Tacoma, located in Pierce County, sits atop geology that includes glacial till, sand, and gravel—soils that are known to emit radon gas as uranium decays. While the Pacific Northwest is often perceived as low-risk, the Washington State Department of Health maps show that Pierce County has moderate to high radon potential, particularly in homes built before 1990 and those with basements or crawl spaces. Tacoma’s older housing stock, much of it dating from the early 1900s through the 1950s, often lacks modern vapor barriers and sub-slab depressurization systems, creating a strong demand for testing.
Local awareness is growing thanks to real estate disclosure trends and health campaigns. Homebuyers in Tacoma increasingly request radon tests during inspections, and families with young children or elderly members are proactive about testing. The market is still developing—many homeowners remain unaware that radon is the second leading cause of lung cancer—which means an opportunity for an educated, trustworthy radon testing business to capture market share. Competition exists from national franchises and a handful of local home inspectors who offer testing as an add-on, but few specialize solely in radon measurement. By positioning yourself as Tacoma’s radon expert, you can build a referral-based business quickly.
Washington State does not require a specific license to perform radon testing. However, to maintain credibility and meet real estate industry standards, you should obtain voluntary certification from the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). These certifications require passing an exam, using approved devices, and following EPA protocols. Without certification, you risk losing clients who check credentials and may face liability if test results are questioned.
You must register your business with the Washington Secretary of State (choose a unique name). Then obtain a City of Tacoma Business License—this is mandatory for any entity operating within city limits, even if you travel to client homes. The annual fee is approximately $80–$120. Additionally, Pierce County requires a general business license if you operate outside Tacoma city limits (e.g., University Place, Fircrest). You will also need a Washington State Unified Business Identifier (UBI) number and register for sales tax with the Department of Revenue. Radon testing services are generally taxable as a service in Washington, so collect and remit 10.1% sales tax (Tacoma’s combined rate) on services provided within city limits.
Obtain general liability insurance ($1 million minimum) to protect against property damage claims during testing. Errors and omissions insurance is also wise. If you test for real estate transactions, be aware that Washington law does not mandate radon disclosure to buyers, but sellers must answer direct questions honestly. You can advise clients about best practices but avoid giving legal advice. Always provide a written report and follow EPA protocol (e.g., closed-house conditions for 12 hours prior).
Go to google.com/business and create a new profile. Select the category “Radon Testing Service.” If that is not listed, use “Environmental Testing Laboratory” or “Home Inspector” but adjust the description to clarify your radon focus. Since you travel to client homes in Tacoma, choose “Service Area Business” and list your service areas: Tacoma, University Place, Fircrest, Puyallup, Gig Harbor, Lakewood, Steilacoom, and Ruston. Do not display your home address publicly unless you have a dedicated office. Use a local Tacoma phone number (253 area code) to build trust.
Write a thorough business description that includes keywords like “radon testing Tacoma,” “radon measurement Tacoma WA,” and “EPA-certified radon tester.” Upload high-quality photos: your testing equipment, a typical Tacoma home exterior, and a photo of you conducting a test. Add services: Short-term (3–7 day) charcoal canister tests, continuous monitor tests, long-term (90+ day) tests, and mitigation referrals. Use the Q&A section to answer common local questions: “How much does radon testing cost in Tacoma?” and “Do you
Run a free GBP audit, analyze your competitors, and track your review growth — all in one platform.
Try BizLaunchIQ Free →