At a regional level lead non-compliance varies significantly with property age reaching a peak for properties built between 1919 and 1944 and then dropping dramatically. Figure supports the view that the trend is a reflection of the changing preference for utilising lead service pipes. The large reduction of risk post 1944 is consistent with a small national survey carried out by the Department of Environment (Department of the Environment 1977) suggesting that the observed trend may have wider relevance. Supplying customers with information about the likelihood of there being a lead service pipe in their property could encourage customers to take further action. Property age information could provide a useful input into any inferencing programme for lead risk which could help with target lead pipe replacement. However, the analysis shows that local factors (e.g., bylaws) also play a substantial role and would need to be identified if this approach is applied at a more local level.