CALIFORNIA
The Radon Report Card: Risk and Response
Population and Lung Cancer      Total Population: 39,461,588
Lung Cancer Deaths:
11,078
Age-Adjusted Lung Cancer Incidence Rate
(per 100,000) 37
Lung Cancer Cases
16,409
Radon-Induced Lung Cancer Cases
  1,117
  * Medical Costs (hospital, medicine, doctors)
  $225,000,000
  * Economic Costs (lost wages / productivity)
  $236,000,000

Buildings and Exposure Potential
Pre-Mitigation Radon Tests: 9,415
Percent by Radon Level  
 
  < 2 pCi/L

 
  ≥ 2 to < 4 pCi/L

 
  ≥ 4 pCi/L

Housing Units by Structure Type
1 to 4 Units 5 or More Units Total
Existing 10,826,136 3,334,679 14,160,815
New 62,745 47,452 110,197
Public Schools: 10,327

EPA and ANSI-AARST Radon Measurement Standards recommend fixing a building with a radon level ≥ (above or equal to) 4 pCi/L and consider fixing it if any radon level is ≥ 2 and < (below) 4 pCi/L.
Statewide Radon Policies
Credential Required Private Certification
Radon Standards in Effect ANSI-AARST
Homebuyer Protection Required Disclosure Only
Radon System Requirement for New Homes No
    Type of New Home Where Required N/A
    Standard/Code for Radon System in New Homes N/A
School Testing Required No
Radon System Requirement for New Schools No