The paper considers how primary care trusts (PCTs), which are relatively new organisations in the UK health service, might respond to the health hazards associated with radon in domestic properties. To this end, the cost-effectiveness of radon remediation programmes in four primary care trusts is calculated and compared with those of other interventions that can avert and treat lung cancer. The results suggest remediation programmes in the primary care trusts are cost-effective on various criteria. Policy recommendations that follow for the primary care trusts include encouraging remediation among their populations and identifying those most at risk from radon's effects.