Residential Lead Paint Contamination Review

This technical report presents a review of the potential for soil contamination due to lead-based paint in residential buildings, as requested by the Dunedin City Council. The report outlines the historical context of lead in paints sold in New Zealand, detailing regulations that have been implemented since 1957 to limit lead content. It describes the persistence of lead as a pollutant and its implications for soil contamination, particularly in areas close to older residential properties. The report summarizes key findings from various studies on lead concentrations in soils surrounding residential buildings, noting that properties built prior to 1945 exhibit significantly higher lead levels. It also identifies factors influencing lead concentrations in residential soils, such as ground cover and soil disturbance. The report concludes with recommendations for assessing lead contamination and guidelines for consent requirements related to hazardous activities and industries.