Routine owner checks
Know the system’s normal indicator reading, listen for a new fan sound, look for visible pipe or membrane damage, keep discharge clear, retain labels, and follow manufacturer and installer documentation. Do not service energized or inaccessible components yourself.
Reasons to retest
EPA suggests future retesting even below 4 pCi/L and specifically notes changed use of a lower level. Also consider testing after mitigation, repair, major renovation, foundation or HVAC changes, or before a real-estate transaction.
When to request help
Contact an Iowa-credentialed mitigation specialist for system changes or suspected failure, and an appropriately certified measurement professional when a documented measurement is needed.
Primary sources
Claims checked August 2, 2026. Guidance can change; confirm the current source before acting.