedrock that
emits massive concentrations of radon gas — nearly 4x the action
level.
Radon mitigation in Bailey.
Conifer — Jefferson County
Average radon level: 12.8 pCi/L (3.2x the EPA action level). Extreme
risk. Conifer homes built on fractured granite bedrock routinely
measure extremely elevated radon levels, amplified by the winter
stack effect.
Radon mitigation in Conifer.
Pine — Jefferson County
Average radon level: 13.5 pCi/L (3.4x the EPA action level). Extreme
risk. All Phase Radon is based right here in Pine. Uranium-rich
granite rock fissures discharge high radon levels straight into
foundation footings.
Radon mitigation in Pine.
Morrison — Jefferson County
Average radon level: 8.7 pCi/L (2.2x the EPA action level). High
risk. Morrison foothill properties sit directly above
uranium-bearing bedrock layers that release radon upward.
Radon mitigation in Morrison.
Kittredge — Jefferson County
Average radon level: 10.8 pCi/L (2.7x the EPA action level). Extreme
risk. Kittredge homes along Bear Creek Canyon experience significant
soil gas build-up, especially during winter months.
Radon mitigation in Kittredge.
Littleton — Arapahoe / Jefferson County
Average radon level: 6.4 pCi/L (1.6x the EPA action level). High
risk. Littleton's alluvial gravel and clay soils facilitate
widespread soil gas movement under thousands of basements.
Radon mitigation in Littleton.
Golden — Jefferson County
Average radon level: 7.9 pCi/L (2.0x the EPA action level). High
risk. Golden homes at the base of the Front Range frequently exceed
safe indoor air standards due to Table Mountain basalt and granitic
soils.
Radon mitigation in Golden.
Englewood — Arapahoe County
Average radon level: 5.9 pCi/L (1.5x the EPA action level). High
risk. Englewood properties experience elevated soil gas intrusion
through slab cracks and sump basins.
Radon mitigation in Englewood.
Idaho Springs — Clear Creek County
Average radon level: 12.1 pCi/L (3.0x the EPA action level). Extreme
risk. Idaho Springs' historic mining geology and fractured granite
yield exceptionally high radon readings.
Radon mitigation in Idaho Springs.
Fort Collins — Larimer County (extended service area)
Average radon level: 5.2 pCi/L (1.3x the EPA action level). High
risk. Fort Collins homes sit on alluvial deposits from the Cache la
Poudre River that create permeable soil pathways for radon entry.
Radon mitigation in Fort Collins.
Colorado Springs — El Paso County (extended service area)
Average radon level: 6.8 pCi/L (1.7x the EPA action level). High
risk. Colorado Springs sits on the Pikes Peak granite region,
creating subterranean radon pathways.
Radon mitigation in Colorado Springs.
Full service-territory overview:
All Phase Radon service areas.
Frequently Asked Questions
What is radon gas?
Radon is a naturally occurring radioactive gas produced by the
breakdown of uranium in soil, rock, and water. It is colorless,
odorless, and tasteless, and can seep into homes through foundation
cracks and gaps. Long-term exposure to elevated radon is the second
leading cause of lung cancer after smoking.
What is a radon mitigation system?
A radon mitigation system is a permanently installed assembly —
typically PVC piping plus an in-line fan — that draws radon gas from
beneath a home's foundation and vents it above the roofline before
it can enter living spaces. The most effective method is Active Soil
Depressurization (ASD).
How does a radon mitigation system work?
The fan creates negative pressure (suction) under the foundation,
collecting radon gas from the soil before it enters the home. The
gas travels up the PVC pipe and is exhausted above the roofline,
where it is diluted harmlessly by outdoor air. A manometer (U-tube
gauge) on the pipe lets you confirm the system is maintaining
suction.
Does radon mitigation really work?
Yes. A properly designed and installed ASD system is the EPA's
recommended method for reducing indoor radon. When correctly sized
to the home's foundation and soil conditions, a mitigation system
typically brings radon levels well below the 4.0 pCi/L EPA action
level — All Phase Radon guarantees below 3.9 pCi/L.
How long does a radon mitigation system take to work?
A mitigation system begins reducing radon immediately once the fan
is running. We recommend re-testing 24 hours to a few days after
installation to confirm levels have dropped, giving the system time
to establish steady negative pressure.
How long does a radon mitigation system last?
The PVC piping and routing last the life of the home. The fan is the
component that wears out — typically lasting 5–10 years depending on
usage and conditions. When a fan fails, it can be replaced without
redoing the whole system. We back our installations with a 20-year
transferable warranty.
How much does radon mitigation cost in Colorado?
A full new ASD mitigation system installation ranges from $1,399 to
$1,699 depending on foundation type, square footage, the number of
suction points required, and system accessibility. Radon fan
replacement starts at $549. We provide free, detailed estimates.
Final cost factors: home configuration, crawlspace vs. basement,
existing system condition, and whether repair or full installation
is needed.
What is a passive radon system vs. an active system?
A passive system is PVC piping installed during construction with no
fan — it relies on natural air flow and stack effect alone. An
active system adds an in-line fan to create real suction. Passive
systems often cannot reduce radon enough on their own, so many
homeowners convert passive to active by adding a certified fan.
How can I tell if my radon mitigation system is working?
Check the manometer (the U-tube gauge on the pipe): the liquid
levels should be uneven, indicating suction is present. If both
sides are level, the fan may have stopped or lost pressure. Also
listen for the fan running quietly and watch for unusual noise or
vibration. The most reliable confirmation is a follow-up radon test.
When does a radon system need repair?
Signs include a zero manometer reading, a silent fan, unusual noise
or vibration, a hot fan housing, or indoor radon levels climbing
back above the action level. Most issues — fan failure, pipe cracks,
seal leaks, sump lid problems — can be repaired without replacing
the entire system.
What does a radon mitigation system look like outside?
From the exterior you'll see a PVC vent pipe extending from the
foundation up past the roofline, with the in-line fan housed either
in the attic or outside. We design routing to be as unobtrusive as
possible and matched to the home's layout.
What are acceptable radon levels in Colorado?
The EPA action level is 4.0 pCi/L; the World Health Organization
recommends mitigation at 2.7 pCi/L. There is no truly "safe" level
of radon, so the goal is to reduce it as low as reasonably
achievable. All Phase Radon guarantees results at or below 3.9
pCi/L.
Does All Phase Radon do radon testing?
No. All Phase Radon specializes in radon mitigation only —
installing, repairing, and converting systems. Radon testing
(short-term or continuous monitor) can be done with a homeowner test
kit or by a separate testing professional; we recommend every
homeowner test so they know whether mitigation is needed.
See the full FAQ and resource library:
Radon FAQ and
Radon resources & guides.
Why Choose All Phase Radon
-
NRPP & Colorado State certified radon mitigation specialists
-
Locally owned and operated in Pine, Colorado — not a national
chain
- Owner Ryan Tereshko personally oversees every installation
- 20-year transferable warranty on every system
- 100% success rate — 1,500+ systems installed since 2019
- Guaranteed results at or below 3.9 pCi/L
- Free, no-obligation estimates
Contact All Phase Radon
Ready for a free estimate? Call
(720) 737-8627 or request a quote
online. We serve Denver, Evergreen, Bailey, Conifer, Pine, Morrison,
Kittredge, Littleton, Golden, Englewood, Idaho Springs, Fort
Collins, and Colorado Springs, Colorado.
Request a free estimate ·
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