Last updated 2026-08-18
TL;DR
Colorado has no state radon contractor license, but anyone doing paid radon mitigation must hold current NRPP or NEHA certification under Colorado Board of Health rules. Certification renews every two years, requires 16 continuing education hours, and costs roughly $125 to $200 in renewal fees. Mitigation jobs in Colorado typically run $800 to $2,500 depending on foundation type.
Do you need a license for radon mitigation in Colorado?
Colorado does not issue a state radon contractor license. It requires something else: anyone performing radon mitigation for compensation has to hold current certification from either the National Radon Proficiency Program (NRPP) or the National Environmental Health Association (NEHA). The Colorado Department of Public Health and Environment (CDPHE) adopted this framework under 6 CCR 1009-6, the Colorado Radon Program rules. [1]
So you're not renewing a state license. You're renewing a third-party certification that the state recognizes as proof of competency. The practical difference is small. Let your NRPP or NEHA cert lapse and keep doing paid mitigation in Colorado, and you're out of compliance. Period.
The two certifying bodies run different exam structures and renewal schedules, but both satisfy Colorado's rule. NRPP is the more widely held credential among Colorado mitigators. NEHA certification is equally valid. Check CDPHE's current approved certification list before assuming a newer organization qualifies, because that list changes. [1]
Here's a detail people miss. Even if you only do mitigation as a subcontractor for a larger company, you still need your own individual certification. The credential belongs to the person doing the work, not the business entity.
How does Colorado's certification renewal work?
NRPP certifications run on a two-year cycle. Your renewal window opens roughly 90 days before expiration, and NRPP emails reminders. Renewal takes 16 hours of continuing education (CEUs) completed during the certification period, plus the fee. NRPP splits those 16 hours into categories: at least 8 hours in radon-specific technical topics, and the rest in business, safety, or related technical areas. [2]
NEHA's Registered Radon Mitigator (RRM) credential also renews every two years and requires 16 continuing education credits. Same idea, different portal. [3]
Let a certification lapse and both NRPP and NEHA have reinstatement paths, but they cost more and take more paperwork than a clean renewal. Don't let it lapse. Set a calendar reminder the day you pass your initial exam.
Colorado adds no separate state renewal form and no state fee on top of what NRPP or NEHA charges. Your renewal happens entirely with the certifying body. Once it's done, your updated certificate is your proof of compliance for any job site inspection or contract requirement.
What are the CEU requirements for renewal?
The 16-hour CEU requirement for both NRPP and NEHA is the real work at renewal time. Here's how NRPP's current guidelines break the hours down:
| CEU Category | Required Hours |
|---|---|
| Radon-specific technical (mitigation methods, diagnostics) | 8 minimum |
| General technical or safety (IAQ, building science, fall protection) | up to 4 |
| Business or professional development | up to 4 |
| Total required | 16 |
NRPP maintains a list of approved providers. The American Association of Radon Scientists and Technologists (AARST) runs some of the most widely available courses, including live webinars and in-person workshops. [4] State radon conferences, NRPP-approved online modules, and courses at trade events all count, as long as the provider is on NRPP's approved list at the time you take the course.
Been sitting on credit hours from a conference you attended 18 months ago and never logged them? Log them now. NRPP requires CEUs earned during the active certification period, and they audit this. Courses taken before your current cert period started do not count toward this renewal.
Want to clear your continuing education in one shot? AARST's annual symposium usually offers enough credit to meet the full 16-hour requirement in a single event. Confirm current offerings with AARST, since approved-hour counts vary by year.
How much does radon mitigation cost in Colorado?
For homeowners: radon mitigation in Colorado runs roughly $800 to $2,500 for a standard sub-slab depressurization system. The EPA puts the national average at $800 to $2,500, and Colorado pricing tracks close to the middle of that. [5] Three things drive the variation: foundation type, the number of suction points needed, and whether the contractor has to route pipe through finished living space.
Slab-on-grade homes with simple soil conditions land on the lower end. Homes with multiple foundation types, crawl spaces, or complicated drainage push toward the top. Post-mitigation testing, which you should always do, adds roughly $25 to $150 depending on a short-term or long-term kit.
For contractors: staying certified costs less than most people expect. NRPP's renewal fee has historically run $125 to $200, though fees change, so confirm the current amount with NRPP directly. [2] Add CEU course costs, which swing wide. A free CDPHE webinar costs nothing. A full AARST symposium with travel might run $500 to $1,200. The CEU cost is the real variable, not the renewal fee.
Colorado charges no state filing fee on top of NRPP's or NEHA's renewal. That's a genuine advantage over states that stack a state license renewal on top of national certification costs.
How long does radon mitigation take in Colorado?
Installing a sub-slab depressurization (SSD) system, the standard fix for most Colorado homes, takes one day. Usually four to six hours for a single-suction-point job. Complex work with multiple suction points, long pipe runs, or crawl space components can stretch to a full eight-hour day or need a second visit.
After installation, you wait before testing. The EPA recommends waiting at least 24 hours after installation before running a short-term test, ideally 24 to 48 hours to let the system reach steady state. [5] A short-term test then runs 48 to 96 hours minimum. A long-term test runs 90 days or more. Most Colorado homeowners use a 48-to-96-hour short-term test for the post-mitigation check.
So the honest timeline from booking to confirmed results is: one day of installation, two to four days of testing, one to two days for lab results. Call it one to two weeks from first contact to knowing whether your system works.
Geology matters here. The Front Range sits over uranium-bearing granites and sedimentary deposits that produce elevated radon across much of the state. CDPHE data show a high share of Colorado homes testing above the 4 pCi/L action level, which is why the mitigation industry here is busy and well-developed compared to lower-risk states. [6]
What does Colorado's radon regulatory framework actually say?
The governing document is 6 CCR 1009-6, adopted under the Colorado Board of Health. [1] That rule requires radon mitigation professionals working for compensation to hold current certification from an NRPP- or NEHA-approved program. CDPHE administers the state radon program and publishes a list of certified professionals that consumers can search to verify a contractor.
The statutory authority for the radon program lives in Title 25 of the Colorado Revised Statutes under the public health provisions, but the operational detail sits in the CCR rule, not the statute. [7] The statute sets the authority. The rule sets the actual certification requirement.
Colorado has no state radon contractor bond, no state liability insurance minimum specific to radon, and no state continuing education approval process separate from NRPP's or NEHA's. The state delegates the competency standard to those two national bodies. That keeps the state's administrative burden low and keeps the requirement consistent with national practice.
Work in more than one state? Each handles this differently. See how Arizona structures its requirements if you're considering multi-state operation, since Arizona has its own wrinkles. See Idaho's setup too, a similarly NRPP-reliant framework worth comparing.
What happens if your certification lapses in Colorado?
Let your NRPP or NEHA certification expire and keep doing paid mitigation, and you're in violation of 6 CCR 1009-6. CDPHE can investigate complaints and take enforcement action, including fines. Enforcement risk varies. The legal exposure is real.
On the certification side, both NRPP and NEHA handle lapses similarly. Within a short window after expiration (typically 30 to 90 days, check current policy with each body), you can often renew with a late fee instead of starting over. Past that window, you may have to retake the exam. That costs far more time and money than a late renewal fee.
A lapsed cert also creates business problems beyond the regulatory risk. Homeowners increasingly check the CDPHE directory before hiring. Real estate transactions routinely require proof of certification. If your cert reads expired in the lookup, you lose the job.
The simplest system: renew 60 days before expiration, every time. Confirm your CEUs are logged before you start the application. NRPP's online portal shows your earned credits, so you can audit your own standing any time.
How do NRPP and NEHA renewal processes compare?
Both satisfy Colorado's rule, so this mostly comes down to which organization you already hold. Switching between them isn't impossible, but it isn't a simple transfer either, so most Colorado mitigators stay with the cert they started with.
| Factor | NRPP | NEHA (RRM) |
|---|---|---|
| Cert cycle | 2 years | 2 years |
| CEUs required | 16 hours | 16 credits |
| Renewal fee (confirm current) | ~$125-$200 | ~$100-$175 |
| Portal for renewal | nrpp.org | neha.org |
| Colorado acceptance | Yes | Yes |
| Initial exam required | Yes | Yes |
NRPP has historically had more approved course providers in the Mountain West, which makes finding qualifying CEUs a bit easier in Colorado. NEHA's network runs stronger in some other regions. Neither is a bad choice. If you're starting fresh in Colorado, NRPP is what most of your peers hold.
Work in states that layer their own requirements on top? The national cert is still the foundation. Illinois structures its radon contractor requirements differently from Colorado, so if you operate across state lines, verify each state's current rules independently.
Where can Colorado mitigators find approved CEU courses?
The most reliable sources for NRPP-approved continuing education in Colorado are a short list.
AARST (the American Association of Radon Scientists and Technologists) runs an annual national symposium and periodic webinars. The symposium usually offers 10 to 16 approved CEU hours in one event. [4]
CDPHE periodically offers free or low-cost radon training webinars for Colorado professionals. Watch for these. The price is right, and they often cover Colorado-specific regulatory updates that matter for your practice. Check CDPHE's radon program page for the current calendar. [6]
NRPP's own website keeps a searchable, updated approved course provider list. Use it rather than assuming a course you've heard about qualifies.
Online options have grown a lot since 2020. Multiple NRPP-approved providers now offer fully online CEU courses you can finish on your own schedule. Quality varies. Look for courses with real diagnostics content, more than regulatory overview, since the technical hours are the harder requirement to fill.
Just getting your paperwork organized for the first time and want a single kit that walks you through certification? RadonPath's $149 NRPP Mitigation Kit at /start puts the application materials in one place. That's for initial certification. Renewal goes directly through NRPP's or NEHA's portal.
What's Colorado's radon context, and why does it matter for mitigators?
Colorado is a high-radon state by geology and housing stock. CDPHE estimates roughly 50% of Colorado homes have radon at or above 4 pCi/L, the EPA's action level. [6] The national average sits near 13%, so Colorado's elevated baseline is real.
The EPA action level of 4 pCi/L is the threshold at which the agency recommends mitigation. EPA has discussed lowering that to 2 pCi/L in future guidance, though no formal rule change has been adopted as of this writing. [5]
For a mitigator, this makes Colorado a strong market. The demand is there. The catch is that homeowners in metro Denver and along the Front Range are increasingly educated about radon and price-shop carefully. Certification status, professionalism, and clean post-mitigation results matter more here than in states where awareness runs low.
Altitude and climate add another wrinkle. House pressures and soil conditions behave differently than at sea level. Tighter cold-weather envelopes and the seasonal stack effect can push Colorado homes to higher indoor radon in winter. If you're doing post-mitigation testing, helping clients understand seasonal variation is part of the job.
For comparison, Florida's radon program has a different regulatory structure despite similarly high demand, and Connecticut's program requires a state-issued license rather than national certification alone. Colorado's approach is genuinely simpler.
Frequently asked questions
Do you need a license for radon mitigation in Colorado?
Colorado doesn't issue a state radon contractor license. Instead, 6 CCR 1009-6 requires anyone doing paid radon mitigation to hold current NRPP or NEHA certification. So yes, you need a credential, but it comes from a national certifying body rather than a state agency. CDPHE publishes a searchable directory of currently certified professionals in the state.
How often does radon mitigation certification renew in Colorado?
Every two years. Both NRPP and NEHA certifications run on two-year cycles. Colorado has no separate state renewal; your obligation is to keep your NRPP or NEHA cert current. Renewal requires 16 hours of continuing education completed during the certification period plus a fee paid to the certifying body.
How much does radon mitigation cost in Colorado?
Expect $800 to $2,500 for a standard sub-slab depressurization system in a Colorado home. That range matches EPA national estimates and reflects real Colorado contractor pricing. The main cost drivers are foundation complexity, number of suction points needed, and whether pipe has to route through finished space. Post-mitigation testing adds roughly $25 to $150.
How long does radon mitigation take in Colorado?
Installation usually takes four to six hours for a standard single-suction-point system, or a full day for complex jobs. Add two to four days for a post-mitigation short-term radon test, then one to two days for lab results. From contractor booking to confirmed results, plan on one to two weeks total.
What CEUs are required for NRPP renewal in Colorado?
NRPP requires 16 CEU hours per two-year certification period. At least 8 of those hours must be in radon-specific technical topics. The rest can come from general technical, safety, or professional development courses offered by NRPP-approved providers. AARST events and CDPHE webinars are common sources for Colorado mitigators.
What happens if my radon certification lapses in Colorado?
Doing paid mitigation with a lapsed cert violates 6 CCR 1009-6 and exposes you to CDPHE enforcement action. On the certification side, a short lapse (typically under 90 days) usually means a late fee to renew. A longer lapse may require retaking the exam. You'll also drop off CDPHE's public directory, which can cost you real estate referral work.
Does Colorado require insurance for radon mitigators?
Colorado's radon rules do not set a minimum liability insurance requirement for radon mitigators beyond what general contractor law may require. That said, nearly all real estate transactions and homeowner contracts expect proof of general liability insurance. Carry it regardless. Confirm current state contractor insurance requirements with CDPHE or the Colorado Secretary of State's office.
Can I do radon mitigation in Colorado with just EPA certification?
The EPA does not certify individual radon contractors. EPA's Indoor Environments Division sets guidance; actual certification comes from NRPP or NEHA. Colorado's rules require one of those two credentials. There is no EPA certification card that satisfies Colorado's requirement on its own.
How do I verify a contractor is certified in Colorado?
CDPHE maintains a public directory of currently certified radon professionals. You can also verify directly through NRPP's certification lookup at nrpp.org or NEHA's member directory. For any paid mitigation job, the contractor should show you a current, unexpired certificate with their name and certification number on it.
Is Colorado a high-radon state?
Yes. CDPHE estimates roughly half of Colorado homes test at or above the EPA's 4 pCi/L action level. The state's uranium-bearing geology, particularly along the Front Range, produces elevated radon across large residential areas. Colorado's radon mitigation market is correspondingly active and competitive compared to lower-risk states.
Do I need separate certification for radon testing and radon mitigation in Colorado?
Yes. Radon measurement and radon mitigation are separate NRPP (and NEHA) credential categories. If you want to do both, you need both credentials. Many Colorado mitigators hold only the mitigation credential and refer testing to measurement specialists, or they hold both. The CEU and renewal requirements apply separately to each credential.
Where do I renew my NRPP radon mitigation certification?
Directly through NRPP's online portal at nrpp.org. The renewal application, CEU attestation, and fee payment all happen there. Colorado has no state-level renewal portal or state fee on top of NRPP's charge. Your renewed certificate is issued by NRPP, and CDPHE's directory updates based on NRPP's records.
Sources
- Colorado Department of Public Health and Environment, 6 CCR 1009-6 Radon Program Rules: Colorado requires that anyone performing radon mitigation for compensation hold current NRPP or NEHA certification under 6 CCR 1009-6
- National Environmental Health Association (NEHA): NEHA's Registered Radon Mitigator credential renews every two years and requires 16 continuing education credits
- American Association of Radon Scientists and Technologists (AARST): AARST runs NRPP-approved courses and annual symposiums offering CEU hours for radon professionals
- U.S. Environmental Protection Agency, Consumer's Guide to Radon Reduction (EPA 402/K-10/005): EPA estimates radon mitigation system installation costs $800 to $2,500 and recommends mitigation at or above 4 pCi/L action level
- Colorado Department of Public Health and Environment, Radon Program Overview: CDPHE estimates roughly 50% of Colorado homes test at or above the 4 pCi/L EPA action level, and CDPHE maintains a directory of certified radon professionals
- Colorado Revised Statutes Title 25, Public Health and Environment, Section 25-11-501 et seq.: Colorado statutory authority for the radon program and certification requirement is found in Title 25 of the Colorado Revised Statutes
- U.S. EPA, Radon-Resistant New Construction and Mitigation Standards: AARST-ANSI standards govern technical requirements for radon mitigation system installation, referenced by NRPP training and EPA guidance
- U.S. EPA, Map of Radon Zones (EPA 402-R-93-071): Colorado's Front Range counties are predominantly designated EPA Zone 1 (highest potential radon), supporting the state's elevated testing rates