Radon Mitigation Calculator

Estimate post-mitigation radon levels, system costs, and health risk reduction for different mitigation approaches.

Current Radon Level (pCi/L)

Basement / Foundation Area (sq ft)

Foundation Type

Mitigation System Type

Tab to move between fields

Post-Mitigation Radon (pCi/L)

0.63

Reduction (%)89.5%

System Cost Estimate ($)$1,300.00

Risk Reduction (per 1,000/yr)0.43

Below EPA Level (1=Yes, 0=No)1

Below WHO Level (1=Yes, 0=No)1

How to Use This Calculator

Enter Current Radon Level (pCi/L), Basement / Foundation Area (sq ft), and Foundation Type.
Set Mitigation System Type.
Review the Post-Mitigation Radon (pCi/L) result.
Use Reduction (%) (%) and System Cost Estimate ($) ($) to inform your decision.

How the result changes with Current Radon Level (pCi/L)

Current Radon Level (pCi/L): Current measured radon level. EPA action level is 4 pCi/L; average US indoor is ~1.3 pCi/L.
Basement / Foundation Area (sq ft): Area of the lowest level of the home in square feet.
Foundation Type: 1 = Basement, 2 = Crawl space, 3 = Slab-on-grade, 4 = Pier/post (elevated).
Mitigation System Type: 1 = Active Soil Depressurization (best), 2 = Sub-membrane, 3 = HRV, 4 = Crack sealing only.

Post-Mitigation Radon (pCi/L): Estimated radon level after mitigation system installation.
Reduction (%): Percentage reduction in radon levels from the selected system.
System Cost Estimate ($): Approximate installation cost based on system type and area.
Risk Reduction (per 1,000/yr): Annual excess lung cancer risk reduction per 1,000 people (EPA linear no-threshold model).
Below EPA Level (1=Yes, 0=No): Whether post-mitigation radon is below the EPA's 4 pCi/L action level.
Below WHO Level (1=Yes, 0=No): Whether post-mitigation radon is below the WHO's 2.7 pCi/L reference level.

Identify Input Parameters
4 parameters
Current Radon Level (pCi/L) = 6, Basement / Foundation Area (sq ft) = 1000, Foundation Type = 1, Mitigation System Type = 1 = 4 input(s) provided
Calculate Post-Mitigation Radon
Post-Mitigation Radon = currentRadon * (1 - typicalEfficiency)
0.63 = 0.63
Calculate Reduction
Reduction = typicalEfficiency * 100
89.5 = 89.5%
Calculate System Cost Estimate
System Cost Estimate = system.baseCost + system.costPerSqFt * basementArea
1300 = $1,300