Real Estate Radon Measurement

Real Estate Radon Measurement

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Real Estate Radon Measurement

🏠 Real Estate RADON Screening Process (CARST Guideline)

Step	Action	Condition	Result	Next Step
1️⃣Perform RADON Screening Test	minimum 4-day test
2️⃣Interpret Results	Compare with guideline thresholds.	“Green”, “Yellow”, or “Red” result	Follow corresponding action below.
	🟢 Green Result	≤ 75 Bq/m³ (heating season) or ≤ 50 Bq/m³ (non-heating season)	Sale proceeds normally.	Perform a long-term test after move-in.
	🟡 Yellow Result	> 75/50 Bq/m³ and ≤ 400 Bq/m³	Include possible mitigation allowances in the purchase agreement.	Buyer conducts a long-term test
	🔴 Red Result	> 400 Bq/m³	Negotiate cost for mitigation system	Mitigation completed within 12 months;
3️⃣Long-Term Confirmation	Buyer performs long-term test after occupancy.	≤ 200 Bq/m³ → Safe > 200 Bq/m³ → Mitigate.	Re-test every 3 years.

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Real Estate Radon Measurement Process Chart