Effective radon testing & mitigation with TerraFirma

HUD Multifamily Radon Mitigation Services in Greater Portland

Designing effective radon reduction systems for multifamily buildings

Since 2005, TerraFirma has increased the safety and value of multifamily homes throughout Oregon and Washington. If you are applying for funding through the U.S. Department of Housing and Urban Development (HUD) for the purchase or refinancing of a multifamily property, you are required to include proof of radon testing and mitigation if elevated levels of radon gas are found.

If you have had your property tested and your radon level is 4 picocuries per liter (pCi/L) or higher, TerraFirma can install a radon reduction system to reduce radon levels in accordance with American Society for Testing and Materials (ASTM) standards and the HUD Radon Policy.

Call TerraFirma today to schedule your radon consultation. We offer radon testing and mitigation services for all multifamily dwellings, including condos, townhouses, and apartment buildings in Seattle, Eugene, Bend, Medford and surrounding areas.

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Authorized Dealer of National Radon Defense

Our Radon Mitigation Services

  • Retrofit & new construction mitigation services
  • Radon abatement system design & consulting
  • Active soil & sub-slab depressurization
  • Supervision of substantial rehabilitation projects
  • Activation of passive systems

HUD policy requires radon testing in multi-family properties.

Installing radon reduction systems in large buildings requires extensive knowledge of building codes and construction designs. Things like HVAC systems, stairwells, elevator shafts, and complex foundations must be considered. The most common radon mitigation system is Active Soil Depressurization, but we will work with you to determine the best radon reduction method for your property.

With experience designing radon mitigation systems for multi-unit buildings, you can count on TerraFirma for effective reduction of radon levels and peace of mind. Once mitigation is completed, we will provide you with a certificate of completion and ensure that follow-up testing is completed.

If you need to have your building tested, learn more about our HUD radon testing services and contact us today to schedule your test!

Contact us for a free radon mitigation quote

If your multifamily property has high radon levels, don’t wait to take action. We are the local trusted radon professional in Eugene, Bellevue, Vancouver, Hillsboro, Salem, Gresham, Renton and areas nearby. Contact us to get a free estimate to have a radon mitigation system installed.

Looking for a price? Get a no cost, no obligation free estimate.

our service area

We serve the following areas

  • Adams
  • Adrian
  • Arock
  • Athena
  • Baker City
  • Bates
  • Bridgeport
  • Brogan
  • Burns
  • Cove
  • Crane
  • Drewsey
  • Durkee
  • Elgin
  • Enterprise
  • Haines
  • Halfway
  • Harper
  • Helix
  • Hereford
  • Huntington
  • Imbler
  • Imnaha
  • Ironside
  • Jamieson
  • Jordan Valley
  • Joseph
  • Juntura
  • La Grande
  • Lostine
  • Meacham
  • Milton Freewater
  • North Powder
  • Nyssa
  • Ontario
  • Oxbow
  • Pendleton
  • Pilot Rock
  • Prairie City
  • Richland
  • Riverside
  • Summerville
  • Sumpter
  • Ukiah
  • Union
  • Unity
  • Vale
  • Wallowa
  • Westfall
  • Weston
Our Locations:

TerraFirma Foundation Systems
761 NE Garden Valley Blvd.
Roseburg, OR 97470
1-541-204-4660


TerraFirma Foundation Systems
13110 SW Wall St
Portland, OR 97223
1-541-229-4049


TerraFirma Foundation Systems
10111 S Tacoma Way D5
Tacoma, WA 98499
1-253-201-1447