California · 2026 pricing
Radon mitigation cost in California
A typical sub-slab system in an 1,800 sqft full-basement home at 6 pCi/L in California: $1,562–$4,605 · state cost factor 1.30×.
EPA radon zone summary: Zone 3 (low — < 2 pCi/L). Variable: Bay Area + Sierra foothills Zone 1; coast and south Zone 3.
Radon Mitigation Cost Calculator
Estimated cost
$1,113–$3,479
Typical: $2,087 · state factor 1.10×
Line items
- System — Sub-slab depressurization (most common)$2,087
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Estimates are educational — actual quotes from local pros may differ based on site conditions, permits, and seasonal demand.
Why California runs above the US average
Radon mitigation pricing in California reflects three regional factors: licensed HVAC / specialty trade wages (BLS), EPA Zone density (Zone-1 states have mature mitigator markets and competitive pricing), and state-specific permitting / disclosure requirements. The 1.30× factor is calibrated from 2025 AARST + HomeAdvisor regional rate data.