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Radon mitigation proposal before installation checklist

A pre-contract radon mitigation checklist for confirming valid elevated test results, selecting a qualified professional under state and private credentialing requirements, documenting foundation and crawlspace conditions, choosing a pressure-field and vent strategy, locating fan, piping, discharge, electrical supply, warning device and sealing work, coordinating roof and fire assemblies, defining post-installation testing and owner records, and comparing bids before penetrations or equipment installation begins.

6 items to check

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The mitigation decision is based on valid test location, conditions, results and any required confirmation

Critical item

System design should not begin from an unreliable or irrelevant measurement.

Installer credentials, state requirements, insurance and references are verified

Critical item

Many states regulate radon professionals and qualified practice should be documented.

Foundation, slab, sump, drain tile, crawlspace, additions and pressure-field diagnostics support the proposed method

Critical item

The proposal should reflect actual soil-gas pathways and building zones.

Pipe, fan, discharge, warning device and electrical layout are safe, maintainable and acceptable to the owner

Critical item

Components should follow applicable clearances, routing and manufacturer requirements.

Sealing, crawlspace membrane, sump treatment and penetrations are coordinated without harming drainage or assemblies

Critical item

Sealing supports pressure control but should not be promised as the sole mitigation method.

Price, permit, diagnostics, electrical, testing, performance commitment, warranty, maintenance and records are explicit

Critical item

Bids should be compared on equivalent scope and defined acceptance.

Use after reliable testing indicates mitigation is appropriate and before installation. EPA generally favors methods that prevent radon entry, while exact design and credential rules vary by state and building. 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, state radon program and applicable consensus standards

    • 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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