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Radon mitigation post-installation retest and handover checklist

A radon mitigation closeout checklist for confirming continuous fan and warning-device operation, completing a valid post-mitigation radon test under the applicable timing and placement protocol, evaluating results against the agreed target without claiming zero risk, correcting inadequate performance, checking noise, vibration, condensate and building interactions, delivering system drawings, diagnostics, warranties and maintenance instructions, and planning future retesting before final payment.

6 items to check

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Fan, warning device, pressure indicator and electrical supply operate continuously and visibly

Critical item

The owner should be able to detect loss of system operation.

Post-mitigation testing uses a valid device, location, timing and operating conditions

Critical item

Acceptance should rely on a representative test after system stabilization.

Results are compared with the contract target and EPA guidance without describing any result as zero risk

Critical item

Failed or marginal performance should trigger diagnosis rather than unsupported reassurance.

Inadequate performance, leaks, noise, vibration, condensate or combustion concerns are corrected and retested

Critical item

The contractor should complete the agreed performance response.

The owner receives route drawings, fan data, diagnostics, test results, warranties and maintenance instructions

Critical item

Future owners and service technicians should understand the system.

A future retesting and inspection plan is documented, including after major building or HVAC changes

Critical item

System performance should be checked over time.

Use after the system has operated for the required stabilization period and before final acceptance. EPA recommends maintaining warning devices and periodic retesting; state or professional standards may set additional timing and documentation. Stop work when suspect hazardous material, uncontrolled dust, sewage, extensive mold, unsafe structure, damaged containment, exposed energized work or an unplanned release is found. Homeowners should not collect asbestos samples, disturb suspect materials, enter regulated containments or perform specialist clearance testing unless properly qualified and permitted.

Reference standards

  • Current EPA lead, asbestos, mold and radon guidance; applicable federal, state, tribal and local environmental, occupational, licensing, disposal, permit and notification requirements; the signed remediation scope; laboratory and field reports; building and mechanical requirements; and exact containment, filtration, cleaning, disposal, mitigation-system and product instructions
  • EPA Consumer’s Guide to Radon Reduction and current EPA maintenance and retesting guidance

    • Tools

  • Building-age and renovation records, environmental reports, laboratory results, contractor credentials, scope, permits, notifications, waste records, photographs and occupant-protection plan
  • Camera, flashlight, tape measure and owner-safe observation tools; specialist sampling, pressure monitoring, moisture instruments, clearance testing and radon devices where required
  • Qualified lead, asbestos, mold, industrial-hygiene, radon, mechanical, electrical, laboratory and medical professionals as appropriate

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